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No guarantees are made on the results, and anything you do yourself is
at your own risk.
Fuel Pump and Control Unit Failure Story
By Alora Duncan
============================================================================
Note: Photos were taken of every step below; but I do not know how
to post
these revealing photos to this forum.
----------------------------------------------------------------------------
0. One morning, my 1990 Infiniti Q45 (125K miles) wouldn't start:
The 4.5 liter 8-cylinder engine cranked wonderfully, but would not
catch.
It wasn't the starter motor nor the battery (as it rotated
perfectly).
As always, it had to be either gas, air, spark, compression, or
timing.
Following is an idealized path others can follow to debug & repair.
Note: My actual debug & repair path took three weeks and much trial
&
error; which is exactly why I wrote this howto for others to follow.
Note: Re-assembly, in all cases, is the reverse of the dis-assembly
procedures described below.
Note: This dozen-step diagnostic, removal, & replacement procedure
is
accompanied every step of the way with digital photos illustrating
every described action.
----------------------------------------------------------------------------
1. I ran a quick visual/audible gas, air, spark, compression &
timing
check:
GAS: The gas tank was completely full (filled the night
before).
The 15 amp fuel pump fuse was intact (replaced it anyway).
I could NOT hear the fuel pump humming (at any time).
AIR: The air intake & air filter were not clogged (left it
open).
SPARK: I did not know how to run a quick test for spark.
COMPRESSION: The engine did sound like cylinder wash (no
compression?).
TIMING: The camshaft rotated (looking in the oil-filler hole).
----------------------------------------------------------------------------
2. I soon realized no gasoline was being pumped INTO the fuel
filter:
- I removed the 15 amp fuel pump fuse (by the driver-side right
kneecap);
- I cranked the engine in order to release any residual fuel
pressure;
- I removed the two 10mm bolts holding the fuel filter clamp to the
body;
- I removed the two #2 phillips screws holding the fuel filter hoses
on;
- I replaced the 15 amp fuel pump fuse and cranked the engine again.
- No gasoline spurted out of the open fuel line hose.
Note: One clue was that, after an overnight sitting, with the fuel
filter
and activated carbon fuel cannister still on the car, the engine
started for a split second. This happened for two mornings.
I suspect this momentary ignition was due to the burning of
fuel fumes collecting in the fuel system over long periods of time.
Note: I blew through my fuel filter and there was almost no
resistance;
so, despite the fact almost everyone says that a clogged fuel filter
can cause the fuel pump to overwork and therefore heat up and
therefore melt the solder connections on the fuel pump control unit,
I suspect a clogged fuel filter was not my problem.
----------------------------------------------------------------------------
3. I studied the 1990 Q45 fuel system electrical & hydraulic
circuits:
ELECTRICAL:
- Battery voltage goes to the fuel pump relay ...
- to the fuel pump (in the gas tank) ...
- to the fuel pump control unit (under the rear sundeck platform)
...
- which provides three resistive paths (fuel pump speeds) to ground
...
- based on input from the engine control unit (passenger side dash).
HYDRAULIC:
- Fuel is pumped out of the fuel tank ...
- to the inlet of the fuel filter ...
- to the fuel line & fuel plenum ...
- to each of the 8 fuel injectors (which open at the same time) ...
- with pressure regulated by the 43 psi fuel pressure regulator ...
- which sends unspent fuel back to the fuel tank for recovery ...
- and which allows fuel vapors to be trapped in the carbon cannister.
INTERNET:
- Factory shop manual & technical service bulletins & recall
notices:
http://www.nissan-techinfo.com/infiniti
- Infiniti mechanics and afficianados on line to help you:
http://forums.nicoclub.com
http://groups.yahoo.com/group/infinitiownersclub).
- Basic USENET newsgroups (not much help compared to the above):
http://groups.google.com/groups?group=alt.autos.infiniti.q45
http://groups.google.com/groups?group=alt.autos.nissan
http://groups.google.com/groups?group=rec.autos.tech
- New parts:
http://www.infinitipartsusa.com
Fuel Pump Control Unit: $379.05 + sh &
tax
Fuel Pump (includes the fuel pump 0-ring): $234.99 + sh & tax
Fuel Injector: $142.71 + sh &
tax
Fuel Gauge Sending Unit: $ 97.38 + sh &
tax
Fuel Filter: : $ 10.49 + sh &
tax
Note: For some strange reason, searches on www.infinitipartsusa.com
locate the fuel pump control unit only as the "Fuel Modulator"
(nobody else uses that naming convention).
Fuel Modulator Q45 1990-1996 $379.05
- Used parts:
Fuel Pump: 1990 to 1996
Fuel Pump Control Unit: 1990 to 1996
Fuel Gauge Sending Unit: 1990 to 1996
LOCATIONS:
- The fuel tank is located in the center of the trunk room (between
the rear seat and the trunk).
- The fuel pump & fuel pump resistive gauge & filter sock is located
in
the top of the fuel tank.
- The fuel pump control unit is located on the underside of the rear
metal sundeck (near the rear passenger side speaker housing).
- The fuel pump relay (lime green) is located next to the antenna
and
fuel tank gasoline inlet in the area between the rear passenger side
fender and the rear passenger side trunk fiberboard lining.
- The fuel filter is located on the passenger side of the engine
compartment bolted to the inside of the passenger side fender wall.
ACCESS:
- Access the fuel pump, fuel pump relay, fuel pump control unit, &
the
related fuel system harnesses for test from the rear trunk area.
- Access the fuel pump for removal & replacement either by removing
the
rear seat & sundeck & storage binnacle or by dropping the fuel tank
(rear seat removal access is preferred over tank removal by most).
TERMINOLOGY (don't get these mixed up):
- The harness connector (white, female) to the fuel pump control
unit
is called the fuel pump control unit harness connector.
- The harness connector (green) to the fuel pump relay is called the
fuel pump relay harness connector.
- The harness connector (blue, female) to the fuel pump is called
the
fuel pump harness connector.
Likewise:
- The connector (white, male) on the fuel pump control unit
is called the fuel pump control unit connector.
- The connector (green) on the fuel pump relay is called the
fuel pump relay.
- The connector (blue, male) to the fuel pump is called the fuel
pump
connector.
TOOLS:
- Two #2 phillips screwdrivers (one six inch, & 1 two-inch stubby).
- One thin flathead screwdriver (for prying plastic butterfly
clips).
- Two box wrenches (one 8 mm box & one 10mm) for bracket bolts.
- One 19 mm open-end wrench (for the gas tank fuel line lock nuts).
- One 16 AWG wire, about a foot long, with an alligator clip on each
end.
- One volt-ohm-amp-meter (Fluke 77 or equivalent) with alligator
clips.
- One needle-nose or standard pliars (for spring-closed hose
clamps).
- One paring knife (or similar) for removal of sound-proofing
material.
----------------------------------------------------------------------------
4. The fuel pump relay checked out OK for proper operation under
load:
FROM THE TRUNK:
- I removed the trunk room fiberboard bulkhead (between the rear
seat
back & the trunk) by removing the 7 black #2 phillips screw-type
butterfly anchor clips holding the fiberboard bulkhead to the steel
supports.
- I removed the trunk passenger-side bulkhead (between the trunk and
the rear fender near the radio antenna & fuel filler opening) by
removing the 5 black #2 phillips screw-type butterfly anchor clips
from their supports.
- I removed the single 10mm bolt holding the two-pronged relay
bracket
which held a blue relay (courtesy lamp relay) on one prong and a
lime-green (fuel pump relay) relay on the other.
- I pulled the lime-green fuel pump relay off the bracket tang.
- I jumped 12 volts DC across pins #1 and #2 (hearing a sharp
click).
- The resistance fell (from infinity) as the actuator closed (to
zero).
Note: I also checked power to the fuel pump relay, continuity from
the
fuel pump relay to the fuel pump relay harness, continuity from
the fuel pump relay harness to the fuel pump harness, & continuity
from the fuel pump harness to the fuel pump control unit harness
(all as per the factory shop manual EF & EC-169); but, not
surprisingly, I'm told the fuel pump relay and these fuel electrical
system wires almost never go bad; so consider the entire diagnosis
procedure in the factory shop manual a severe case of over
diagnosis.
----------------------------------------------------------------------------
5. The old fuel pump passed the basic factory shop manual test:
FROM THE TRUNK:
- I disconnected the fuel pump harness connector (blue, in the trunk
room).
- As per the factory shop manual (EF & EC-185), I checked the
resistance
between the top-left and the top-right (tab on top, facing terminal
side)
of the six male terminals on this fuel pump connector.
- My resistance was 0.9 to 1.1 ohms which was inconclusive since the
factory shop manual merely states the resistance to be 0.5 ohms but
the factory shop manual does not supply a range value.
Note: It seems this factory shop manual test is almost useless.
When I tested the new fuel pump, it too tested about the same at
0.6 to 0.8 ohms. The online Infiniti mechanics noted the resistance
test merely checks one (of many) commutators. Online mechanics say
the clearest sign of a bad pump is audible HUMMING.
I must admit, the new pump barely made a sound, even when jumped
directly to ground providing it full battery voltage. I didn't
realize it at the time, but, the old pump actually hummed loudly.
(There is so much soundproofing that I never heard the old fuel
pump motor hum until the rear trunk room lay bare & exposed.)
Basic recommendation: If the fuel pump has 100K miles on it; or
if the fuel pump is humming at all audibly; then replace it
(before it burns out the ground wire on the fuel pump control unit).
Note: The two most basic tests should have been (in hindsight):
- Did the 1990 Infiniti Q45 have more than 100K miles?
- Did the 1990 Infiniti Q45 fuel pump have an audible hum?
If either answer were yes, then replace the '90 Q45 fuel pump.
----------------------------------------------------------------------------
6. The old fuel pump control unit failed the basic bypass test:
FROM THE ENGINE COMPARTMENT:
- I reconnected the fuel filter (passenger side of the engine
compartment).
FROM THE TRUNK:
- I reconnected the fuel pump harness connector (blue, in the trunk
room).
- I removed the fuel pump control unit harness connector (white,
female)
from the fuel pump control unit connector (white, male) mounted
directly
on the fuel pump control unit.
- Note: Nothing else was removed at this time; the fuel system was
otherwise completely intact.
- I filed an alligator clip's teeth so that it fit into the small
female
tab on the bottom left (terminal side, with the clip up) of the
white
fuel pump control unit harness connector.
- I connected the other side of the alligator-clip one foot long 16
AWG
wire to a convenient ground (expecting as much as 7.5 amps to 10
amps
based on 15-amp fusing).
- I turned the ignition to "ON" and listened for the fuel-pump
humming.
- It hummed for about 10 seconds after turning the ignition to ON.
- I started the 1990 Infiniti Q45; it ran like a charm.
- The current draw was about 5.8 amps on the old humming fuel pump.
- The engine starved approximately 2 seconds after disconnecting
this
fuel pump control unit bypass jumper.
Note: I drove the car for more than a week (about 200 miles) with
this
thin alligator clip shorting the fuel pump to ground bypassing the
three-position (slow@[EMAIL PROTECTED] to 5.7 volts, medium@[EMAIL
PROTECTED] to 8.1 volts, &
fast@[EMAIL PROTECTED]
to 14 volts battery voltage) fuel pump control unit settings.
Note: Online mechanics estimate the old fuel pump might last a few
weeks
(running full speed as it is when jumpered to ground); while a new
fuel pump may last a few months in this temporary full-power state.
Note: It is recommended the fuel tank be kept full whenever
operating the
Infiniti Q45 in this state as the fuel pump is cooled by the
gasoline in the fuel tank.
Note: This is NOT the procedure in the factory shop manual (EF &
EC-185).
This procedure is much simpler than that in the factory shop manual.
The procedure in the factory shop manual requires three test jigs,
of four, five, and then six wires between the white female fuel
pump control unit harness connector and the white male fuel pump
control unit connector. In most cases, this test is overkill.
----------------------------------------------------------------------------
7. Reconcile yourself to the fact you have a few hours of work to
perform:
Q: Why?
A: Because of these three basic facts.
FACT 1: The first fact is that the proper removal of the fuel pump
control unit is from the rear-seat direction & not from the
(otherwise more convenient) trunk-room direction.
FACT 2: The second fact is that experienced Infiniti Q45 mechanics
have concluded most fuel pump control unit failures are due
to the fuel pump itself beginning to fail (and thereby to
draw excessive current, which melts the weak solder joints on
the ground wire printed circuit board connection on the fuel
pump control unit).
FACT 3: Therefore, if you merely replace or re-solder the broken
fuel
pump control unit, you'll eventually burn out the new or newly
repaired (and much more expensive) fuel pump control unit.
The good news is the Infiniti mechanics online have reported very
few
(if any) failures of the repaired or replaced fuel pump control unit
once the fuel pump is replaced (for another 100K miles or so
anyway).
----------------------------------------------------------------------------
8. Remove the rear seats, rear sundeck shelf, and rear package
binnacle:
REMOVE REAR BENCH:
- Move the front seats forward as far as they will go and tilt the
front seat backs forward as far as they will go to obtain working
room.
- Locate the two black clip extensions on the rear seat floor area
and
pull out those two black clip extensions simultaneously pulling up
on
the leading edge of the rear seat bench to lift it upward and out.
The rear seat bench removal requires no bolts to be removed.
There are only four clips in the leading edge; and two clips in the
trailing edge of the rear seat bench to take into account for
removal.
- Scavenge the $1.35 (on average) in loose change under the rear
bench
that the federal government suggests wreckers earn per car on
wrecked
cars for tax-reporting reasons.
REMOVE REAR SEAT BACK:
- Pop out or pry out (with a thin flathead screwdriver) the four
blue
solid butterfly anchor clips from the leading edge of the rear
topside
sundeck where the sundeck overlaps with the rear seatback.
- Remove the two rear headrests by pressing the driver-side knob
under
each & simultaneously lifting upward until the posts clear the
seatback.
- Push down the rear seat armrest and pull back on the vertical
backing
which is velcroed to the steel bulkhead behind rear seat back.
- Remove the two #2 phillips screws behind this velcroed rear
armrest
compartment.
- Remove the four #2 phillips screws holding the U-brackets at the
bottom of the rear seat back.
- Pull up the rear seat back vertically, to clear three
reverse-u-shaped
wire brackets from their u-shaped metal brackets in the rear
bulkhead
metal wall. This should remove the seat (except for the seat belts).
- Pull out the two side rear seat shoulder belts as far as they will
go
and jam a pen or other object to eliminate the return tension.
The seat belts will be less of a nuisance if you perform this task.
- Flip the rear seat back (still attached by the seat belts) upside
down
so that the foam side is facing the front & the leather side is
facing
the rear and the headrest portion is on the floor of the automobile
(this provides maximum room to work, especially if you've already
moved the front seats as far forward as possible).
- Replace all screws loosly in their original holes so as not to
lose
any.
REMOVE REAR UPPER TAIL-LIGHT & REAR SUNDECK:
- After removing the three blue solid butterfly clips on the leading
edge of the rear sundeck ...
- Pull toward the front and upward on the rear upper tail-lamp
housing;
and disconnect the rear upper tail-lamp harness connector from the
rear
upper tail-lamp connector. Remove the rear tail lamp housing.
- Pull up on the rear sundeck everywhere you can to unclip the 11
solid
white anchor clips (4 equally spaced in the rear, two in the middle
on each side of the package binnacle, and 5 near the front of the
sundeck shelf, three of which are closely spaced near the middle
front
of the sundeck shelf and the other two nearer the outside edges).
- Collect all anchor clips in a zip-lock bag marked "rear shelf".
REMOVE REAR SUNDECK PACKAGE BINNACLE:
- With the rear upper tail-lamp & rear sundeck removed, unscrew the
seven #2 phillips screws holding down the black plastic rear sundeck
package binnacle (aka storage compartment basin).
Note: This rear sundeck black plastic storage binnacle is the key to
removing the fuel pump since the fuel pump (with the attached fuel
pump float, fuel pump housing, fuel pump level gauge, etc.), can
only come out undamaged through the rectangle left by the removal
of this rear sundeck storage binnacle (aka package binnacle).
Note: Almost none of this removal procedure is explained in the
factory
shop manual.
----------------------------------------------------------------------------
9. Remove fuel pump assembly from the top of the fuel tank from the
trunk:
FROM THE TRUNK:
- Disconnect the blue male fuel pump connector from the blue female
fuel pump harness connector.
- If you haven't done so already, bleed pressure out of the fuel
system
by cranking the engine with the fuel pump fuse (driver side dash, by
your kneecap) removed. Also remove the fuel tank inlet gas cap.
Have a large hotel towel handy because it's inevitable that fuel
will leak as you remove the fuel pump assembly from the fuel tank.
- With a 19mm open-end wrench, remove the two 19 mm tubing nuts
holding
the metal fuel pump outlet and vapor lines to the top of the fuel
pump
assembly. Be careful not to break the three-line plastic separator
(as I did) when bending the rigid metal fuel lines out of the way.
- With an 8mm box-wrench or a three-inch stubby #2 phillips
screwdriver,
remove the six 8mm bolts holding down the fuel tank assembly cover
plate to the fuel tank.
- Gently pull up on the fuel pump assembly taking care to prevent
the
six-inch black rubber O-ring from falling into the fuel tank.
- From the trunk, twisting gently as needed through the rear sundeck
shelf package binnacle opening, remove the fuel pump assembly.
- From the rear seat area, look down into the opening left by the
removal of the rear sundeck package binnacle and inspect the fuel
tank for debris (mine was as clean as a galvanized chambered
whistle).
----------------------------------------------------------------------------
10. Remove the fuel pump from the fuel pump assembly:
OUT OF THE CAR:
- Pull out the two one-inch brown plastic alignment clothes-pins
in the fuel pump wing bracket.
- Remove the two #2 phillips bolts bracing the fuel pump body to the
fuel pump assembly.
- Remove the one #2 phillips bolt holding the fuel filter sock to
the
metal fuel assembly (and push out the alignment tab).
- Remove the #2 phillips bolt attaching the power wire and the #2
phillips bolt attaching the ground wire to the fuel pump itself.
- Gently force the fuel pump motor black rubber wings out of their
braces in the fuel pump assembly leaving just the fuel hose
attached.
- Once the fuel pump wings are outside their slots, use pliars to
open the spring hose clamp on the plastic fuel pump outlet nipple.
- Remove the (now unattached) fuel pump from the fuel pump assembly.
- Compare the old fuel pump (in size & shape) to the new pump (the
two fuel pumps should match exactly).
- The replacement follows the reverse procedure.
Note: I purchased a new fuel pump from a parts store for $312.oo
while
the Infiniti dealership listed the fuel pump for $320. The
Infiniti dealership sold me the six-inch fuel pump O-ring for
$13.oo (all numbers include tax). I noticed, afterward, that
online, I could get the same pump (including the six-inch O-ring)
for $235 plus shipping & tax. Go Internet, if you have the time.
----------------------------------------------------------------------------
11. Remove the fuel pump control unit for replacement or repair:
FROM THE TRUNK:
- From the trunk, on your left side with your head facing the driver
side rear fender, with your right arm through the opening left by
the
removal of the rear sundeck package binnacle, place your index
finger
on the topside location of the bolt head for the two bolts holding
the
fuel pump control unit bracket to the underside of the rear sundeck.
- Have a partner mark the location of the two bolt heads (the actual
bolt
heads are buried under 1/8th inch thick rubberized soundproofing
material)
using whiteout or other suitable marking on the black gunky
material.
FROM THE REAR SEAT AREA:
- With a small paring knife, cut out the rubberized gunky black
sound-
proofing material on top of the two 10mm bolt heads.
- Use a 10mm box wrench to remove the two bolts holding the clamp on
the underside of the package shelf. Note that the clamp itself forms
a U, with one portion of the bracket above and one portion below the
metal horizontal sundeck shelf.
BACK IN THE TRUNK:
- Check that the fuel pump control unit (white, female) harness
connector
is disconnected from the fuel pump control unit (white, male)
connector.
- Remove the fuel pump control unit (with the bracket assembly
attached)
by pulling it toward the rear of the car, and downward.
----------------------------------------------------------------------------
12. Inspect, repair, or replace the fuel pump control unit:
OUT OF THE CAR:
- Remove the four #2 phillips head screws holding the top plate
(with bracket assembly) of the fuel pump control unit.
- Remove the four #2 phillips head screws holding the bottom plate
of the fuel pump control unit.
- Inspect the wiring everywhere; notice any charred or burned areas
(my ground wire on the bottom right (terminal side, tab on top) of
the
white male fuel pump control unit connector was charred a bit.
- Also, there was infinite resistance between that bottom-right male
terminal and the corresponding printed circuit board connection
(marked #4 on the PCB) on the underside of the printed circuit
board.
- I used a 25-watt soldering iron & a blue solder sucker to vacuum
up
the solder around that #4 pin and I re-soldered that ground pin.
- I also added a two-inch patch of 16AWG copper wire, soldered to
that
#4 pin and to all the connections on the printed circuit board I
could
identify as being that same ground connection.
- Test with a ohm meter that the resistance for that one ground lead
is near zero; and that accidental shorts to other traces did not
occur.
- Replace the now-repaired fuel pump control unit in the reverse
order
of removal.
Note: Do not power-up the fuel pump control unit out of the car as
the
holding bracket supplies the main ground for the fuel pump control
unit itself.
Note: The #4 terminal is the ONLY terminal on the male white fuel
pump
control unit connector which is surrounded by EMPTY pins in the
white female fuel pump control unit harness connector.
----------------------------------------------------------------------------
POST MORTEM:
THINGS I LEARNED THE HARD WAY:
- Basically, I should've replace the fuel pump at 100K miles!
Apparently they all eventually go bad. I should have also listened
for the now tell-tale hum (I never even noticed it before).
- Also, once before, about six months ago, my car would not start
for
about an hour; and then, all of a sudden, started. At the time, I
chalked it up to cylinder wash (loss of compression due to gasoline
washing the oil off the piston walls causing rings to temporarily
not
seal); but now I realize it was probably the fuel pump control unit
#4 pin solder heated up and, when it cooled, it re-connected itself.
- It was recommended we should fill up when just about on one
quarter
of a tank (or so). The (unsubstantiated) argument states that the
fuel
pump heats up, causing more current draw (how?) which causes the
solder
connection on the fuel pump control module ground circuit to heat up
which, if it melts, can cause the open circuit that I found in mine.
- You can diagnose everything from the trunk (after merely removing
just
the bulkhead between the rear seat back & the trunk); but you must
remove the seats, package shelf, and storage bin in order to remove
and replace either the fuel pump or the fuel pump control unit.
- The new six-inch fuel pump O-ring looked EXACTLY the same as the
old
one (condition was imperceptably different). So much, I ended up
mixing
the two accidentally, and I couldn't tell them apart. Be advised.
- The new pump made almost NO SOUND. I didn't even realize that
until
I had replaced it. Even with the full-power jumper bypassing the
fuel pump control, the new fuel pump hummed vastly less than the old
fuel pump hummed.
- The current draw and resistance measurements of the old fuel pump
and the new fuel pump were almost the same; so do not rely on these
figures as a diagnosis test (listen for hum or check your odometer):
OLD FUEL PUMP: NEW FUEL PUMP:
0.9 to 1.1 ohms 0.6 to 0.8 ohms
5.6 to 5.8 amps 5.8 to 6.7 amps
both of these numbers are from the blue male fuel pump connector
to ground with the fuel pump control unit bypassed to ground; this
runs the fuel pump at an unregulated full speed.
- The factory shop manual makes NO MENTION of the quick and easy
test
jumpering the fuel pump control unit harness connector to ground.
Instead, the factory shop manual walks you through an apparently
unnecessary lengthy step-by-step debugging process requiring the use
of a three, four, and then a five wire jig to debug the fuel pump
control unit. Don't overdiagnose. Just use the jumper and if the
fuel pump operates, then replace BOTH the fuel pump and the fuel
pump control unit (or repair the fuel pump control unit).
- If I had diagnosed following the factory shop manual, I would have
concluded only that the fuel pump control unit needed replacement;
yet, had I replaced only the fuel pump control unit, the humming
fuel pump (drawing excess current) would have burned out the new
fuel pump control unit in months.
- For the longest time I was confused about the various debugging
procedures in the factory shop manual. What cleared it up was the
realization of all the proper connector names! I've made a sincere
attemp in this note to use the proper names at all times.
- Many folks say you can test the deliver of fuel past the fuel
filter
(in the engine compartment) by squeezing the fuel hose while the
engine
is cranking to feel for fuel pressure. I can't tell. I recommend
removal of the fuel filter. It provides proof positive.
- The factory shop manual goes into the engine control unit
debugging.
It was not needed in my case so I'm glad I skipped that part.
- The hardest thing in the world was to find the locations of the
various units; and to find out how to remove some of them. In this
note, I take special care to describe both the name of the unit and
the precise location, for others to benefit.
- Most folks recommend disconnecting the battery & removing it from
the
car when working on the fuel tank. I didn't do this, but you should. |
