Question about 1987 Isuzu Trooper

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My 1990 isuzu troopers fuel pump is constantly running and making the battery go dead even though the key and engine is off. What can be the problem?

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Bad switch or someone has bypassed the switch, should shut off when you turn ignition switch off, my 94 does. HUNT

Posted on Jun 07, 2010

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Related Questions:

2 Answers

Where is the fuel cutoff switch on a 2000 isuzu trooper


which engine, ill toss coin, land on v6
check fuses first.
wont crank? that grrrrr grrrrr grrrrr sound
jumper cable start it yet, why not?
or put in a known good charged car battery?
or using any battery charger charge yours?
or buy a new battery, (if rich)

if it cranks and wont start?
check spark x6 (scan it yet?)
if sparks ok try test fuel!
if test fuel fails 100% see bad belt below.

EVER REPLACE THE CAM BELT?
if not and over 60k on the last one
the belt is doomed, living on borrowed time.
got the V6?
58409f45-e1b7-4b56-bd4c-6ca9870d63fc.jpg

Jan 07, 2016 | 2000 Isuzu Trooper

1 Answer

Engines not starting


If your Trooper "cranks" but doesn't start or runs for a few seconds and stalls out, your fuel pump has gone bad. They are notorious for this. If you replace your fuel pump, replace your fuel filter. More information is needed though.

Apr 04, 2014 | 1997 Isuzu Trooper

1 Answer

My 1989 isuzu trooper will not start it is not battery or alternator i replaced the fuel pump and it started 3 times then after sitting for a few minutes it wouldnt start anymore any ideas?


i had similar problems with my 1989 as well as the wife's 1990....my problem was freyed wires near gas tank as well as fuel pump relay...the wife's was relay as well.try to follow fuel pump and relay wires test along the way. hope this helps!!

Dec 30, 2010 | 1989 Isuzu Trooper

1 Answer

1998 trooper fuel pump, works while hooked straight to battery but not when pluged in, and tryed to start.


Check the fuel pump relay and fuses it may not be getting power when you turn the key on.

Aug 30, 2010 | 1990 Isuzu Trooper

1 Answer

My 1990 isuzu troopers fuel pump is constantly running and making the battery go dead even though the key and engine is off. what can be the problem?


start with pulling the fuel pump relay!!
this should kill the power to the pump and save your battery,
so well pulling the fuse but pull and test the relay,, it may have got to hot. if it checks good and clicks when you plug it back in!![key off]
then there is a short in the ignition to relay circuit

Mar 25, 2010 | 1987 Isuzu Trooper

1 Answer

Location of fuel pump 1990 Isuzu Trooper


It is located inside your gas tank

Jul 10, 2009 | 1990 Isuzu Trooper

1 Answer

1990 isuzu trooper will not start in cold weather


Well, could be many things, but first and easiest, check the dist. cap and rotor, and all the plug connections. Any moisture will freeze and short out the ignition system. Also change the fuel filter. If you get the slightest moisture in the fuel it will lock up the filter when the water freezes. Could be a relay, probably "engine relay" that sticks when it gets too cold.

Some starting points I hope.

Jan 05, 2009 | 1990 Isuzu Trooper

1 Answer

Fuel pump


On all Trooper II models the fuel pump is located in the fuel tank, fuel tank must be removed to access.

Nov 24, 2008 | 1990 Isuzu Trooper

1 Answer

Idle speed too high


Look under the plastic intake tube for a hole

Nov 19, 2008 | 1990 Isuzu Trooper

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