Question about 1989 Jeep Comanche

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New pump, no fuel pressure at fuel rail??

1989 Jeep Laredo Automatic 4.0L 4X4, replaced fuel pump verified pump working after put in it started three or four times then nothing? i verified again with it in tank ran hot wire to pump and pump working and good pressure at rail, re-connected wires at splice for fuel pump turned key on at steering wheel and no pressure at rail?? replaced the starter relay still no power to pump when key turned on. engine cranks over but no fire because no fuel at rail?? started three or four times then just like that lost power to pump?? causing no fuel to rail? what other relays? inertia switch? fuse? am i missing something in between............... thanks Robert

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  • Anonymous Mar 14, 2014

    Problem between relay and fuel pump. I have 00.6v with key off and 00.8/00.9v with key turned on (at the fuel pump connection). Guessing maybe a short somewhere??

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Fuel pump relay

Posted on Oct 04, 2009

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1989 ford f-150


If the fuel pump(s) run while the pressure is falling, replace the fuel pressure regulator and (although I'm sure you've already done this), replace the fuel filter. If the fuel pumps appear to be turning off by themselves, replace the inertia (fuel cutoff) switch.

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I have a 1996 jeep grand Cherokee Laredo. it began to stall at idle and now will not start


Check audibly the fuel pump. It will run for 3 seconds when ignition is turned on, but engine not started. If it makes noise, you could check for pressue at the fuel rail. There is normally a schrader valve you can press. Tske care, fuel under pressure will come out when pump is ok.
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2002 jeep liberty turns over but will not crank. I hear the fuel pump at the gas tank but it still acts like it isn't getting any gas, I thought it was the gas because my husband's truck stopped...


Check for pressure at your fuel rail, If your fuel pump is working correctly you should be getting fuel spraying out of the rail when you press in on the needle valve (sometimes covered by a small cap)

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97 jgc laredo 4.0 in line 6, 4x4...ok here it is...sometimes the fuel pump will run and start. However like now the fuel pump is not running...kinda like intermit power..sometimes it runs sometimes it...


If the pump starts to jam it wills seem like it won't run. The stuttering on startup is also related to a failing fuel pump as the intank pumps in our Jeep (I have the same ZJ)

Next time it won't start, try hitting the fuel tank with a small hammer (lighty as per not to crack it)
This can sometimes jar the pump in such a way to get the fins spinning again. If this works I would reccomend replacing the fuel pump.

You should also hear the pump prime when you turn the ignition to on (before start)
Priming the pump 3-4 times can help the stuttering on startup.

You can also get a fuel line pressure tester from most auto parts stores and verify that you are holding pressure after the pump is off.

Cheers
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Where is the fuel pump cut off switch located on a 1995 jeep grand cherokee laredo


there is no fuel pump cut off switch . put a fuel pressure gauge on the fuel rail schrader valve turn key on you should have 40+ pounds of pressure if you dont the pump is not working open the relay center under the hood swap the fuel pump relay with the wiper relay and try again if no pressure its not the relay its the fuel pump if you do have fuel pressure that means the relay was bad get a new one the car should start if you do have pressure and the car wont start the injector circuit is dead and what causes this is the crank sensor located on top of transmission bellhousing on driver side auto parts store 38.00 dealer 170.00 when you change it make sure to push it in and hold it while you tighten the bolt hope this helps and please dont forget to rate my solution

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1989 astro van turns over will not start seems not getting fuil gas tank full


#1 NEED TO VERIFY SPARK AT SPARK PLUGS # 2 CK FUEL PRESSURE AT SCHRADER VALVE ON FUEL RAIL ,,PRESSURE DEPENDS ON TYPE ENGINE ....IF NO SPARK AT SPARK PLUGS CHECK SPARK FROM COIL WIRE , IF NO SPARK AT COIL ,CHECK VOLTAGE TO IGNITION COIL SHOULD BE 12 VOLTS, IF NO VOLTAGE AT COIL ( KEY ON ) CHECK FUSES THEN IGHITION SWITCH. IF NO FUEL PRESSURE AND FUEL PUMP RUNS REPLACE PUMP .. CK VOLTAGE TO FUEL PUMP WHILE CRANKING . CK USING PUMP GROUND WIRE AT THE PUMP CONNECTOR THIS WILL PROVE GROUND ALSO. USE TEST LIGHT TO VERIFY

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I have a Jeep grand cherokee laredo and i have installed a new fuel pump and fuel filter but it will not start i have checked all fuses and relays please help.


Having same issue with my 2000 grand cherokee. sometimes fuel pump will prime and car starts the other 50% of time no fuel pump noise only smaller radiator fan will come on and make vibrating whining noise. I have changed out fuel pump and filter as well as checked and ruled out all fuses/relays involved. Need help too

Aug 04, 2010 | 2000 Jeep Grand Cherokee

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No fuel pressure put in a new fuel pump assembly and i still have the same problem wont stay running


Did you actually verify the fuel pressure at the fuel rail? If so, there are some other things to check, fuel filter, fuel rail pressure regulator and an obstructed fuel line.

May 20, 2010 | 2004 Chevrolet TrailBlazer

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2000 Jeep Grand cherokee Laredo wont start. Engine turn over . No noise from fuel pump with ignition on. Replaced fuel pump and filter.Turn ignition on- pump did not run.Jumped the fuel pump at the pump...


sounds alot the the pcm it controls the fuel pump and ign system but the anti theft would keep it from starting because the key has a transponder in it programmed for that vehicle and that would kill all ign if triggered

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1 Answer

1997 GMC 1 ton 4x4 hard to start after it has warmed up. changed fuel filter no help No code to be read We have notice that the fuel in the rail is vapor not a liquid. Is this normal and if not what would...


The fuel pressure should hold at or near the 45 lbs after you shut the truck off.
You have one of three problems causing this.
One, the fuel pressure regulator is leaking internally and allowing fuel to return to the tank via the return line. To verify, use a pair of pliers and gently pinch the return line off. Turn the key on to the run position, the pump will run for 2 to 5 seconds and pressurize the line. Watch the pressure gauge, it should hold pressure. If it does, change the regulator.

Two, the check valve at the pump is weak. To verify, turn the key to the run position, when peak pressure is reached, gently pinch the pressure line and watch the pressure gauge. If the pressure remains near the peak pressure the check valve is bad. Replace the fuel pump.

Three, if neither of the above procedures work, you have a leaking injector. You will want to remove the fuel rail, pressurize it to find the bad injector.

Any one of these failures will cause the "vapor" issue you describe.

Good luck, let me know what you find.
Regards,

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