Question about 1993 Jeep Grand Cherokee

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1994 Jeep 4.0 litre. Vehicle does not activate fuel pump when ignition is turned on. I turned ignition on for 1 minute, and the relays chattered after 1 minute. Once the system activates the relays, the fuel pump will come on and the vehicle will start.

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This one's tricky. you have to drop the fuel tank and clean the grounds for the fuel pump (such a mess to do) and make sure that the ecu and battery are properly grounded, as well as cleaned. if the problem persists, you may have wiring damage to the fuel pump or the ecu could just be freaking out.

Posted on Aug 20, 2008

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I have a 1994 Jeep YJ having issue with flasher relay replace the relay for turn signals and switched out both relays the vehicle idled and after about 10 minutes of idling the vehicle just shut off


Hi there I am technical mechanical and electronic engineer mechanic sounds like the theft system is not working right! Or the two problem with it is two different things! Try the to put a fuel pump pressure tester on it also I check the battery conn. Clean them to maybe too the motor is getting to much or not any air got to have the air!!! Check out ignition system put a spark plug tester and check the coils and in jeters with a spay bottle and spay them and the manfolds to your checking out for air you can hear the change in your motor and see them take in air

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Location of fuel pump relay


A fuel pump relay will not effect spark, and you can usually listen to the fuel pump to hear it kick in 1 sec before you crank the vehicle over. Are you sure you are not getting spark? How did you test for spark?

Sep 23, 2015 | Mercury Cars & Trucks

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My 1994 Jeep Grand Cherokee with the 5.2L is very difficult to start if it has not been run in the previous 6 hours. Replaced ignition coil but didn't solve the problem. After sitting overnight it


Low fuel pressure.
You need to check the fuel pressure on the first crank and watch it as it is running.
Requires a special gauge.
If it were just a starting problem I would say it could be a pump relay, but not if it runs rough for 5 min.
Might be a dirty filter or problem in the tank.

Jun 29, 2012 | 1994 Jeep Grand Cherokee

1 Answer

Fuel pump does not turn off after turning key on and the relay 'chatters'.


Check your ignition switch for operating correctly, two screws hold it in, mounted under the steering column about an inch away from the turn signal switch. And assure that there are no shorts to wires going to fuel pumps.

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1 Answer

Engine (97 ford ranger) stopped at stop lite and would not restart. Spark to plug wires, plenty of gas, good battery. after cranking several times, will start and run 3 or 4 sec. THE RELAY TO THE FUEL PUMP...


Just for the hell of it replace the fuse with a new one relative to the fuel pump also clean and inspect all electrical plugs and connections associated with the fuel system. There may be a bad ground with out the truck in front of me it will be difficult to go any further it is possible the pump is not creating enough pressure to close the relay have you replaced the fuel filter? If possible do a fuel pressure check at the fuel rail it should be 30 - 40 psi if not replace the pump.

Oct 05, 2009 | 1997 Ford Ranger SuperCab

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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

Sep 22, 2009 | 2000 Jeep Grand Cherokee

2 Answers

Both fuel pump relays run hot. I have replaced both of them. The truck started and ran for about 30 minutes then quit. I replaced the relays and it ran for a few minutes and quit again.


You could have a bad fuel pump relay switch. The fuel pumpmag-glass_10x10.gif relay switch gets the fuel pump running in the vehicle during the start cycle. The terms fuel pump relay and fuel pump relay switch are used interchangeably. The fuel pump relay begins its job when the automobile operator turns to the ignition on, but before the motor is actually running. At that point, the fuel pump relay in some cars sends a signal to the ignition switch, which in turn sends a signal to the fuel pump to turn on. Others fuel pump relays have actual circuitry inside of them that receive the ignition signal and directly signal the fuel pump to engage.

Have a great day!

Sep 05, 2009 | Ford F-350 Cars & Trucks

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Mazda Lantis will not start


What you can do is disconnect the fuel filter and have an assistant watch under the vehicle while you turn the ignition switch (but with out actually turning the engine on. If the Fuel pump is an electrical fuel pump it will spit out fuel for about 3 to 5 seconds.
If nothing happens then a more extensive method to checking the fuel pump


Ok if you could find the fuel pump relay.
It will have either 4 pins or 5pins
This is a trick to activate the fuel pump with out the engine actually running and for longer that 3-5 seconds.
the 4 pins are numbers 85 86 30 and 87 (87a)
If you can remove the relay and memorize where the pins go. Then acquire a bobby pin or paper clip and cross the terminals 30 and 87 (87a) and if the fuel pump activates then it functions but remember to have the key in the ignition with it to the run postion but the engine off. If this works then the relay could be bad, Test Terminals 30 and 85 for resistance.

Reply if you have questions

Jul 13, 2009 | 1994 Mazda 323

1 Answer

Trying to reset theft system


Can try doing a  relearn process, it is pretty simple and will take 30 minutes, if it'll work for you at all since your problem doesn't sound like a computer issue.
30-Minute Learn Procedure
1. Turn on the ignition, with the engine OFF.
2. Attempt to start the engine, then release the key to ON; the vehicle will not start.
3. Observe the SECURITY tell tale light. After approximately 10 minutes, the light will turn OFF.
4. Turn OFF the ignition switch, and wait 5 seconds.
5. Repeat steps 1 through 4 - two more times - for a total of 3 cycles of 10 minutes. 3x10 = 30 minutes.
The vehicle is now ready to relearn the Passlock Sensor Data Code and/or passwords on the next ignition switch turn from OFF to CRANK.

Important:
Turn the Ignition Switch OFF.
The vehicle learns the Passlock Sensor Data Code and/or password on
the next ignition switch transition from OFF to CRANK. You must turn the ignition
OFF before attempting to start the vehicle.
6. Start the engine. The vehicle has now learned the Passlock Sensor Data Code
and/or password.
7. With a scan tool, clear any DTCs if needed. History DTCs will self clear after 100
ignition cycles.
Without a scan tool you may have momentary starter interruptions while history clears itself.

Good luck and hope this help's. keep me posted if you need other ways to disable the passive lock system

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