Why is my jeep shutting off?

Question

I have a 1990 jeep cherokee larado. it would run for about 3 seconds then shut off. a mechanic said the fuel pump was bad and put a new one in yesterday. the problem now is it will run for maybe 5 minutes then shut off. if i let it sit for a half of hour or so, it will start again for a few minutes. i dont understand these vehicles. can somebody tell me whats probably going on? thanks........

Answer 1

But check the distributor cap.  Or in that area.   My husband had the same problem, and it was int he distributor cap.  Dad said it was the vacumn advance.  If it is not grounded, it can not make contact.  Check that out.    

good luck, and let me know what happens.

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Answer 2

My husband is a mechanic if it has a pickup coil in the distributor that could be it or if it has a crank sensor that could be it as well. both of these can be effected by temp.  

Answer 3

  Possible vapor lock.  Try loosening the gas cap and running the engine.  Seriously!

Answer 4

its kinda old

also, it might need a new battery

Answer 5

You might have a bad fuel in the tank. Possibly water from condensation. The fuel pump may be working but the filter may be clogged and the fuel injectors may be as well.

Answer 6

when you change fuel pumps you should also changed the fuel filter and run injector cleaner through it a easy way to tell if it is fuel related turn the ignition to on position you will hear a whine that is the fuel pump pressurizing go under the hood on top of the engine you find the injectors but there should also be  a valve stem looking thing this is to release fuel pressure in the system is the system is good there will be a squirt or spray of fuel out of the valve if it just bubbles or kinda just fill up then you know the problem is with the system possibly the filter try this and if you find it not to spray changed fuel filter  it should be changed any ways with a new pump  good luck