Question about 1994 Jeep Grand Cherokee

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My son just bought recently a 94 grand Cherokee Laredo and now it has a problem with starting, i think it is the fuel pump but not completely sure? it wont run unless you pump the heck out of the accelerator and when it does start it runs for a couple seconds then dies!! i also was reading something about a fuel injection pressure valve or something??? could someone point me in the right direction please!!!! i have no experience working on jeeps! it has a 5.2 liter V8 and is fuel injected! HELP!!!!!!! Thank you in advance!

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  • Michael Henderson Apr 06, 2011

    I will try your suggestions! and thank you for such a fast response!!!! I will definitely keep you updated on the progress and or problem, whether its solved or not! Thank you much!

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  • Jeep Master
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It starts and then dies in couple of second.This indicates towards the faulty fuel pump.Get the fuel pressure checked.If the pressure is checked low, then yes its confirmed that fuel pump is faulty and fuel filter is clogged.In most of cases, both the fuel pump and filter needs to be replaced.The fuel pressure, it can be checked at any local car garage. ---------------- Also check and confirm that there is fuel in the jeep. If its very low fuel then in some cases this causes the problem. Also check and confirm that fuel pump is functioning properly and the fuel filter is not clogged. One of the easiest ways to check for a fuel pump related problem is to spray a little starting fluid into the air intake throttle body while trying to start the car. If the jeep starts momentarily, then there's a good chance the fuel pump is not working.But if the engine shows same problem with starter fluid sprayed on intake throttle body.Then the problem relates to the fuel pump relay.The fuel pump relay is located in the Engine compartment fuse box. The fuel pump relay gets power from battery. And this relay is controlled by ECM/ ECU( electronic control module/unit).Its also called computer of the jeep.The relay ground is connected to ECM.----- So first you can try spraying the starter fluid and check.If the engine starts and runs properly, then yes its confirmed that fuel pump is the cause of problem.But if same problem noticed with starter fluid, then get the fuel pump relay checked.Its a 12 volt part.By pass the relay and check.Directly get the fuel pump connections connected to 12 volt battery and check.This will confirm if relay is faulty or the ECM is faulty. --------- This troubleshooting will point towards the exact fault.So as per that you can get the faulty part replaced.This should help.Keep updated.Thanks.Helpmech.

Posted on Apr 06, 2011

  • raj somaiya Apr 06, 2011

    yes that will help.Keep updated with details.Thanks.Helpmech.

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