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Tech501
Tech501, Auto Service Technician
Category: Car
Satisfied Customers: 747
Experience:  38 years exp, ASE Mastertech with L1 Advanced Engine performance
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Truck started this morning, but now it wont get gas

Customer Question

Truck started this morning, but now it won't get gas and just turns over.
Submitted: 11 years ago.
Category: Car
Expert:  Tech501 replied 11 years ago.
What makes you think it's a fuel problem? Have you checked for spark?
Customer: replied 11 years ago.
Reply to Tech501's Post: Yes! it doesn't have any spark either
Expert:  Tech501 replied 11 years ago.

OK, let's start over. We need make, model, year and engine size.


You need to test for 3 things



  1. Spark at the plug end of the wires

  2. Injecter pulse using a noid light. (shown below)

  3. Correct fuel pressure using a fuel pressure gauge.

Reply back when you have all of that and we should be able to tell you something.


Customer: replied 11 years ago.
Reply to Tech501's Post: Hello, sorry am at work, but anyway I had everything check, switches, etc. but nothing, not spark, no gas, the gas gage, battery gage and no check engine light.
Expert:  Tech501 replied 11 years ago.

Your saying the engine cranks but no lights on the dashboard?


Does it have injecter pulse?
What is the fuel pressure?


Customer: replied 11 years ago.
Reply to Tech501's Post: No injecter pulse, no fuel pressure.
Expert:  Tech501 replied 11 years ago.

What kind of truck is this?


Make, model, year and engine size.

Customer: replied 11 years ago.
Reply to Tech501's Post: Jeep, Grand Cherokee, 1997 v6, 4WD.
Expert:  Tech501 replied 11 years ago.

Well, the one thing that might be able to cause all that would be the ASD (Automatic shutdown )relay. You should be able to locate that under the hood. Here's the wiring schematic. You can follow that to troubleshoot what power sources you do and don't have at places like the fuel pump relay.




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Customer: replied 11 years ago.
Reply to Tech501's Post: One of the guys working on my vehile says it might be the computer, which I'm hoping it's not, but could that also be the problem?
Expert:  Tech501 replied 11 years ago.
Possible, but not real likely.
Customer: replied 11 years ago.
Reply to Tech501's Post: Okay, but he said he tried everything.
Customer: replied 11 years ago.
Hello again, I still haven't found the problem, and because I don't have a check engine when trying to start it and it does not scan for a code (scan tool does not detect or get any codes) my PCM (computer) is gone. But I want to be sure before I buy another one.

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