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Ask sprinkles08 Your Own Question
sprinkles08, ASE Certified Technician
Category: Jeep
Satisfied Customers: 22672
Experience:  Chrysler/Dodge/Jeep Master Certified, ASE Master and Advanced Certified, Trans and Hybrid Specialist
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Engine turns over but will not fire fuel pressure at 50,

Customer Question

engine turns over but will not fire fuel pressure at 50
JA: How many miles are on the car? Have you had the fuel pressure tested recently?
Customer: 130,000 miles and just put fuel gage on it and the pressure was at 50
JA: What is the model/year of your Jeep?
Customer: 2002 Grand Cherokee larado 4.0
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: Live out in the bush in Alaska so I have to do it myself checked the fault code with code reader and it said no pending code and no stored codes
JA: Anything else you think the mechanic should know?
Customer: thought maybe crankshaft sensor. pulled it in garage the night before and no issues but would not start next morning
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the Jeep Mechanic about your situation and then connect you two.
Submitted: 1 year ago.
Category: Jeep
Expert:  sprinkles08 replied 1 year ago.

Hello and welcome to JustAnswer!

If you do have fuel pressure then you're either missing spark, there may be a mechanical engine issue or exhaust restriction, or fuel quality could be a concern.

A bad crank sensor is a common cause of lost spark but will usually set a fault code. It's possible for the cam or crank sensor to short internally though and take down the reference voltage circuit which will prevent a code from setting.

Have you checked for spark?