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1998 jeep: low fuel..re-start..code reader read p0171 (=lean mixture…

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1998 jeep Tj ca. 90000miles...
1998 jeep Tj ca. 90000miles, has had intermittent problems with hesitation upon acceleration, usually with warm engine, suspected maybe just low fuel, now last trip engine died, first serious hesitation, cant accelerate, then died. Unable to re-start, sounds like it wants to start sometimes, but doesn't keep running, code reader read P0171 (=lean mixture?), how should I proceed?
Submitted: 8 years ago.Category: Jeep
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Answered in 2 hours by:
6/17/2010
Jeep Mechanic: sprinkles08, ASE Certified Technician replied 8 years ago
sprinkles08
sprinkles08, ASE Certified Technician
Category: Jeep
Satisfied Customers: 24,222
Experience: Chrysler/Dodge/Jeep Master Certified, ASE Master and Advanced Certified, Trans and Hybrid Specialist
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Hello and welcome to JustAnswer!

 

The first thing you are going to need to do is check fuel pressure. Your symptoms along with the fuel system lean code point to a likely lean condition caused by low fuel pressure or volume. Check fuel pressure with a gauge while it's under load and acting up. You shoudl have 49.2 +/- 5 psi at all times. If pressure is lower than that under load then you will need to replace the fuel pump assembly.

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