Question about 1998 GMC Jimmy
I replaced a dead fuel pump two months ago on my 1998 GMC Jimmy. For the last month or so, I got some 'random misfires' according to the engine code, the vehicle kept running when it happened. A few weeks ago I replaced the fuel filter to see if that would help; it didn't. Currently, it won't start. Fuel is not getting to the cylinders. I am getting 30 psi of pressure with the key in the 'on' position, it very slowly goes down to about 28 psi...(over 30-40 seconds).
I have read on here that while plugging the return line you can check the pump pressure. However, when I removed the return line from just behind the throttle body, no fuel came out to block.
Bad fuel pump/assembly? Bad regulator? Both repairs will consume time and money...I'd like to be more certain of the problem before I start moving a wrench. Ideas/help?
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Posted on Jan 02, 2017
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