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GMC Jimmy Fuel System

93 messages,  Last post on Aug 17, 2009 at 8:23 AM

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#91 of 93 Fuel pump problems with 99 jimmy by schwor Jul 22, 2009 (3:40 pm)
Hi everyone   A week ago truck wouldnt start. Fuel pump would not run.Changed fuel pump....Ran for about a week or so and then stalled again while driving. Had towed and then started again. stalled again....When I play around with the electrical connectors, it will start....Is it the connectors or something else. Thanks! Replies to this message: tech1help (Jul 22, 2009 4:31 pm)
#92 of 93 Re: Fuel pump problems with 99 jimmy [schwor] by tech1help Jul 22, 2009 (4:31 pm)
Replying to: schwor (Jul 22, 2009 3:40 pm) It is recommended by GM that when replacing the fuel pump you also replace the weather pack connector.GM sells the connector preassembled, You just have to cut and splice. Sometimes the connector pins get worn and become loose. You can tug on the wires and feel if they are loose. I have seen it before where the connector was the problem and not the pump itself. Best of luck
#93 of 93 Heat soak problem by huntertb1 Aug 17, 2009 (8:23 am)
I have a 93 Jimmy with a 4.3 cmfi. during the summer months this has happened for 3 rd year in a row. It will start perfect in the morning. I can drive it all day long until I shut it off. When I try to restart it, it almost starts then it just turns into a dead crank. It is getting great spark at all plugs. But the fuel rail is no longer getting fuel.   I replaced the Temp sensor switch (the one that goes to the computer, not the gauge) I though sure it was telling the engine it was to hot, but that wasn't it.   Thing is it has to REALLY cool down to restart, like over night.   Now, the other 3 seasons I NEVER have a problem, starts 100% of the time. That's the only reason I still have it.   I am thinking oil pressure sending unit, but not sure how to test? Is it possible that when it gets hot it could be failing? If so can I unhook the connector and will it go into limp mode and start?   Any ideas on this are greatly appreciated, I am at my wits end with this.

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