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GMC Jimmy Fuel System

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

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#68 of 93 Re: 99 GMC Jimmy hesitation problem [nljewell] by nljewell Dec 03, 2008 (1:24 pm)
Replying to: nljewell (Dec 02, 2008 6:08 am) Well I put on my new cap and rotor and that didn't do squat. I took it in for a diag. test this morning and the "mechanic" said he didn't know since there was no check engine light on, so he couldn't check the codes. My next steps are to change coil, temperature sending unit, and change trans. filter. Please reply if you have any ideas.
#69 of 93 Re: 99 GMC Jimmy hesitation problem [nljewell] by tech1help Dec 03, 2008 (3:03 pm)
Replying to: nljewell (Dec 02, 2008 6:08 am) when was the last time you checked your cat converter?sounds more like you engine may not be exhausting correctly. if you are driving and it feels like the engine feels like it is cutting in and out, especially when first started or sometimes wnhe you hit throttle, or going up hill. I would definetly be looking at the cat converter, or the fuel pressure regulator. Replies to this message: nljewell (Dec 04, 2008 4:50 am) nljewell (Dec 04, 2008 9:41 am) nljewell (Dec 08, 2008 4:55 am)
#70 of 93 Re: 99 GMC Jimmy hesitation problem [tech1help] by nljewell Dec 04, 2008 (4:50 am)
Replying to: tech1help (Dec 03, 2008 3:03 pm) Thank you tech1help, I will definitely give it a shot.
#71 of 93 Re: 99 GMC Jimmy hesitation problem [tech1help] by nljewell Dec 04, 2008 (9:41 am)
Replying to: tech1help (Dec 03, 2008 3:03 pm) Cat. converter tested good. Fuel pressure was at 55/58. Mechanic suggested to spray some carb cleaner around plenum when engine is cold, if idle goes up then that seal might be bad. He said when engine gets warmed up that seal will expand and the hesitation would stop, only causing hesitation when engine is cold. Replies to this message: nljewell (Dec 08, 2008 4:55 am)
#72 of 93 99 jimmy starting problems by poorjimmy Dec 04, 2008 (4:03 pm)
well one day shut it off, went for lunch, then it wouldn't start, poured gas in throttle body, it would run till gas ran out, so I disconnected the inlet to the fuel filter and tried starting, but no fuel came out... went for some supper called tow truck, while waiting with the inlet line still disconnected, i tried starting and gas started pouring out?, so i connected fuel line to filter and it started no problem drove it home.   Next day started no problem, drove around town, came home shut it off, and wouldn't restart, this time poured gas in throttle body and still wouldn't even start this time, "scratching head"   check all fuses, replaced relay, disconnected fuel line and re tried, no fuel coming out... Left for a few days, went out tried to start started right up, tried 3 times then would start with or with gas in throttle body, i have ordered a new pump, and have changed fuel filter, just not sure why it all works one day then nothing, what really gets me is it will crank over but seems to be getting no spark and no fuel.   Any help would sure be nice.   thanks
#73 of 93 Re: 99 GMC Jimmy hesitation problem [nljewell] by nljewell Dec 08, 2008 (4:55 am)
Replying to: nljewell (Dec 04, 2008 9:41 am) I sprayed carb cleaner around plenum and nothing happened. When I was at work this weekend I parked inside, when I went to leave after it sitting for 13 hr. it took right off with no hesitation????
#74 of 93 Vortex 4.3L by shootert Dec 26, 2008 (8:35 pm)
I and a Son own 4 S10 Blazers an 1 Jimmy. The Jimmy an 2 Blazers have Vortex Engs. in them. The fuel lines inside the air induction intake or what ever have some kind of plastic type fuel lines going to the spider injector an a return line. These lines keep splitting , an the leaking fuel goes directly onto the tops of the intake valves resulting in flooding.  Please what are these lines made of,so we might purchase it in a bulk roll. The Dealer gets a $100.00 per line with end fittings. The line itself is approximently eight inches long !  Can you help us ? Ron N Texas
#75 of 93 2001 GMC Jimmy Running Erratic by jstew41 Dec 30, 2008 (11:41 am)
Hi. I have a 2001 GMC Jimmy with a 4.3l vortec. It shuts down all the time while driving down the road but usually only happens when its sittin around a Half tank of fuel. Now it just started doing this when I first start it in the mornings its very hard to start but it idles fine, when I hit the gas it starts mising and the RPMS are very erratic. It runs fine with a full tank. Anyone have any ideas. Any help would be greatly appreciated. Replies to this message: singe (Feb 02, 2009 6:32 pm)
#76 of 93 Re: Fuel leak!!! [97jimmy4dr] by 340sport Jan 01, 2009 (4:17 pm)
Replying to: 97jimmy4dr (Sep 15, 2008 5:18 pm) I have a 1996 GMC jimmy and noticed fuel smell and fuel dripping on the ground. Your problem will be corrosion and pinholes in the fuel line likely just in front of the rear tire at the frame rail where it runs. Basically had to take it to my mechanic who replaced a portion of the rusted fuel line. This will resolve your problem.
#77 of 93 Re: 2001 GMC Jimmy Running Erratic [jstew41] by singe Feb 02, 2009 (6:32 pm)
Replying to: jstew41 (Dec 30, 2008 11:41 am) Hi,   Did you find a solution for this problem? I have the same vehicle with nearly the same problem.   Reply to this message with any info. It will email me automatically. Thanks!

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