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GMC Jimmy Fuel System

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

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#11 of 93 Re: 97 Jimmy will not build fuel pressure [97jimmy1] by repairdog Oct 15, 2006 (2:53 am)
Replying to: 97jimmy1 (Oct 14, 2006 1:31 pm) OK - checked Haynes again and the test wire is red and by the firewall and master cylinder. This bypasses the relay. Check the ECM Bat fuse that powers the relay and switch the fuel pump relay with another thats the same as a test. Also remember that the 97 only has a known ignition switch (actually a module with wiring in the column) failure and it effects most power on the vehicle as it runs thru there when the key is turned. Replies to this message: 97jimmy1 (Oct 15, 2006 12:16 pm) slim10 (Jun 07, 2007 7:45 pm)
#12 of 93 Re: 97 Jimmy will not build fuel pressure [repairdog] by 97jimmy1 Oct 15, 2006 (12:16 pm)
Replying to: repairdog (Oct 15, 2006 2:53 am) Powered the test wire and the pump works fine. Rotated the relays (the 3 in the glove box) and no change. Checked all of the standard fuses and they were fine. Is the ECM Bat fuse located in the regular fuse box by the drivers side door or some where else?
#13 of 93 jimmy won't start by rickvan Oct 16, 2006 (11:01 am)
I have a 95 GMC Jimmy with 300000 kms on it, I have done the fuel pump, sending unit and have done repairs to the rotted out fuel lines. If it sits for more then 4 hours I have to use starter fluid to get it going. 2 hours it will start 4 hours is touch and go 6 hours forget it. I have been told the fuel lines need to be replaced because it is getting a air pocket in the lines. Any insight in to this situation would be appreciated.
#14 of 93 1994 S-10 Blazer getting no power to the fuel pump by pwardon Dec 26, 2006 (11:59 am)
I have a 1994 Chevrolet S-10 Blazer with a 4.3L Vortec. Came home with no problems. Next morning it would not start. Mechanic cannot determine problem except fuel pump isn't getting power. I had the fuel pump replaced eight months ago. He said to take it to dealer for further diagnosing. Before I do, does anyone have any suggestions or opinions about what could cause the fuel pump not to be getting power? Please help! Replies to this message: repairdog (Dec 30, 2006 5:21 am) mhildreth (Dec 11, 2007 5:14 pm)
#15 of 93 The solution by 97jimmy1 Dec 27, 2006 (1:14 pm)
The solution to my original post was the the starter switch (not the key but the switch attached to it). Apparently this is a common issue on the 97s
#16 of 93 Re: 1994 S-10 Blazer getting no power to the fuel pump [pwardon] by repairdog Dec 30, 2006 (5:21 am)
Replying to: pwardon (Dec 26, 2006 11:59 am) Fuel pump relay or fuses need to be checked and there is a red wire up by the brake booster that can power the pump bypassing all relays etc to test it - shop should know this or ....
#17 of 93 Re: 97 Jimmy will not build fuel pressure [97jimmy1] by tech1help Jan 02, 2007 (10:16 pm)
Replying to: 97jimmy1 (Oct 14, 2006 1:31 pm) Did you ever figure out why your 97 Jimmy will not build fuel pressure If not I can help. For starter's can you hear the fuel pump hmmm when you turn the key switch on and off? If so have you checked to see if fuel is flowing at all by depressing the shrader valve back by rear of engine and having someone crank engine. If fuel is flowing or squirts with key on engine off then you have pressure. You need 60 PSI to start the vehicle on a vortex setup. If all the above information is happening then you might want to check you Crank Position Sensor for resistance. If it does not have a signal, your MFI manifold will not fire the fuel injectors. If you Have no pressure at the shrader valve when depressed, with key on engine off then your fuel pressure regulator has gone bad. Hope this helps.
#18 of 93 Re: 97 Jimmy will not build fuel pressure [repairdog] by slim10 Jun 07, 2007 (7:45 pm)
Replying to: repairdog (Oct 15, 2006 2:53 am) I have 97 s-10 blzr with fuel pump issues. The red test wire mentioned to bypass the relay, is it an open wire with a female spade connector on the end or is it attached to a junction or terminal? Thanks
#19 of 93 GMC Jimmy Fuel Pump Issues by jpilchesky Jun 27, 2007 (2:02 pm)
#20 of 93 Does my 99 Jimmy need its fuel pump replaced? by jpilchesky Jan 19, 2007 (9:26 am)
My 99 Jimmy was working fine in the morning when I came home, and when I went to restart it several hours later it would not start. Ignition turned over, and there definitely was gas in the tank, but I added some anyway, and it still would not start. I replaced the ECM fuse under the hood, and replaced several other fuses related to the fuel pump. No start. I then put gas directly into the carb, and the engine turned over but then died.   From other discussions, I could not find this issue addressed for specifically the 99 Jimmy. It is a 4wd.   Additional incidents that may be related: The service engine soon light was on for about a week, then was off for about two weeks. It came on again two days before this situation.   The fuel gauge would read accurately until it got to about 1/4 tank, then it would jump to either full, or completely empty. I only ran out of gas one time due to this problem and that was about a year ago. Since that time, I have always kept fuel level high to avoid this and have used my trip odometer to keep me posted on fuel level.   Otherwise, possibly unrelated, the dash lights for the radio and steering wheel are half lit, but recently the lights for the radio are completely dark. The heated seat for the driver's side stopped working during the last two weeks. Replies to this message: repairdog (Jan 20, 2007 7:37 am) jpilchesky (Jan 25, 2007 9:02 am) repairdog (Jan 25, 2007 1:26 pm) jlflemmons (Jan 25, 2007 8:41 pm) countryboy276 (Feb 24, 2007 1:21 pm) jpilchesky (Feb 24, 2007 3:16 pm) countryboy276 (Feb 24, 2007 6:11 pm)

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