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GMC Jimmy Fuel System

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

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#8 of 93 95 jimmy wont start by dbouchard Oct 21, 2006 (4:14 am)
replaced plugs, cap, rotor,good spark at coil and at plugs , no codes, starts up when you shoot it with starting fluid, and will stay running ,try to restart and also starts most of the time but when it dont have to reshoot with starting fluid maybee once a week
#9 of 93 97 Jimmy will not build fuel pressure by 97jimmy1 Jun 07, 2007 (7:45 pm)
#10 of 93 97 Jimmy will not build fuel pressure by 97jimmy1 Oct 14, 2006 (1:31 pm)
I have a 97 Jimmy that will not build fuel pressure. If you give it starting fluid it will start and run on the starting fluid but then die when you stop feeding it. No pressure at the rail. Other symptoms I have found are that the oil pressure gauge stopped working (Stuck on 20 PSI). The fuel gauge shows just under full and it only has about 1/4 tank. It will not come out of park. All these things worked fine until the fuel issue. I have changed the fuel filter and found that it was pretty well blocked off. I have read that there is a fuel pump run wire under the hood. Is this true? Where would I find it? Any other way to test the pump? I hate to drop the tank and change it out ($300.00) without knowing its bad. Especially since I have the other symptoms. What other types of fuel shutdown safety/security items are on this vehicle (IE. low oil pressure, inertia shutdown)? Replies to this message: repairdog (Oct 15, 2006 2:53 am) 97jimmy1 (Oct 15, 2006 12:16 pm) slim10 (Jun 07, 2007 7:45 pm) tech1help (Jan 02, 2007 10:16 pm)
#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.

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