- #15 of 93
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The solution
by 97jimmy1
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Dec 27, 2006 (1:14 pm)
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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
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- #16 of 93
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Re: 1994 S-10 Blazer getting no power to the fuel pump [pwardon]
by repairdog
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Dec 30, 2006 (5:21 am)
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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 ....
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- #17 of 93
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Re: 97 Jimmy will not build fuel pressure [97jimmy1]
by tech1help
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Jan 02, 2007 (10:16 pm)
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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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- #18 of 93
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Re: 97 Jimmy will not build fuel pressure [repairdog]
by slim10
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Jun 07, 2007 (7:45 pm)
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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
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- #19 of 93
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GMC Jimmy Fuel Pump Issues
by jpilchesky
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Jun 27, 2007 (2:02 pm)
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- #20 of 93
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Does my 99 Jimmy need its fuel pump replaced?
by jpilchesky
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Jan 19, 2007 (9:26 am)
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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.
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- #21 of 93
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Re: Does my 99 Jimmy need its fuel pump replaced? [jpilchesky]
by repairdog
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Jan 20, 2007 (7:37 am)
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Replying to: jpilchesky (Jan 19, 2007 9:26 am)
Could be electrical and you need the code readout to see what tripped it (could be your answer -or not). To test fuel pressure need $35 fuel pressure tester and 60psi key on engine off and running 53psi min. Then could be simple cap/rotor problem so replace those. Next is test coil and ignition module mounted on it (stores test for free). Then crank sensor next. As to the lights could be just burned out and the seats check the fuse under hood for that baby - if the switch or wiring gets rubbed thru that can blow the fuse (your manual tells which is which and so does the inside of the cover). Let us know.
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- #22 of 93
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Re: Does my 99 Jimmy need its fuel pump replaced? [repairdog]
by jpilchesky
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Jan 25, 2007 (9:02 am)
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Replying to: repairdog (Jan 20, 2007 7:37 am)
I replaced the ECM fuse and it didn't start, then I cleaned carefully the ports where you put the fuse into, thinking maybe dirt was in there, replaced the fuse, changed the oil, and then it did start. It worked for two days, and then after sitting overnight in the garage, it wouldn't start. I did put gas directly into carb, and it cranked. What about fuel filter?
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- #23 of 93
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Re: Does my 99 Jimmy need its fuel pump replaced? [jpilchesky]
by repairdog
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Jan 25, 2007 (1:26 pm)
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Replying to: jpilchesky (Jan 25, 2007 9:02 am)
Yes, under the frame under the drivers side door area - a mess to do but not hard about $15 part. The only way to know about pump is to test the pressure. If pressure OK then its electrical/sensor and change the cap/rotor first, then check coil, and then crank sensor.
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- #24 of 93
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Re: Does my 99 Jimmy need its fuel pump replaced? [jpilchesky]
by jlflemmons
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Jan 25, 2007 (8:41 pm)
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Replying to: jpilchesky (Jan 19, 2007 9:26 am)
I know this will sound crazy, but give the gas tank a swift kick. I learned this trick from a wrecker driver who said the common failure in the fuel pump was that it would stop at a "dead spot" in the windings. Gave the Yukon a kick in the tank when this same thing happened and bingo, fired right up. Took it to the dealer (warranty) and one of the mechanics admitted that they did the same thing when one came in on the hook and they didn't want to physically push it into the shop for the pump replacement.
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