- #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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- #25 of 93
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Re: Does my 99 Jimmy need its fuel pump replaced? [jpilchesky]
by countryboy276
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Feb 24, 2007 (1:21 pm)
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Replying to: jpilchesky (Jan 19, 2007 9:26 am)
Hello,
I am having similar problem with my 98 4x4 Jimmy did you figure out what the problem was?
Thanks
David
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- #26 of 93
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Re: Does my 99 Jimmy need its fuel pump replaced? [countryboy276]
by jpilchesky
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Feb 24, 2007 (3:16 pm)
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Replying to: countryboy276 (Feb 24, 2007 1:21 pm)
It actually worked for about two weeks, and then shut down again. We've been in snow for that time, so I didn't get to take the advice of repairdog and change the fuel filter. It's sitting in a parking lot, and as soon as I can tow it home (snow is everywhere making it difficult), I'll change the filter and let you know. Sorry can't be of more help right now. It cranks over, and when I put a shot of gas in the carb, it fires right up.
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- #27 of 93
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Re: Does my 99 Jimmy need its fuel pump replaced? [jpilchesky]
by countryboy276
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Feb 24, 2007 (6:11 pm)
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Replying to: jpilchesky (Feb 24, 2007 3:16 pm)
I am in a similar situation with the snow..At least my truck is the house. I changed my fuel filter too and my truck ran good for about a month, then started the same thing again. What diagnostic codes have you received? I get a PO147 which is HO2S Heather circuit bank1, sensor 3. HO2S is Heated Oxygen Sensor. According to some info I found..When the ignition is turned on, battery voltage is supplied to the HO2S heater to provide for faster sensor warm-up,thus allowing sensor to become active in a shorter period of time. When the temperature warms up more I am going to trouble shoot HO2S heater sensor and probably install new O2 sensors since my truck has 160,000 miles on it and they haven't never been changed. Keep in touch since it seems we have about the same problem. We might be able to help each other out by sharing info.
David
countryboy276 insightbb.com
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- #29 of 93
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fuel pump regulator question on 91-93 Jimmy
by chrissanders
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Apr 24, 2007 (8:56 pm)
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I currently own a 1991 Jimmy, but it has many problems. The jimmy i have now is 2 door, dont know if that matters, I just bought a 1993 4 door Jimmy and the only thing wrong with it is the fuel pump regulator. I was wondering if I could take the fuel pump regulator off of my 91 jimmy and put it on the 1993 jimmy I just bought. If you know the answer please email me at chrissanders91aol.com
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