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  1. #1
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    Default 2000 gmc jimmy cranks won't start

    Hi, my usually very reliable jimmy won't start.I was thinking fuel pump ,but not sure.Here may be a few clues.1) about a month ago service engine soon light came on.It still started and ran fine.2) one day recently ,it started but not as quickly as it always had .It cranked about 15seconds before stating.3) A week ago it did not start and I ran the battery down trying to.The next day it started right up ,I just turned the key.I didn't even have to charge up the battery.I got this used a few years back and I wonder if the security system has anything to do with my problem because I didn't know it had an alarm in it till it went off by itself one day.One other question. When you first turn the ignition key does the fuel pump still turn on for a few seconds ,because I haven't been able to listen for that yet.I'm at home by myself today.I think there is pressure in the fuel system because I pushed in the fitting where you attach a pressure gauge and some fuel shot out.I don't own a gauge thanks any advice will help.Some day I would like to disable the security system since I don't know how it works anyway Alan

  2. #2
    Sr. Apprentice MAD JAX's Avatar
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    http://www.wirewerx.com/

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  3. #3

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    You can rent for free a pressure gauge at autozone if theres one by you. The 4.3liter requires about 63psi in order to start and 55 psi to run properly. Ive put many fuel pumps in a 99 jimmy I use to have that had the same symptoms your describing. Even though theres pressure and even if you can here the pump it doesnt mean its not the problem unless you check the pressure. Sometime when it doesnt start put jumper cables on it(even if the other battery is good) and see if that makes a difference. The extra power from the jump spins the fuel pump just a tad more usually getting enough psi to start. I had this happen as strange as it sounds. If the pump motor is getting weak it wont spin fast enough(unless jumped) to produce the pressure needed to start but could usually maintain enough to run fine.
    Also if its raining or damp out and it wont start but then is dryer the day it does. This could be an issue with your distributor cap.




    2011 Silverado CrewCab 5.3L*Ram Air Look Cowl Induction Reflexxion Hood*6" Pro Comp Lift*Flowmaster Dual exhaust*Perfect Launch Rear Diff. Cover*Led Smoke Taillights*L.E.D.Smoke 3rd Brakelight*60" L.E.D. Tailgate Bar*Rearview Mirror Reverse Camera and Sensors*Smoke Headlight Covers*Front Bumper Grill Insert*Deezee Black Alum. Diamond Rail covers*20" Ultra Motorsports Rims wrapped with 35.5"B.F. Goodrich Tires*Inchannel Raingaurds*CAI*Bullydog GT Tuner*Alpine Amp*Boss 6x9's*Boston Acoustic Subs*Terrantula Tweeters*Custom Sub box*Red Led Interior Accents*5% Ultimacool duo tint rear window and doors, 20% front doors*Custom Vinyl Graphics*Demolded*Debadged*Painted drums and calipers*
    Future Mods Include: Custom Interior Hydrographics, Electronic Rollup Toneau Cover, 4.56 Gears, Painted rear bumper

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