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Chevy S10 - GMC S15 and Sonoma Fuel Pump and Fuel System



  • gonogogonogo Posts: 879
    Yes, do a google search and you will find the how to.
  • johnjohn Posts: 1
    same thing on my 02 ,truck seems to run out of gas at half tank, double checked to make sure just sending was wrong but i still had aout 9.5 gallons in tank. gas gauge always seems funny because i did run out of gas and the fuel low light never come on. now it seems that at half tank the truck feels like its out of gas. so i just put more gas it till i figure out what to rplace.
  • We have a 2000 S-10. Gas gauge hasn't been working properly for years but was told it's $600 to have a new sending unit installed so we just use the trip meter to know when we need more gas.
  • Does anyone know where i can find info on how to install a fuel pressure regulator in a 99 s10.4.3 v6.
  • 2001 S-10 4.3L two seperate occasions would not start this winter.Both times when put in the building to warm up,eventually started.Faithfully have used Heet in every load of gas,and has occured at varying fuel levels.Had it towed the second time and the repair shop wanted $1100 to repair,claiming the pump itself was $600.By the time I figured out where to get the cash for the repair,they called and said it starts everytime now,so I didn't get it replaced.They also siad they couldn't guarantee the fuel pump is the issue.I have never had a problem in the past,including last winter.This winter has been especially cold,but started on days at -5,and then when it was 12,it didn't.Frustrating as it nows sits,will not start,it is 33 out and should go.Will crank but is getting no fuel.Any ideas?
  • bbrianbbbrianb Posts: 1
    I have a 2002 gmc sonoma with 4.3 liter motor. I have been having problems with the fuel pump not kicking on. I used to be able to hit the hitch with a hammer causing it to start. I thought it was a bad motor in the pump. I replaced the pump assembly and fuel filter. Now it still doesn't come on. I have checked all of the fuses and the relay. All are good. I wonder where to look next.
  • gonogogonogo Posts: 879
    You need a wiring schematic and a 12 volt test light. You need to find out where you are not getting 12 volts. The pump wire is grey, when you turn the key on run you get pump power for 2 seconds.
  • I have a 2001 S10 with the 4.3. Having some problems starting. Checked fuel pressure at the shrader valve under the hood and turned the key on and got 55lbs of pressure momentarily then the pressure dropped to nothing without even trying to start the engine. It says in the manual that there should beat least 55lbs of pressure then drop 3 to 10 lbs below that point when the engine is running. If I hit the starter a couple of quick times while the pressure is up it will start and run flawlessly. Any ideas on why the pressure drops to zero?
  • i have a 2003 gmc sonoma crew cab ZR5 4x4. i was noticing problems with my fuel guage so i changed the fuel pump and sending unit out. well to my surprise it didn't fix the problem. whether the tank is full or empty, the guage reads empty and the fuel light is on 100% of the time. does anyone know a fix for this?
  • gonogogonogo Posts: 879
    Don’t know if this will help but best I have. Full is 250 ohm and empty is 40 ohm. 2 wires come from the sender to pcm. 1 is ppl and other is orn/blk, orn/blk is ground. It goes to SP422 on LH frame rail behind cross member at transmission. Seeing you have empty tank I would trace the orn/blk first for loss of ground. Good luck
  • oldironoldiron Posts: 1
    Exact same problem on my 4 cylinder manual trans. I found a broken orange wire at a connector right along side the transmission. I think a stick or branch on the road may have cut it since the wire is very tiny. I repaired the wire and the fuel gauge works fine now.
  • Well at this point we have changed the fuel pump, fuel filter, spark plugs, distributor cap, the spark plug wires, and a handful of sensors. Yet the problem remains for it. I have heard the cat might be the problem.
  • yo man those sending units are not that expensive and they are very easy to replace. The whole unit including the fuel pump cost about 300 but if you look around online you can find one for about thirty dollars by itself, and I mean the floater of course for thirty dollars.
  • Is anyone out there familiar with Chevy's plastic fuel line connection. I had to be towed home the other day due to a huge fuel leak under the cab. I slid under there today and found the hose to the filter loose. I pushed it back on and it seems really secure. Should I get the connector replaced? Do they wear out? I had parked in some loose gravel earlier, and had a little traction trouble when backing out. Is it possible that a piece of gravel hit the connector just right to unplug it? I hope someone can offer some guidance, as it is my wifes truck, and now she is afraid to drive it.
    Thanks, Dan
  • gonogogonogo Posts: 879
    Buy a new filter, install the new filter using the plastic lock clip that comes in the filter kit for the plastic line end.
  • Thanks. I didn't realize that the filters came with a new clip. I have only had the truck about 3mo. It seems tight now and doesn't leak, so maybe whoever changed the filter last time didn't get it plugged in all the way.
  • valsvals Posts: 2
    I have a 1997 chevy s10, 4 cyl. When I went to change the fuel filter, it came off from the plastic line with a slight resistance. The filter is old, and it appears to have a tiny piece of the plastic line still stuck on the filter end. I was very careful when I slid the filter off the plastic line. Did anyone ever hear of the plastic line bonding itself to a rusty filter end? How fragile are these plastic lines?
  • so how did u fix problem same is wrong wit mine
  • I have a 1992 S-10 Blazer with the 4.3 liter V6. It's been sitting unused in my driveway here in Florida for about 4 mo. I tried to start it today and battery dead. Charged the battery, and the engine cranked, but would not start. Poured gas into the throttle body and it will run for a few seconds till the gas is used up and will quit. Ran the battery dead, recharged for about 5 hrs. and tried again with same result. Gas guage went from 1/4 to full. The truck was running fine when I last drove it. Obviously there is no fuel getting to the motor. Could it be filter, pump, or just a bum batter not getting enough juice to the pump. HELP HELP HELP!!!!!!!!!!!
  • gonogogonogo Posts: 879
    When you turn the key on run you should hear pump run for 2 seconds,if not check the connector at the tank for corrosion.
  • You might have a leak in the fuel lines inside the plenum. I checked mine, and had 2 abrasion spots in the fuel return line inside the plenum. One spot was leaking fuel into the plenum. I picked up some poly tubing and replaced it. I also replaced the fuel pressure regulator while I was in there, a $50.00 part. I also noticed some abrasion spots on the individual injector lines inside the plenum, so these will eventually need to be replaced also. These were not leaking yet, however. The whole "spider" can be purchased on ebay for around $200.00. My vehicle is a 96 chevy blazer, with 225k miles on it. Evidently the lines abrade each other with the vibration of the engine and eventually wear out. Bad design. I am hoping my fuel mileage will increase above the 14 -15 mpg I am getting now!
  • hi new here. My poor truck is not running, towed from lowes with a load of lumber. yay!
    Was running ok and the service light came on went in to pay for lumber came out and just cranked. Wiggled everything under the hood and it started?

    Towed home when it would not start after loading up. Sprayed gas into carb and she fired fine then died out of course. Changed fuel filter last night and injector today, still just cranks.
    Looked in my book and it says how to check the pump and check the fuse that I cant find under the hood.

    I can jump it it seems by the directions but I would like to check the fuse but cant find it. Also there is only one relay I see under the hood on the drivers fender so I am guessing that is the f pump relay?

    Any help is greatly appreciated !!!

  • okay guys.
    my boyfriend owns a 1999 GMC Sonoma and he just recently started having problems out of it. He took his dad to work one day and while waiting he turned the truck off, five minutes later he tries to start it back and it won't do anything. Well, he's changed the fuel pump, checked the wires and many more things but it still will not work. Does anyone know what might be wrong with it? please message me back with anything that you could think of because at this point we would try anything just to get it fixed.

    thanks! : )
  • cudaman70cudaman70 Posts: 1
    edited June 2010
    I have been trying to get a 92 S10 brought back to life for a friend of mine. The latest problem that I have found is the one side if the TBI shuts off for no reason. if I change the plug the problem follows that plug. And it is intermittent as to where it will throw fuel sometimes and then just stop. But it always follows that plug. I have check the wires form the plug to the harness where the wires go the the TBI. Has anyone every seen such a ploblem, and if so what did you do to fix it.
  • gonogogonogo Posts: 879
    The ECM controls the injectors, try to find out if the signal is coming out of the ECM.
  • aburgeaburge Posts: 3
    have 97 S10 replaced fuel pump in april. last nite was running fine. stop at light and died. towed home.. only starts when throttle all way to floor. then runs like only on 1 cylinder real rough. it is 2.2 motor. can hear pump run. replaced filter. once starts will only run couple minutes. dies if you let off throttle. any ideas. money is tight.
  • gonogogonogo Posts: 879
    I would check fuel pressure, then you will know if the the pump is doing it's job. Aftermarket pumps have had a poor history.
  • Hello all,
    Have a friend who has a 1997 chevy S10 with 4.3L. Truck ran fine but my friend heard that fuel pumps went bad around 180000 kms, so he decided to replace the fuel pump even though it worked fine. He bought one off ebay after finding prices high and took to mechanic to install and changed filter aswell. Now truck puffs smoke and runs very rough to the point of stalling. Took back to mechanic to make sure all lines were hooked up and proper and he said it was but probably needs a tune up now. After mechanic changed wires, plugs, pcv, rotor and cap the truck ran the same and mechanic has no idea now. Mechanic says the fuel pump might have been bad. Now my friend is tight on funds and cant really afford another pump and has been using my spare vehicle . Is there any info i can use from anyone on possible problems or fixes and solutions. anything I can check, such as fuel pressure and such and where i would check these things. I just want to get his vehicle back on the road and my truck back in my driveway,lol . Thanks ahead
  • gonogogonogo Posts: 879
    The pump should have warranty, if not, well.
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