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You are in the Chevrolet S-10 & GMC S15 Sonoma
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Chevrolet S-10, GMC Sonoma, Truck
#77 of 97 New Fuel Pump Stopped Working?
Sep 10, 2011 (7:23 am)
I have a '98 Sonoma 4.3L. It had a rough idle and took a lot of cranking to start. I replaced the fuel pump which eliminated the cranking prob but not the rough idle. Eventually, weeks later, the truck stalled in the middle of traffic and never started again. I replaced the injector with the upgraded multi-port spider injection unit. The truck came back to life but the rough idle was still an issue (I did clean the EGR valve). The same day, I ended up not being able to start the truck again. This time, it sounds like the fuel pump is not activating. I made sure the fuse was good and I also made sure the fuel pump plug was tight.
Is there any other possible cause for the issue with my new fuel pump? It literally only has a few hundred miles on it. I am planning to blow some air through the fuel lines to see if they are somehow clogged but I have no clue what else could have burned out the pump or if there might be some other issue preventing the pump from activating.
#78 of 97 Re: New Fuel Pump Stopped Working? [platinumr1]
Sep 10, 2011 (7:57 am)
Did you check the pump electrical connector for burning when you replaced the pump.
I believe Delco even sends a repair connector with each pump.
Repair connectors can be purchased at the dealer, maybe aftermarket, not sure.
#79 of 97 Re: New Fuel Pump Stopped Working? [gonogo]
Sep 11, 2011 (6:58 am)
Thanks for replying! Are you referring to the wiring harness? If so, I did change that out with the new fuel pump. If not, I'm not sure I know what you mean.
#80 of 97 Re: New Fuel Pump Stopped Working? [platinumr1]
Sep 11, 2011 (7:52 am)
Yes, pump harness. Another issue could be the ignition switch, the electrical part. Check ECMB fuse for power, it powers the pump on my 99.
#81 of 97 Fuel pump pressure.
Oct 03, 2011 (11:46 am)
My 2003 S-10 (4.3L V6) is not starting. Last time it started it ran fine, I filled the tank drove home and parked it. It sat for a couple weeks without running, and when I went to use it again it did not start. It cranks strong and I could smell gas when I was trying to start it so I decided to replace the plugs and wires. It still did not start, so I sprayed some starting fluid in the throttle body and after cranking a little bit it fired up. I drove it around for 15-20 mins. without any problems. I brought it home and parked it and went out at three different times that night and it fired right up after 1-2 cranks. The next day I tried to use it and it would not start again. Today I went out and got a new fuel filter and a pressure tester, when I turn the key on I hear the fuel pump humming for 2-3 seconds. I replaced the filter and connected up the pressure tester and with the key on engine not running I am getting 52psi on the gauge. Is this enough pressure? I am starting to think ignition module but I saw on the forum that the pressure needs to be at least 55psi so I am second guessing myself now.
Also, when I am trying to start it and it doesn't start, when I let off the key the engine sometimes sputters and bluish smoke comes out of the TB.
Thanks in advance,
#82 of 97 Re: Fuel pump pressure. [nphillips]
Oct 03, 2011 (4:08 pm)
My 2002 S10 4.3L would start hard at times then eventually it would not start without starting fluid. It turned out to be the fuel pump. I took the 8 bolts out that hold the bed on and jacked up the front to tilt in up like a dump truck to access the pump, instead of dropping the tank.
#83 of 97 Re: Fuel pump pressure. [rmdhcoleman]
Oct 04, 2011 (7:08 am)
Ive seen the lift the pump side, first time lift the front, clever.
#84 of 97 Lack of Power to Fuel Pump - Not Fuse
Oct 24, 2011 (10:06 am)
My fuel pump was not activating. I checked all fuses, including ECMB, and all were working well. The wiring is good, the ground is good but the pump will not activate. I read something about Passlock but I am not sure if this is the issue. Any advice?
#85 of 97 Re: Lack of Power to Fuel Pump - Not Fuse [zrokewl299]
Oct 24, 2011 (5:09 pm)
Could be the fuel pump relay under the hood in the fuse/relay center box. You can switch the fp relay with one of the others with the same part number to see if this helps.