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

49 messages,  Last post on Nov 16, 2009 at 1:02 PM

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#38 of 49 fuel pump problem by bbrianb Mar 16, 2009 (8:39 am)
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. Replies to this message: gonogo (Mar 17, 2009 8:18 am)
#39 of 49 Re: fuel pump problem [bbrianb] by gonogo Mar 17, 2009 (8:18 am)
Replying to: bbrianb (Mar 16, 2009 8:39 am) 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.
#40 of 49 FUEL PUMP by streetrodder2 Apr 15, 2009 (5:11 pm)
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?
#41 of 49 fuel guage doesn't work anymore by d_metivier Apr 19, 2009 (7:11 am)
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? Replies to this message: gonogo (Apr 20, 2009 6:56 am) oldiron (Jun 29, 2009 3:27 pm)
#42 of 49 Re: fuel guage doesn't work anymore [d_metivier] by gonogo Apr 20, 2009 (6:56 am)
Replying to: d_metivier (Apr 19, 2009 7:11 am) 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
#43 of 49 Re: fuel guage doesn't work anymore [d_metivier] by oldiron Jun 29, 2009 (3:27 pm)
Replying to: d_metivier (Apr 19, 2009 7:11 am) 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.
#44 of 49 Re: ? [jdinin] by ridetrue Aug 14, 2009 (9:57 am)
Replying to: jdinin (Nov 26, 2008 4:45 pm) 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.
#45 of 49 Re: 2001 S-10 Fuel Gauge [littleosco] by madeupname4 Oct 10, 2009 (1:25 pm)
Replying to: littleosco (Dec 15, 2008 4:22 pm) 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.
#46 of 49 fuel line connection leak by dmartn149 Nov 16, 2009 (1:02 pm)
#47 of 49 fuel line connection leak by dmartn149 Nov 15, 2009 (3:24 pm)
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 Replies to this message: gonogo (Nov 16, 2009 9:11 am) dmartn149 (Nov 16, 2009 1:02 pm)

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