2002 S10 Change Fuel Pump, Oil Sensor and Relay but no Power to FP. - S-10 Forum
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2002 S10 Change Fuel Pump, Oil Sensor and Relay but no Power to FP.

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Old 10-26-2011, 12:57 AM   #1
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Angry 2002 S10 Change Fuel Pump, Oil Sensor and Relay but no Power to FP.

I re Posted this in the Correct S10) Forme Sorry.
Hello You all I am a LONG TIME Reader 1st time post.
I have a 2002 S10 260,000 Miles.
I have always had fuel problem it seems. I put my 3rd Fuel pump in with in 5 years But this time still won’t start so I changed the Relay AND THE Oil Sensor Switch (Under the distributer cap.) It started up great 3 times and I let it set to charge the battery. And then Won’t start I disconnected the battery and let it set for 4 hrs
Still No power to the fuel pump.
When I turn the key I can here bubbling and hissing from what I think is the flue sending module. It sounds like it is waiting for the fuel??
Please any help would be great
Old 10-26-2011, 01:40 AM   #2
i saw what you did there!
 
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Re: 2002 S10 Change Fuel Pump, Oil Sensor and Relay but no Power to FP.

well it may be low voltage problem to the pump


the wire along frame rail to the pump may be damaged and too muh resistance and it does happen on the first gens as well i have had to repair this issue on quite few trucks of both gens

on most of them somewhere between the relay and the pump is where the wire goes bad and so full 12 v doesnt make it to the pump

since you hear the pump run at key on run position

does it run for a couple seconds only then stop?

it should

if the sound is constant and doesnt stop within a couple seconds then it cant be the pump then

becuase it is timed by the pcm signal to the relay

to just prime the fuel system, build up the pressure for those couple seconds only just before cranking the engine

bubbling?

air in the system?

hmm...
Old 10-26-2011, 12:15 PM   #3
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Re: 2002 S10 Change Fuel Pump, Oil Sensor and Relay but no Power to FP.

The pump gets No Power at all. The relay has power and when I disconnect the Oil Sensor The oil gage max out and still no power.

I am going to CUT a 7 in x 7 in hole in my Bed today. I am just tired of dropping the tank I will hedge it and put a little tab and make it nice
Old 10-26-2011, 02:08 PM   #4
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Re: 2002 S10 Change Fuel Pump, Oil Sensor and Relay but no Power to FP.

you may have the main power wire somewhere grounding so i would start at the fuse box going down the wire testing for power until you find the spot were it stops but you could also have a bad wire or melted wire under the fuse box.
Old 10-26-2011, 03:57 PM   #5
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Re: 2002 S10 Change Fuel Pump, Oil Sensor and Relay but no Power to FP.

I have power at the Relay. But no power At the FP plug. I have to cut in to the hoarness to check it?
Could their be a different component that will cut the power to the Pump other then the Oil Sensor.
I am about to drill from under the Bed to cut out a panel for easy axises to the pump.
(I just was married in L.V. Saterday 10/22/11.) At Viva Las Vegas on L.V. Blvd
Old 10-26-2011, 06:37 PM   #6
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Re: 2002 S10 Change Fuel Pump, Oil Sensor and Relay but no Power to FP.

Could have the Oil Sensor faled so fast , 15 min?
Old 10-26-2011, 09:20 PM   #7
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Re: 2002 S10 Change Fuel Pump, Oil Sensor and Relay but no Power to FP.

Fuel Gage has 12V but nothing for the gray. The panel I cut for easy axises works great. another 8 hrs down the drain. 2 weeks with no Truck. something else must be the problem..
Old 10-26-2011, 11:55 PM   #8
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Re: 2002 S10 Change Fuel Pump, Oil Sensor and Relay but no Power to FP.

Others have lifted their bed to access the fuel tank..
They removed the front bolts and loosened the rear bolts and tilted and blocked the bed.
Old 10-27-2011, 02:32 AM   #9
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Wink Re: 2002 S10 Change Fuel Pump, Oil Sensor and Relay but no Power to FP.

Quote: Originally Posted by lmleck
Others have lifted their bed to access the fuel tank..
They removed the front bolts and loosened the rear bolts and tilted and blocked the bed.
The little trap door works GREAT
Old 10-27-2011, 05:11 PM   #10
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Re: 2002 S10 Change Fuel Pump, Oil Sensor and Relay but no Power to FP.

Problem Solved
 
The priviest person that installed the Fuel pump back before I received the truck spliced the weirs down the harness and taped them up and put the protective harness cover over them.. The connections failed. It could have happen when I re installed the gas tank and the harness was smashed/damage in another way But the trap door I cut will prevent that from happening again.
Old 10-27-2011, 05:14 PM   #11
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Re: 2002 S10 Change Fuel Pump, Oil Sensor and Relay but no Power to FP.

Quote: Originally Posted by occruzer
The little trap door works GREAT
I think i would have dealt with taking the bed off instead of cutting holes out of the bed
Old 10-27-2011, 07:09 PM   #12
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Re: 2002 S10 Change Fuel Pump, Oil Sensor and Relay but no Power to FP.

You can also take the driver's side bed bolts out,loosen the pass. side,and then tilt up the bed on the drivers side,and put some wood under it.
Old 10-27-2011, 07:45 PM   #13
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Re: 2002 S10 Change Fuel Pump, Oil Sensor and Relay but no Power to FP.

000
Old 10-27-2011, 07:48 PM   #14
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Re: 2002 S10 Change Fuel Pump, Oil Sensor and Relay but no Power to FP.

Here is a wiring diagram I hope this helps should be able to trace the problem.
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2002 S10 Change Fuel Pump, Oil Sensor and Relay but no Power to FP.-graphic.jpg  
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