CHEVY FUEL PUMP PROBLEMS

1999 Chevrolet S-10

Tiny

martini77

September, 9, 2008 AT 8:06 PM

Electrical problem
1999 Chevy S-10 4 cyl Two Wheel Drive Manual 100k+ miles

I have checked all the fuses in the fuse box and they are working fine, but I am only getting 5volts to the fuel pump at the tank. Is there another relay that I need to check? If so where is it and how do I check it? If that is not the problem what is?

FOUND 10189 RELATED QUESTIONS

16 Answers

Tiny

rasmataz

September, 9, 2008 AT 8:31 PM

Test the fuel pump relay or swapped it for a known good one its located in underhood fuse block.

Tiny

martini77

September, 10, 2008 AT 4:40 PM

Swapping out the relay did not resolve the issue. When I turn the key I get 12V to the pump for a brief period, but the pump does not activate. What can I try next.

Tiny

rasmataz

September, 10, 2008 AT 9:50 PM

Power the pump direct from the battery and tell me what happened.

Tiny

martini77

September, 11, 2008 AT 5:50 PM

I connected another battery to the pump and it starts working, could it be the connector at the pump?

Tiny

rasmataz

September, 11, 2008 AT 6:32 PM

Could be the connector test it or an open wire on the gray going back to the fuel pump relay.

Tiny

martini77

September, 15, 2008 AT 4:59 PM

Well, I charged the battery replaced the connector at the pump. Using the new splices I checked the voltage at the wires. The combination that powers the fuel pump does not get any voltage to it. All the other combinations of wires get 12v for a second or two when the key is turned on, then all go to zero v except the purple/orange combination which gets 1.27v all the time. What can I try now?

Tiny

rasmataz

September, 15, 2008 AT 5:27 PM

All the other combinations of wires get 12v for a second or two when the key is turned on, this happens bcuz the relay de-energizes

Test the ground wire to the pump-

Tiny

martini77

September, 16, 2008 AT 8:16 PM

Sorry to sound stupid, but I don't have a clue when it comes to auto electronics. How do I check the ground wire to the pump?

Thanks

Tiny

rasmataz

September, 16, 2008 AT 9:28 PM

I connected another battery to the pump and it starts working, could it be the connector at the pump?

If it comes On then the ground is good.

Tiny

martini77

September, 17, 2008 AT 4:24 PM

With the key on I connected another battery to the connections that power the pump, and it turned on. So that means it is grounded, right? What can I try next? Thanks for the help.

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