1997 Chevy S-10 Fuel Pump Problems

Tiny
JSOLLARS
  • MEMBER
  • 1997 CHEVROLET S-10
  • 4 CYL
  • 2WD
  • MANUAL
  • 92,000 MILES
I replaced the fuel pump and now I don't have 12 volts at the pump. I have checked the ECM fuse and can hear the fuel pump relay come on, but nothing at the fuel pump. I even took the new pump off and put the old one on, which was still working sporadically before I replaced it and it doesn't work either. I read somewhere that the oil pressure switch could be bad, but my manual doesn't show it's location. Is there another fuse somewhere that I can check?
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Tuesday, August 18th, 2009 AT 9:51 PM

9 Replies

Tiny
RASMATAZ
  • MEMBER
Could be the computer fuel pump control of the relay coil side
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Tuesday, August 18th, 2009 AT 9:56 PM
Tiny
JSOLLARS
  • MEMBER
What you are saying is that the fuel pump relay could be bad?
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Tuesday, August 18th, 2009 AT 10:17 PM
Tiny
RASMATAZ
  • MEMBER
Check ECM BATT fuse no.9 20amp if okay check for power at the orange wire on the fuel pump relay socket pin A2

Do a continuity test on the gray wire-from fuel pump connector to the fuel pump relay-

At fuel pump relay socket the dark green and white wire powers the coil side of the relay
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Wednesday, August 19th, 2009 AT 4:10 PM
Tiny
JSOLLARS
  • MEMBER
ECM fuse was good.

12 Volts at terminal 2 on relay socket.

There was no continuity from terminal 2 to the gray wire on the fuel pump connector.

Any further suggestions? Thanks!
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Thursday, August 20th, 2009 AT 4:49 PM
Tiny
RASMATAZ
  • MEMBER
Jumper the fuel pump relay socket orange to gray wire -did the fuel pump come on?


http://www.2carpros.com/forum/automotive_pictures/12900_fp1_18.jpg



http://www.2carpros.com/forum/automotive_pictures/12900_fp2_8.jpg



http://www.2carpros.com/forum/automotive_pictures/12900_fp3_3.jpg

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Thursday, August 20th, 2009 AT 5:02 PM
Tiny
JSOLLARS
  • MEMBER
I jumpered the gray wire and the orange wire, but the pump did not come on.
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Friday, August 21st, 2009 AT 2:27 PM
Tiny
RASMATAZ
  • MEMBER
If the ECM BATT fuse is okay the gray is open from the relay to the fuel pump. Try this direct power at the gray wire on the fuel pump connector did the fuel pump come on?
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Friday, August 21st, 2009 AT 2:31 PM
Tiny
JSOLLARS
  • MEMBER
Hooked wire directly to + on battery and other end to gray on pump, but pump didn't come on. So I ran a short wore to the black ground wire on pump then to the frame and pump came on. I then checked continuity from the black ground wire on pump to frame, but no continuity. I then checked continuity from black ground on relay socket to ground and had continuity. Do I have a bad ground wire from pump connector to?
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Friday, August 21st, 2009 AT 2:55 PM
Tiny
RASMATAZ
  • MEMBER
Do I have a bad ground wire from pump connector to?

Yes you do, rewire to a good/clean ground point-
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Friday, August 21st, 2009 AT 3:17 PM

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