1993 Chevy S-10 Fuel pump not working

Tiny
NOVACLONE
  • MEMBER
  • 1993 CHEVROLET S-10
Engine Mechanical problem
1993 Chevy S-10 6 cyl Four Wheel Drive Automatic

1993 s-10 Blazer, 4.3 code w, the fuel pump isn't running at all. It completely quit running a few times as if you just shut the key off, and now the fuel pump doesn't run even with the switch on. It will start and run with a shot of starting fluid and then die. The pump doesn't make a sound at all. The fuel pump relay can be heard clicking when cycling the key switch.I cleaned off the ground connection and even tried to ground to a different spot on the frame with no luck.I unplugged the electrical connector and and checked voltage with turning the switch on and got 12.8 volts after you heard the fuel pump relay click. I tried running a positive wire and negative wire from a car battery to the 2 prong connection off of the fuel pump and got nothing, that is if even that was even a right way to get it to work?The pump was put in about a year and half ago and maybe had 3,000 miles on it and had a full tank of gas put in right before this started. The engine only quit running agout 4 times before the fuel pump would not run. How is the relay tested properly to see if it is working? Thanks.
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Monday, December 7th, 2009 AT 5:00 PM

7 Replies

Tiny
RASMATAZ
  • MEMBER
Hi novaclone and TY for the donation

If you're directing battery power to the fuel pump on the gray wire and the ground side of the pump is good-the fuel pump is defective

Getting voltage at the Fp connector before the Fp relay de=energizes should prime the fuel system and fire up
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Monday, December 7th, 2009 AT 5:09 PM
Tiny
NOVACLONE
  • MEMBER
I dropped the gas tank and removed the fuel pump.I then disconnected the electrical connector at the the pump itself and ran jumper wires directly to the pump and the pump worked.I then reconnected the electrical plug back on the pump.I went back to the electrical connector where the power plugs into the fuel pump harness and ran a positive jumper to the gray wire side and a negative jumper to the purple side of the connector and then grounded that to the pump itself and nothing worked. Now I pulled the connector from where it plugs into the top of the pump that has 2 black wires, 1 red wire, and a blue wire.I ran a positive jumper to the red wire on the connector and a black jumper to the black wire on the connector and the pump ran.I then plugged everything back together, and power back to the original harness connector and the pump ran. Is there a chance that it had a little corrosion the connector that plugs into the top of the pump? And do you think I should change anything anyway?The pump runs now that I have disconnected all connections and put everything back together.
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Tuesday, December 8th, 2009 AT 10:08 PM
Tiny
RASMATAZ
  • MEMBER
Go back to the harness/connectors and clean them good and use anti corrosion treatment on it-
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Tuesday, December 8th, 2009 AT 10:13 PM
Tiny
NOVACLONE
  • MEMBER
Got everything back together and starts and runs great but now the gas gauge reads full all the time and I only put about 12 gallons of gas in it, now what did I do?
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Wednesday, December 9th, 2009 AT 10:45 PM
Tiny
RASMATAZ
  • MEMBER
When you remove the fuel pump -did you hook everything back inside-start wiggling connectors around and see what happens-My problem here I cannot provide you the color of the wire that goes to the sending unit its not in Mit1
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Wednesday, December 9th, 2009 AT 10:57 PM
Tiny
NOVACLONE
  • MEMBER
Gray and purple are the fuel pump wire harness colors and 1 blue wire ran to the sending unit, 1 red and 1 black directly to the fuel pump, and 1 black grounded to the bottom side of of the pump top. Is it possible I got the connector on backwards to make it do this and still run?
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Wednesday, December 9th, 2009 AT 11:07 PM
Tiny
RASMATAZ
  • MEMBER
Possible but the connectors should only fit one way when inserted-double check connections again
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Wednesday, December 9th, 2009 AT 11:12 PM

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