1993 Chevy S-10 Wierd fuel pump problem

Tiny
MUSKRAT91
  • MEMBER
  • 1993 CHEVROLET S-10
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 214,000 MILES
I have a 1993 S10 pickup. It has the 4.3 A/T 4x4. The truck has 214K milse on it and has been ultra dependable until about two weeks ago. I drove the truck approx 30 mi. Stopped in a parking lot when I went to leave it would not start. The fuel pump was not running. OK so I am there for about an hour foolong with the relay & the wirtes checking them over and suddenly it decides tyo run. I drove it home shut it off and then it would not start. I replaced the oild pressure switch, the pump relay, and the distributor (the shaft had excessive wear & play in it). The truck ran great for about for days then the same thing drove it about 30 miles shut it off & was at the place for about 2 hours came back out & again no fuel. The pump is approx 3 years old from NAPA & the sending unit is less than a year old it was a new GM part. The ECM is sending power to the pump even when the pump does not run. The grounds are all tight so could it be a problem with the new sending unit or perhaps the pump getting weak? I am stumped on this one. PLease help.

Update. I have tried running power directley from b the battery both with the trucks test lead and by fabing one myself. The pump will come on sometimes but not always. Almost like it has a bad ground, but the they are clean & tight. I think it must be some problem in the tank with either the pump or the sending unit. Just can't figure it out and did not want to pul the tank out without knowing for sure. Thanks for all the help so far.
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Monday, June 23rd, 2008 AT 3:13 PM

5 Replies

Tiny
DOCFIXIT
  • EXPERT
Your are getting power to pump connector at the tank? The pump does not run I conclude you need a new pump.
Good luck
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Monday, June 23rd, 2008 AT 3:22 PM
Tiny
RASMATAZ
  • MEMBER
Try direct power from the battery to the fuel pump and see what happens
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Monday, June 23rd, 2008 AT 3:23 PM
Tiny
MUSKRAT91
  • MEMBER
Yea I have power at the tank but it only runs when it feels like it. Acts like a bad ground, but they all look good. I have updated the post with more info. Thanks for your help.
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Monday, June 23rd, 2008 AT 3:30 PM
Tiny
CHEVYJOE
  • MEMBER
Retry running the fuel pump directly to bat. Ir this works, just cause your ground and power wires look good, doesnt mean the wires inside, that u cant see arent cracked. My truck had a similar problem. I do alot of trail riding and those bumps and what not do alot to your wires. Try replacing your fuel pump ground and wires. Alot of s10 owners have this prob. Most of my friends have anyway. Hope this helps. Let me Know
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Monday, January 12th, 2009 AT 2:09 PM
Tiny
JEREMY
  • MEMBER
I am also having a simialar problem no power going to the pump pump is brand new just replaxced it as a result of the loss of power and am so stumped grounds were a little rusty but I have tried multiple places on the underbody for a better ground connect. No luck please help someone
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Tuesday, December 21st, 2010 AT 11:26 PM

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