1991 s10 pickup fuel pump shutting off intermediate some times not at all.

30

Asked by Feb 20, 2016 at 07:03 PM about the 1991 Chevrolet S-10

Question type: Maintenance & Repair

I have replaced the fuel pump, the screen, the fuel filter, rebuilt the fuel
pressure switch, and changed the two relays under the hood. When turning
the key forward to start the engine, the pump kicks on and shuts off just like it
should. Turn the engine off and that is when I have the problem. Will actually
kick off for a split second, then kick back on.

6 Answers

83,905

So it's like it is getting power after you turn the key off?

1 people found this helpful.
30

yes it should run for a few seconds when you turn it off but it just keeps running

83,905

Chances are it would be in the ignition switch. Thats what kills all the power.

30

The pump still has to pressurize after the key is turned off. Is there a sensor that senses when the system is pressurized and cuts power to the pump?

83,905

I found a fuel pump cut off switch that they say is on your truck. I wouldn't know where it is, but if you ask at the parts store, they may be able to tell you. Also found that there is a fuel pump relay that would make sense to try.

30

This is an update, the problem has been solved. It was the oil pressure switch. It was showing oil pressure after the motor was shut off so it was sending the message to the computer that it had oil pressure meaning that the motor was running so the fuel pump would not shut off. This is a new one on me, but thanks everyone for all of your help.

Your Answer:

S-10

Looking for a Used S-10 in your area?

CarGurus has 9 nationwide S-10 listings starting at $2,450.

Postal Code:

Chevrolet S-10 Experts

  • #1
    Andrew Olsen
    Reputation
    2,810
  • #2
    John Saffrahn
    Reputation
    1,110
  • #3
    Trebor66
    Reputation
    1,090
View All

Related Models For Sale

Used Ford Ranger
7 Great Deals out of 284 listings starting at $3,975
Used GMC Sonoma
4 listings starting at $4,950
Used Ford F-150
124 Great Deals out of 10,948 listings starting at $369
Used Dodge Dakota
6 Great Deals out of 143 listings starting at $3,495
Used Chevrolet Blazer
14 listings
Used GMC Sierra 1500
86 Great Deals out of 10,982 listings starting at $3,880
Used Chevrolet Camaro
8 Great Deals out of 1,023 listings starting at $4,500
Used Ford Mustang
21 Great Deals out of 1,308 listings starting at $2,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.