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

50

Asked by Mhtrapper 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

223,765

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

5 people found this helpful.
223,765

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

1 people found this helpful.
50

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?

223,765

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.

50

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.

2 people found this helpful.

Your Answer:

S-10

Looking for a Used S-10 in your area?

CarGurus has 2 nationwide S-10 listings starting at $12,975.

Postal Code:

CarGurus Experts

  • #1
    Andrew Olsen
    Reputation
    9,840
  • #2
    Robert Smith
    Reputation
    3,410
  • #3
    Gene Arnett
    Reputation
    2,820
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Ford Ranger
14 Great Deals out of 1,454 listings starting at $2,888
Used Ford F-150
304 Great Deals out of 15,343 listings starting at $1,954
Used Dodge Dakota
19 listings starting at $4,394
Used GMC Sierra 1500
131 Great Deals out of 6,881 listings starting at $3,975
Used Chevrolet Blazer
17 Great Deals out of 828 listings starting at $21,977
Used Chevrolet Camaro
24 Great Deals out of 344 listings starting at $10,500

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. Content will be removed if CarGurus becomes aware that it violates our policies.