2000 GMC Sierra Stalling out

Tiny
AYSILVA
  • MEMBER
  • 2000 GMC SIERRA
  • V8
  • 4WD
  • AUTOMATIC
  • 123,000 MILES
Recently my fuel pump went out and I replaced fuel pump, filter and spark plugs on my 2000 Sierra. It was running fine, although I did notice a slight hesitation when going uphill. If you hit the gas peda, l then it accelerated appropriately and went along strongly. Two months later(summer) I was driving for long periods during hot days and it just shut off on me. This has happened three times in the past week and only when I am driving for extended periods. Any help would be appreciated. Thanks.
Monday, June 29th, 2009 AT 3:34 PM

5 Replies

Tiny
BUDDYCRAIGG
  • MECHANIC
  • 2,262 POSTS
Do you have to let it cool off before you can start it again?

That would be a classic sign of part of the ignition system failing.
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Monday, June 29th, 2009 AT 3:35 PM
Tiny
AYSILVA
  • MEMBER
  • 3 POSTS
It seems that the longer you wait, the better your cvhances are of starting car, although, one of the times it stalled it started up within three minutes.
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Monday, June 29th, 2009 AT 3:40 PM
Tiny
BUDDYCRAIGG
  • MECHANIC
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I'm still leaning towards ignition system stuff,

but I also want you to check the connectors that the fuel pump relay plugs into in the fuse box under the hood.
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Monday, June 29th, 2009 AT 4:08 PM
Tiny
AYSILVA
  • MEMBER
  • 3 POSTS
Actually, the onme time it started right awawy was when I pulled off fuel pump relay and replaced it with the horn relay (*same number) and it started right up. Horn still worked also, which told me it was not relay. It still stalled later.
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Monday, June 29th, 2009 AT 4:29 PM
Tiny
BUDDYCRAIGG
  • MECHANIC
  • 2,262 POSTS
The fuel pump relay doesn't go bad.

The connectors in the fuse box, that the spades of the relay plug into.
They get hot and loose their "spring-iness" and don't make good contact with the relay.

It's worth a look.
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Monday, June 29th, 2009 AT 4:36 PM

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