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It turns over but wont start, I replaced the.

Tiny
TREEBEE30
  • MEMBER
  • 1997 GMC JIMMY
  • 120,000 MILES
It turns over but wont start, I replaced the gas tank and fuel pump and still wont start, what could be wrong?
Sunday, February 24th, 2013 AT 12:53 AM

10 Replies

Tiny
HOMER1967
  • MECHANIC
  • 875 POSTS
You have to find out what you are missing, could be spark, fuel pressure, vacum, ect. Can you verify that you have good spark to the spark plugs?These trucks have a lot of distributor cap and rotor issues.
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Sunday, February 24th, 2013 AT 1:39 AM
Tiny
TREEBEE30
  • MEMBER
  • 10 POSTS
Yes its got good spark and it seems to have good fuel pressure, I'm stuck I dont know what to do help please i've been working on it for days
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Sunday, February 24th, 2013 AT 1:51 AM
Tiny
HOMER1967
  • MECHANIC
  • 875 POSTS
What is the fuel pressure, have you checked it with a gauge?Does it have a tachometer? If so does it move when you are cranking it?Also pull the [plugs ans see if they are soaked with gas.
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Sunday, February 24th, 2013 AT 1:58 AM
Tiny
TREEBEE30
  • MEMBER
  • 10 POSTS
Now there is no power to the fuel pump
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Sunday, February 24th, 2013 AT 2:16 AM
Tiny
TREEBEE30
  • MEMBER
  • 10 POSTS
No i've not checked it with a gauge I dont have one but when you push on the valve it spits out gas
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Sunday, February 24th, 2013 AT 2:18 AM
Tiny
HOMER1967
  • MECHANIC
  • 875 POSTS
The pressure and volume need to be measured.
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Sunday, February 24th, 2013 AT 2:59 AM
Tiny
HOMER1967
  • MECHANIC
  • 875 POSTS
Check the fuses and the fuel pump relay, also verify that the fuel pump ground is good
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Sunday, February 24th, 2013 AT 3:00 AM
Tiny
TREEBEE30
  • MEMBER
  • 10 POSTS
Where would the ground be?
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Sunday, February 24th, 2013 AT 3:07 AM
Tiny
TREEBEE30
  • MEMBER
  • 10 POSTS
I checked the relays and fuses
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Sunday, February 24th, 2013 AT 3:08 AM
Tiny
HOMER1967
  • MECHANIC
  • 875 POSTS
The ground would be a black wire at or near the fuel pump harness that most likely goes to the frame and is attached with a bolt or screw.
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Sunday, February 24th, 2013 AT 3:11 AM

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