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1997 GMC Truck fuel pressure regulator

Tiny
AEMDE
  • MEMBER
  • 1997 GMC TRUCK
  • V8
  • 4WD
  • AUTOMATIC
  • 150,000 MILES
Yesterday I changed the fuel pressure regulator under the plenum in order to solve a fuel pump issue of it running constantly

When I started the truck, it ran rough for two seconds and then quit.

When I attempted a re-start, the engine would not trun over, as if it is locked up.

After waiting a few minutes, it turned over for one second then made a bang, and locked up again.

This am I tried to start it and it turned over for 1/2 second then locked up. Now it just makes a very load clunk when the starter is engaged.
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Saturday, July 4th, 2009 AT 8:42 AM

6 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Hello, make sure the battery has a full charge and the cables are ok. If you think there might be an internal engine issue, Try to turn the crank by hand. It might be overkill, but, if you disable the ignition, pull the plugs and accessory belt/s, the crank might be easier to turn.

If the pump runs all the time, with key off, check the oil pressure switch.
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Saturday, July 4th, 2009 AT 9:00 AM
Tiny
AEMDE
  • MEMBER
  • 4 POSTS
I removed all plugs, and gas ran out of #'s 5 & 7 cyls. More from 7.

So I had a hydralic lock.

Obivously the new fuel pressure or fuel pump regulator that I changed is defective, or I installed something incorrectly.

Any ideas as to why fuel is running into #7 cyl constantly?

Someting I did, or a wrong part?

Thanks
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Saturday, July 4th, 2009 AT 10:44 AM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Maybe there is an injector problem, on those cylinders. After you fix the problem, you probably need to change your oil and filter, maybe more than once. Plugs also.
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Saturday, July 4th, 2009 AT 12:29 PM
Tiny
AEMDE
  • MEMBER
  • 4 POSTS
Just a note to say thanks for your help.

When I pulled the plenum I found the regulator laying on the intake. Seems I did not installl the retaining clip properly, and when the system built pressure, it simply blew it out.

Truck runs fine, and the fuel pump is not running constantly, so the regulator solved the orginal problem.

There was an issue with the engine compartment on fire. But I will save that for another time.

Andrew
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Sunday, July 5th, 2009 AT 10:46 AM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Well, sorry about the fire. Sounds like you found the problem?
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Sunday, July 5th, 2009 AT 11:51 AM
Tiny
AEMDE
  • MEMBER
  • 4 POSTS
Yep, all fixed, Thanks.
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Sunday, July 5th, 2009 AT 4:16 PM

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