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Engine will not crank after replacing fuel pressure regulator

Tiny
TRESGREN
  • MEMBER
  • 1997 CHEVROLET 1500
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 225,000 MILES
A friend of mine replaced the fuel pressure regulator on my truck, put it back together and now the engine literally will not turn over when the key is turned.
Tuesday, July 31st, 2018 AT 7:53 PM

8 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,170 POSTS
Hi and thanks for using 2CarPros. Com.

Can you tell me what happens when you turn the key? Is there any noise?

Let me know.

Joe
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Tuesday, July 31st, 2018 AT 9:10 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,170 POSTS
After thought. See if you can turn the engine by hand. If you cannot remove the spark plugs and try. I question if he filled the cylinders with gas. Check to see if the engine oil smells like gas. I attached a picture of the regulator. Did he put everything back together with it correctly?
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Tuesday, July 31st, 2018 AT 9:16 PM
Tiny
TRESGREN
  • MEMBER
  • 4 POSTS
Hi, thank you for your prompt reply. I am sorry that it has taken me this long to check it out an get back to you. Yes, there was "gas" in the front most cylinder on the drivers side. (Sort of smelled like gas) So, now it does turn over but will not start. Apparently he did not unplug the battery the first time around. It looks like I will have to fix a couple wiring connections tonight after work.
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Monday, August 13th, 2018 AT 12:45 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,878 POSTS
This means the regulator is leaking or the spider is bad. I only use AC Delco for this repair because I have tried other parts they do not work.

Will the truck run on starting fluid?
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Thursday, August 16th, 2018 AT 3:48 PM
Tiny
TRESGREN
  • MEMBER
  • 4 POSTS
I checked the rest of the cylinders-plugs and about half (four) of them had gunk on the plugs, so I cleaned those up. I believe there might have been a short in the wires on the crankshaft position sensor (all three wires were bare and touching. Plus really oily). Last but not least there was a blown fuse. So now it starts-runs. Except now there is a really loud suction noise coming roughly from the area that the fuel lines attach? It would not be the fuel lines because I would have gas everywhere?
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Saturday, August 18th, 2018 AT 5:57 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,878 POSTS
Yep, there is a seal that goes back there to stop vacuum from leaking. Can you take the upper intake back off to inspect? Here are diagrams to help. Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.

Cheers, Ken
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Monday, August 20th, 2018 AT 8:59 AM
Tiny
TRESGREN
  • MEMBER
  • 4 POSTS
For starters I have to apologize for my stupidity on this. The suction noise was coming from the fact that the vacuum hose going to the brake booster did not have its hose clamp. So the next thing I did was borrow a fuel pressure gauge from the parts store. Since my original problem was still there. This is what it read: turn key on- 58 psi for two seconds then 20 psi, start engine 52-54 psi, then sometimes it drops into the twenties and shuts off. I assume that means the fuel pump is the culprit?
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Thursday, August 23rd, 2018 AT 2:58 PM
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello, I am Danny-

Yes, it sounds like your fuel pump is on its way out. It should maintain 50-60 P.S.I at all times. To gain access to the in-tank pump you have to remove or drastically tilt the truck bed to gain access. Hope this helps and thanks again for using 2carPros.
Danny-
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Thursday, August 23rd, 2018 AT 7:08 PM

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