fuel pressure problems need help
Thread Starter
Teching In
Joined: Sep 2015
Posts: 35
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fuel pressure problems need help I tried doing a search and couldn't find anything that really helped if i missed something I apologize but the problem I am having is I recently went from a ls1 to a lq4 and while tuning for the new 6.0 my tuner noticed that my engine wasn't taking fuel when added to it (wasn't getting the fuel) so hooked up a pressure gauge and at idle all I had was 55psi at WOT it dropped to 48psi it was a Walboro 255 pump but at his advice since any pump can go bad I switched to a racetronix pump installed still the same problem only 55psi at idle and at wot drops below 50psi, I don't thing the engine change had anything to do with the problem I had just had the LS1 tuned for a long time and never noticed any issues with it just going to the new 6.0 stumbled upon this. Any help would be great I thought it might have been the regulator but from what I've been told the regulator either works or it doesn't either has too much or none when bad. thanks
When I initially took my car for a dyno tune it was losing fuel pressure at WOT. At idle it was good. At first i thought it was just the pump so I bought and had the tuners shop install a racetronix 255 but it would still lose pressure. For me it ended up being a bad fuel pressure regulator. It's built into the bucket so I just went ahead and bought a delphi oem fuel pump assembly and my problems went away.
