When I did my 6.0 install I didn't have the FPR hooked up to the vacuum line, reg went bad after a few weeks and fuel pressure was ~58 psi. Shortly after replacing it, found where to hook up vacuum line pressure is ~44 psi at idle and might get to 50 psi under throttle. The problem is with the vac line hooked up it doesn't run nearly as strong as with it unhooked. Any ideas on whether to do something to the fuel return or what?
'86 Silvy- '06 6.0/4L80E, K&N, 2.5 X-pipe Magnaflows, 20" Foose Wheels, Auburn Pro, 3.90 Richmond Gears, and the list is growing!!!
Is the FPR adjustable? You could try turning up the base fuel pressure with the vacuum line attached. If you're running a return style system you should use the vacuum line. IIRC, factory fuel pressure is about 50psi at idle and about 58 at zero vacuum (WOT).
2006 GTO M6 Brazen Orange
2006 Silverado CCSB Duramax
It's a stock FPR non adjustable, seems to be a big difference at 58 psi
'86 Silvy- '06 6.0/4L80E, K&N, 2.5 X-pipe Magnaflows, 20" Foose Wheels, Auburn Pro, 3.90 Richmond Gears, and the list is growing!!!
Most of the stock ones are adjustable. You sure there's not a torx bit screw on there that you can adjust?
2006 GTO M6 Brazen Orange
2006 Silverado CCSB Duramax
Doesn't look like there is one, didn't take it apart or any thing, but I picked up a new today thinking that might be the problem and I looked at it and there isn't any screws.The whole thing just clips to the fuel rail.
'86 Silvy- '06 6.0/4L80E, K&N, 2.5 X-pipe Magnaflows, 20" Foose Wheels, Auburn Pro, 3.90 Richmond Gears, and the list is growing!!!
Weird, my stock one had an adjustment on it.
2006 GTO M6 Brazen Orange
2006 Silverado CCSB Duramax
on the outside of the FPR?
'86 Silvy- '06 6.0/4L80E, K&N, 2.5 X-pipe Magnaflows, 20" Foose Wheels, Auburn Pro, 3.90 Richmond Gears, and the list is growing!!!
Yeah it was on the front part that sticks out.
2006 GTO M6 Brazen Orange
2006 Silverado CCSB Duramax
what yr was it on?
'86 Silvy- '06 6.0/4L80E, K&N, 2.5 X-pipe Magnaflows, 20" Foose Wheels, Auburn Pro, 3.90 Richmond Gears, and the list is growing!!!
Are you throwing any codes?
I'm throwing P0332.
Do you have a fuel rail from a 97-98 vette?
If so I have the same setup and having similar problems.
I have ask the same question on all the forums...vacuum or just air and nobody has a clear answer.
I hope we can get an answer.
The regulator is not adjustable.
1997 GMC RCSB
LS6/T56
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