You should be able to install the new FPR in the return hose and make the pressure higher. There must be something wrong with the flow if you get sown in the 20's range WOT. I think some have had problems with the plug not making a good connection. Maybe try swapping some relays around. Run a hot wire directly to the regulator ass'y. Check your ground on the sending unit.
Last edited by GMCwantsLS1; 09-26-2007 at 06:55 AM.
2006 Superior Blue Trailblazer SS AWD, Stock as a rock
Sold: 2002 GMC Sportside Denali front end with a 2002 LS1, FLT level 5, Yank 2600, Trick Turbo, T76, Nelson intercooler, 60LB injectors, Warbro fuel pump, Eaton locker, Magnaflow, 3.42, Nelson Performance Tuning (speed density).
Sold: 1981 GMC LB RC 1500 2002 4.8L 4L60E 12 bolt 3.73 Richmond Lock Right AC PS Nelson Performance tuning
6 months ago I had a low fuel pressure problem.... 48psi @idle and 56ish with no Vac to the Reg... Installed a 255 pump and Hotwire kit... SAME thing... I removed the bucket about 5 times and kept looking for a problem replaced the regulator,filter, everything ... still had pressure drop... put a scanner on it and found 110% duty cycle.. that was with 10 fuel injectors.... So I ditched that stuff.. installed 60lb motrons fuel pressure its 56@ idle no Vac on reg and half a tank of fuel ... top of first it starts to drop off... back up to 56 on the Shift .. then back down .. soon as its hits third its a dead horse ! getting down into 20-25ish !!!!!! How do you Gut out a stock fuel pressure Reg? I have a aeromotive adjustable reg .. what happens if i clap off the retun line and see what happens??.. hell i might even drive it down the road and see if it helps anything
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