Hi Guys,
I have just upgraded my LPFP to a stage 1 in line in tank (walbro 255lph). Anyway I did it because I was dropping down to 49psi at WOT and the rail was draining. It solved the issue however, to start with after the upgrade I was holding 73psi all the time. Fast forward a month and now I'm back down at 60-66psi at WOT or idle. Rail pressure is all good but I don't understand why its not giving me the 72-73 psi I'm supposed to get especially at WOT.
When I do a cold start it will give me 73psi for about 10 secs then it backs off to 66psi as if the fuel pump controller is slowing the pump down. I have yet to test the voltage. I don't think it can be the new pump since it primes to 73psi OK and runs fine for 10 secs.
Any suggestions what is going on? I'm more worried about the WOT situation as its dropping to 60psi so any more boost and I will probably drain again.
Does anyone else see the pressure going lower a than 72psi with an upgraded pump, could this be normal?
Should also mention I reset the Hpfp adaptations as suggested on other posts but never made a difference.
Thanks
I have just upgraded my LPFP to a stage 1 in line in tank (walbro 255lph). Anyway I did it because I was dropping down to 49psi at WOT and the rail was draining. It solved the issue however, to start with after the upgrade I was holding 73psi all the time. Fast forward a month and now I'm back down at 60-66psi at WOT or idle. Rail pressure is all good but I don't understand why its not giving me the 72-73 psi I'm supposed to get especially at WOT.
When I do a cold start it will give me 73psi for about 10 secs then it backs off to 66psi as if the fuel pump controller is slowing the pump down. I have yet to test the voltage. I don't think it can be the new pump since it primes to 73psi OK and runs fine for 10 secs.
Any suggestions what is going on? I'm more worried about the WOT situation as its dropping to 60psi so any more boost and I will probably drain again.
Does anyone else see the pressure going lower a than 72psi with an upgraded pump, could this be normal?
Should also mention I reset the Hpfp adaptations as suggested on other posts but never made a difference.
Thanks