Shoaf85

Walbro 255 in tank
4301 external on Hobbs

They have their own lines and y together just before the rail with a check valve on externals line. Gonna try and put a bigger in tank when it's needed.

algZO6

are you logging fuel pressure?

Shoaf85

Yep it holds 80ish all the way through a pass

Smoove

I think if you guys lower your base pressure, you'll get a lot more out of these pumps/injectors. A 4303 doesn't need to be @ 55psi....We're in the 45psi range(also less chance to max out regulator-regulators operate typically between 35psi and 85psi). We'll be testing this out soon enough. I understand if you're doing it for siphon reasons but, other than that reason, I don't see why you would.

JoeyG

Walbro 255 intank (hotwire harness) and a MF 4303 in my car with 8an lines from each pump wye'ing into a 10an line by tank. 10an to rails with 8 an return. Dropping from 54#'s base to 45#'s base lowered my magnafuel pump draw by over an amp as welll as allowed so much room below calculated fuel limits in pcm. But im on pump/meth and racefuel tunes though.

Smoove

Shoaf85

I agree, only reason I was running such high pressure was to get the most out of my injectors. After I put a large enough inj in it I will certainly lower my base to 50ish.

Smoove

word up