i hate to bring up an old thread.
i did the install, walbro pump, fittings from summit, relay, hose,
and not one damn bit of diffrence, fuel pressure is still the same.
idol, 43, freeway speed 48, wot 55.
where are you guys getting these high pressure readings.
wish i was seeing 50 at idol, 60 at highway and 67 at wot under boost.

i set it up right, i wired it right, flow is in the right direction, tested it, we have power,
we have a good ground, it is running, and no increase in fuel pressure.
filter was replaced 2 months ago when i had my oil changed.
so tell me did i just waste $200.00 on this ****?

 

My Tahoe has lower reading than most as well. I think it has to do with the Flex Fuel system. Is yours a FF truck? (Z is the 13th digit of the vin, I think)I see 44psi @ idle
50 at part
and 60 at WOT

 

no mine is a 2000.
i got it before they started the flex fuel stuff.
i do have 42 lbs injectors.
but still i should see something.
it runs better, it has more pick up, it's quicker when i floor it.
my gauge could be off, need V8 to plug in and log it to see if it reads diffrent.