flywheel

iTrader: (2)

Just put a walbro 255 pump, #gca758-2 from summit, in my 6.0liter chevelle, and it's only puttin out 28-30 psi at idle. I changed the fuel reg. on the rail and is the same (trk intake). Checked for kinked lines, fuel filter. all ok. The description for the pump is it's for a 85-92 350ci camaro w/tpi. Is that OK.. My tuner says it needs about 55psi.
The pump had 3 lines off it, one fuel, the other one to return, one to vent.....hmmmmmmm maybe I put the return to the vent one? Any ideas????
Thanks Rick

flywheel

iTrader: (2)

PS.
This is a Buick Gran National tank/sending unit w/ walbro pump....fyi

Rick

flywheel

iTrader: (2)

hmmmmm,someone?

WKMCD

iTrader: (2)

I run the Racetronix kit which uses a Wallbro 255 on my C5. It easily maintains 60lbs with an Aeromotive 1006 regulator.

t72ss402

iTrader: (10)

I beleave the old TPI system runs on 35 psi. So I beleave you have the wrong pump. Your LS series fuel pressure needs to be at 55 psi.

Tim.

70c10

iTrader: (1)

what he said

got-a-ls1

iTrader: (12)

regulator sets the pressure not the pump so pump should be ok. 255 pumps seem to only differ in arrangement of the bottom pickup to fit different buckets. some are offset some are centered.. other then that any 255 pump should all flow 255lph.

im wondering if that "vent" is a venturi setup?

Lonnies Performance

iTrader: (16)

Actually some 255lph pumps are designed around 43.5psi & not higher pressures. Regardless, you should see over 30psi.

Good chance you have an install problem with the in-tank hose.

flywheel

iTrader: (2)

Problem solved, pulled tank and the hose to the pump was loose. Cut another hose and re installed it. waalaa! 75psi unreg press. 55psi regulated.... funny, it runs better now, off to the tuner now..... thanx for the help.....
Rick

t72ss402

iTrader: (10)

Good find. Letb us know how well your tuner gets it dailed in.

Tim.