BTLD_LS1

iTrader: (1)

I am running the Granatelli 255 pump which I believe is just the Walbro sold under their name. I have been running E85 for about a year now and noticed that under load the car started to go lean. I hooked a fuel pressure gauge up to the car and took it for a drive today.

At idle / small load the gauge showed 55-58 psi
Part throttle 50-55 psi
WOT would drop to about 32 psi

Has anyone else had a similar issue with this pump?
Should I be replacing the fuel rails?
Any suggestions on a replacement setup?

Old Geezer

iTrader: (3)

Start by inspecting the filter, and the rubber lines. [If any]. drop the tank, and take a look.
I see lots of crap in the filter baskets of the injectors I clean, when run w/ "corn gas"....