Dropping fuel pressure

Reply Subscribe

Thread Tools

Search this Thread

Nov 8, 2011 | 07:42 PM

BTLD_LS1

Thread Starter

11 Second Club

iTrader: (1)

Joined: Sep 2006

Posts: 131

Likes: 0

From: San Antonio

Dropping fuel pressure

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?

Nov 9, 2011 | 08:04 AM

Old Geezer

TECH Senior Member

iTrader: (3)

Joined: Jun 2004

Posts: 5,639

Likes: 71

From: GA, USA

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"....

Reply Subscribe