Fuel Pressure drop causing lean problems?
Thread Starter
Teching In
Joined: Apr 2005
Posts: 10
Likes: 0
Fuel Pressure drop causing lean problems? I'm running a walbro 255 with the corvette filter/regulator but only getting 55lbs at the fuel rail at idle dropping to 50 when I blip the throttle hard.
I've been experiencing some lean backfires and flatspots/hesitation in the mid throttle and am wondering if it's because of the fuel pressure.
All the numbers I've seen on LS1Tech are 60lbs at idle and 58 under hard load.
If this is the case could my drop in pressure be enough to cause the issue?
Is the corvette non-adjustable regulator a bad idea?
Thanks for any advice.
Steve
I've been experiencing some lean backfires and flatspots/hesitation in the mid throttle and am wondering if it's because of the fuel pressure.
All the numbers I've seen on LS1Tech are 60lbs at idle and 58 under hard load.
If this is the case could my drop in pressure be enough to cause the issue?
Is the corvette non-adjustable regulator a bad idea?
Thanks for any advice.
Steve
TECH Resident
Joined: Oct 2004
Posts: 800
Likes: 1
From: Simi VAlley,CA
Steve, my fuel pressure has always been at 55, drops to about 50 off idle and I have no running problem. In fact it runs and accelerates VERY well with over 25 MPG! You could have an injector laying down or even a MAF dropping off but I doubt if it's a fuel pressure problem. I know everyone says you have to have 60/58 PSI but in the 6000 miles I've had my hot rod running, (which includes a few passes at Los Angeles County Raceway), it has not caused a problem. The Corvette regulator/filter works perfectly on thousands of Corvettes so unless you have a bunch of mods, you should be fine.
