Fuel pressure issue

[rickpaw]

Originally Posted by Che70velle

As a suggestion, check your required fuel pressure. If your thinking about going to a mid 90's TBI pump, I'm not sure that would work, as they are 15-18 lb. pumps. The LS engines require almost 60lbs to work properly. I think the later year 96-98 chevy truck "vortec" had more fuel pressure than the TBI engines did, but how much more I'm not sure.

You're right about the fuel pump from the truck. Actually it's from 97 vortec truck (AC Delso EP381). The same one being used by Rick's tanks, besides the Walbro 255 for stock LS engines.

We checked tank venting as well. It has Finch's dual vent set up. When we removed the fuel assembly, there was not any indications that the tank is not venting (ie no whooshing sound).

[rickpaw]

Well, I dropped an ACDelco EP381 in the tank. Hope it holds up in long drives. At least I can get a replacement pump at local parts store if that one fail on road trips. One thing I noticed was that the fuel pressure held steady at 58 psi after I shut the engine off (40 psi after 12 hr period), whereas the fuel pressure would immediately dropped to 0 with the old pumps (Aeromotive 340).