New FAST EFI system

[Mkelcy]

Originally Posted by tones2SS

I guess my next question would be, would it still run properly with the "switch-over"? Sounds like you said about the EFI not liking the interruptions in fuel supply. Thanks for the info!!!

EFI systems require much higher fuel pressures than carbs. LT1's (and the Holley Commander 950 that I use) like about 44 lbs, factory LSx's are up in the low 60's. In an EFI system, there's no fuel bowl as there is with a carb, so any interruption in fuel pressure is immediately felt in fuel starvation to the engine. Becuase they have the fuel bowl, carbed systems can tolerate the fuel supply pickup momentarily sucking air in a low fuel conditions, not so much with an EFI system. As a result, fuel tanks intended for EFI applications are at a minimum sumped, and should also be baffled to keep fuel around the fuel pickup at all times. In addition, because electric fuel pumps are noisy, most fuel tanks intended for EFI also have internal fuel pumps.

The best deal I've seen on a sumped, pumped EFI fuel tank is the Spectra tank: http://www.rockauto.com/catalog/cata...MIUM%2BGM32AFI. Although it's not specified, my guess (and that's all it is) is that the pump in this tank is of the 44 lb. variety.

I don't know if I answered your question.