ak2007r6

iTrader: (1)

Flex fuel pump will hand 8lbs just fine.

13Sierra6.2

Will the flex fuel pump keep up with 8ibs and on E85 thats what im worried about?

Byrdman11

iTrader: (1)

Im not sure. Im going to build a duel pump setup to run e85.

ak2007r6

iTrader: (1)

Don't have experience with E85 so can't confirm that but it's keeping up with 11-12 lbs on 90 octane.

The only thing I notice on my truck is at WOT from a dig my fuel pressure take a decent hit at the top of 1st gear but after that it holds strong and high.

Even when the fuel pressure dips my IDC and AFR are rock solid so im not to worried. It just shows that the pump has a difficult time keeping up with the task. The PCM makes up for it by adding pulse width.

13Sierra6.2

Good info ok maybe i'll try running on 93 octane first then switch it over to E85 and see if its gonna keep up. Usually when running E85 i think i will need 20 to 30% more fuel. Your mod list is pretty long so if your running the flexfuel pump then i should be okay for a while.

Area47

i doubt it.

i was at 86% idc with a afr of 12.5 and 424 to the tire on a fbo cammed 6.2

13Sierra6.2

Sounds like you were on stock injectors?? i Have 85ib injectors already installed. Im just worried the pump won't keep up with the injectors.

Area47

stock injectors.

one way to find out!

ak2007r6

iTrader: (1)

Oh, I should have mentioned that my results I mentioned above were with the ID850's listed in my sig.

Stock injectors, no clue how far they will take you

13Sierra6.2

I seen those in your sig, i am also running the ID850s. I already installed my injectors to eliminate any tuning issues when the turbo goes on.