I am getting mixed reviews while searching this. I have a 07 classic flex fuel truck. I got some fast 60# injectors and i am currently running a .3 bar spring in my wg. That is only 3.5 psi but i have a .5 bar that is 7.25psi that i would love to use with my stock pump cause there is nothing wrong with the pump and supposedly its a larger pump........
so my question is how much larger is the flex fuel pump than the stock and compared to a walbro or bosh where does it stand. Will it fully support a 6.0 with 60# injectors on 7psi of boost?

 

John at Fuel Injector Connection said that the stock Flex Fuel pump (at least for my 03) flows about 250 gph.

 

That flexfuel system works like **** I had a 06 silverado it always ran 12 to 1 air fuel ratio nobody could figure it out and then I flipped it 3 times down the innerstate passing a semi in rain doing 70 RIP!

 

Does this mean it works good?

 

only way to know is gonna be to monitor fuel pressure to see if it is staying steady.

 

I am running a 427 TVS2300 with 12 psi spraying thru 60#'s thru a factory flex fueled system (return style) myself.

Should work for you.

 

The Magnuson tuner and techs I spoke with told me that they like the flex fuel pumps for there higher capacity vs. the stock fuel pump. They do not require a booster pump. Flex fuel systems operate around 8 psi lower than stock but also come with larger fuel injectors. The flex fuel injectors in my truck are 38 psi vs stock injector (I believe) of 24 psi.. The Maggie 112 flex fuel unit doesn't include injectors or a booster pump as they feel the flex injectors and flex fuel pump are sufficient for this size model.