[Danhui955]

So I have a 2009 335i my fuel pump and control module is starting to go out I get the service engine light coming on and off and I scanned the car with my brother at a bmw shop and it threw the fuel pump code countless times as well as module code. I was thinking about going aftermarket to run e85 but don’t know which is the best in terms of reliability. My brother works at a bmw shop so he can install the new fuel pump and new module as well as code in the new module all I would pay would be for parts. The only thing is the shop won’t install aftermarket fuel pump only stock so I’d have to do the aftermarket on my own which I could. My question is if I get an aftermarket pump can they still code in the new module or should I stick with the stock pump? I will be throwing a tune very soon as I’m getting down pipes as well so I was hoping to go aftermarket on the pump. As well as which pump is the best ?

[iqraceworks]

Have the shop install and code then we module. Then when you get the car back home, install a walbro 450 stage 2 pump and you will be good to do.

Running an E40 mix will make more power than straight e85 on stock turbos with the stock HPFP. The only time e85 will make more power is if you can flow the extra volume it requires....which means port injection.

[Danhui955]

I will be running a mix not straight e85. Will I need to run a tune in order to use the stage 2 fuel pump? I’m still waiting on downpipes to arrive, But appreciate you for your help

[335i54n]

no you dont need a tune for the pump, this is supposedly a better unit. as is I would do passive and active cooling to help prolong the life.

https://www.amazon.com/ET3-Design-In.../dp/B09Y3MT86H

[iqraceworks]

Originally Posted by Danhui955

I will be running a mix not straight e85. Will I need to run a tune in order to use the stage 2 fuel pump? I’m still waiting on downpipes to arrive, But appreciate you for your help

You will need a tune to run the ethanol mix, but you won't need anything special to run the larger LPFP.