[Shige671]

I just changed my lowpressure fuel pump to stage 1 reading at 74psi stable. I also change my high pressure fuel pump reading lowest 700 psi. It revives good at netrual but wen put on drive it bogs & die out. No trouble code. Need help. What can it be?

[iqraceworks]

Originally Posted by Shige671

I just changed my lowpressure fuel pump to stage 1 reading at 74psi stable. I also change my high pressure fuel pump reading lowest 700 psi. It revives good at netrual but wen put on drive it bogs & die out. No trouble code. Need help. What can it be?

No codes at all? What are you scanning it with? These cars will pretty much throw a code every time something "odd" happens.

If I had to guess, I'd say it's got to be something with your LPFP or HPFP since you were just messing with them. Can you run a log and watch the fuel pressures and see what happens to them with the car dies?

[Shige671]

I use mhd. My vehicle is 2007 bmw 335i n54 sedan. My mod are mhd , xhp flasher tool. Cone airintake, stage 2 turbo. Throttle booster, I just change low pressure with stage 1 fuel it pump series to exist pump & high pressure changed also. Lpfp reading at idle 60-74 psi. Hpfp from 600 - 700psi. When I put on drive car dies out on low rpm but on park engine revs good . When. I start it after it dies out psi is over 1200 -2000. Then drop to like 700psi. What psi should range should lpfp & hpfp be??