5LEEPERISAH23I

iTrader: (23)

i have a walbro 255 installed ran perfect. when to put in the walbro 400 seeded nicely, didnt hit any wires nothing.

went to start it up n it idles nices but the A/F was 10.0-11.3 i think it was that i need a FPR. So i went out and bought one. started the car n the FPR gadge goes from 0 PSI to about 5 PSI when running

so this made me think i had not correctly installed the walbro 400 right. unstilled it and put the walbro 255 in. Idles 10.0-11.3 n FPR reads 0-5 PSI im about to but a bullet threw my car!

only thing i could possibly think might be the problem is that the blue n black wire whiling pulling out the 255 they came off but i put them back in the clip and they seem to be fine

anyone have any idea what might be wrong! just makes no sense i modd the fuel pump housing n then put the 400 in then doesnt work so i put in the 255 again n now that doesn't work when it just did!

Here is a Video of what it is doing
http://www.youtube.com/watch?v=5UEs1...1&feature=plcp

wizzo 8

iTrader: (35)

How is the factory black seal at the top? Do you still have the white spacer?

Tuxevo

iTrader: (8)

Your fpr is not being overrun. You'll want to follow the instructions in this thread.
https://www.evolutionm.net/forums/ev...ould-know.html

Figured i'd add some to this. Did you try driving? If not give it a shot. Did the afr's fall back in line? If so then it is probably the siphon tube needing to be opened up a bit. The additional fuel flow may be backing up at that point. Why it didn't go back to normal when you put the 255 back, I couldn't say.

wizzo 8

iTrader: (35)

I don't think that's it. If its doing it with the 255 then its definitely not this.

Tuxevo

iTrader: (8)

I did a little ninja editing to explain my thinking.

To the OP, what modifications to the fuel pump housing were necessary to run the 400lph pump?

wizzo 8

iTrader: (35)

https://www.evolutionm.net/forums/ev...ification.html

Tuxevo

iTrader: (8)

Thanks, seems pretty straight forward.
If there were damage done to the pump wiring i could see the pump not working, but not over pumping.

Has the fpr been taken through it's range of opperation?

nightwalker

The OP should step away from the car for a couple hours, take a breather, clear his mind, and then retrace his steps. That's where is answer will be.

wizzo 8

iTrader: (35)

Yes this always works for me when I'm frustrated and in a bind.

5LEEPERISAH23I

iTrader: (23)

i did that. i retraced my steps. found nothing.. took the 400 out n put the 255 in. then took that out n double cheacked the 400 was in correctly. same problem. so now the car idles rich 10.0-11.3 n doesnt move on both fuel pumps and the fpr reads 5psi

wizzo 8

iTrader: (35)

What kind of fpr do you have?

5LEEPERISAH23I

iTrader: (23)

aeromotive

5LEEPERISAH23I

iTrader: (23)

put a video up of what it is doing. it also was doing this with the 255 fuel pump. the walbro 400 is in the car with this video

wizzo 8

iTrader: (35)

Are you sure that gauge is reading correctly? I dont even know if its possible for the car to run with that low of a fuel pressure. Maybe if I have time this weekend Ill turn my regulator down to 5psi to see if it runs.

5LEEPERISAH23I

iTrader: (23)

that a/f is reading right positive