Hello guys. I have a fuel pressure problem in my evo. In wot the afr its fine then in Full boost afr put lean in 13s and car made like ignition problem. I attache a video I think its a bad fuel pump.
I use a 450lph walbro

 

What RPM/boost is it going lean? I'm not signed into YouTube so I cannot view the video.

 

The car its tuned with 30psi street and l 35 with VP.
I turn donw the boost to 25psi and put lean and made like ignition problem in high rmp

 

can you post some logs?

 

Yeah, without logs we have no idea what is happening. But there should be no reason that the fuel pump wouldn't supply enough for high boost on race gas.

 

Is the fuel pump rewired? The OEM wiring is not sufficient for the Walbro 450...


But yes, post logs.

 

For race fuel it should handle it no problem. If he were running e85, no stinkin' way would it be enough. Now that I am home the video is showing as private and cannot view it. The 1100cc injectors might not flow nearly enough and be causing the issue.

 

Sorry for the video. Now os avalible.
I dont have logs. But with 25psi the car put lean and gave like misfire problem. May be tomorrow I can made a log.

 

I think its not rewired I remember When install the pump only install a relay.
Today i bought a new fuel pump in stmtuned with the complete kit package. You can see the vídeo the pressure problem

 

hello guys. Today I recive my new fuel pump from STM.
i installed and look the fuel pressure is too high. I come back to my old fuel pressure regulator.

I made a pull with 25 psi and 48psi fuel pressure and afr was very rich in 10.0

Then I boost to 29psi and down the fuel pressure to 38psi and always is very rich.

i think when i tuned my car the pump was in the last days ¡, now when I installed the new one the pressure is higher.

I attached a logg and if you can see it and tell me what do you think. the car always made like a cut in huigher rpms and afr is 10.0 in full boost.