Help with Fuel Pump question

[OrtegaGSX]

Well I have a 91 eclipse gsx, its pretty stock right now other than an aircan from hks and 550cc injectors. Everything was fine until i installed a Walbro 255lph Fuel pump, now at high rpms it seems to have like either a miss fire or like a lack of fuel. Then I installed a wire kit for the pump, seems a little better but I still have that little missfire at around 6200rpm. Can anyone give me any idea what to look for? Thanks Steven

 

[boosteclipse]

Do you have an adjustable fuel pressure regulator? The 255 will flow too much for the stock fpr, you may in fact be way rich at wot.

 

[turbodsm007]

the 255 flows a lot of gas, what happens is the fuel pump over runs your stock FPR

 

[OrtegaGSX]

No I haven't got a FPR yet, the fuel pump was a freebie from a friend. Thanks, I'll look into a FPR.