Walbro 255 going crazy

[john 89]

Alright so, my 89' coupe with a red top SR is having some weird fuel pressure problems. It currently has a Walbro 255 pump and a Nismo adjustable regulator. It seems to do fine for about the first 30 mins of driving, around 38-40psi at idle and 45-54 psi driving, but then the pressure will start to flucuate anywhere from 55-68 psi at idle or driving. Usually i can faintly hear the pump buzzing but tongiht when the pressure started going nuts the pump was making a really loud and clear unusually hight pitched noise. it had a stock regulator on it but i broke and the car started running 60+ psi all the time so i got the Nismo one. It seemed to do fine for a few days but now its doing this. It is like the fuel pump has too much power going to it sometimes or something.

thanks for any help

[john 89]

help?

[Ender_Zero]

weird, the only thing i could suggest are take the walboro out and check the connections, then if they are fine, call walboro and tell them you got a faulty unit.