Fuel Pump Install Then Running Issues

[clkngezz]

Hey guys,

had walbro 255 gss342 installed today to replace stock pump

all went in ok.

only thing is it seems to slightly hesitate just after a gear change when I go to accelerate.

seems ok on full boost, but can slightly hesitate when I go to accelerate.

now when I say hesitate, its not jerking back and fourth, its just not responsing to the amount of acceleration im giving, then all of a sudden it will go back to normal

not sure if a swap in pumps could cause this.

its running stock boost, fuel filter hasn't been changed

no tune has been done, and car was running very lean before pump went in.

NEED HELp ASAP

[chiksluvit]

Check fuel filter? Could be clogged causing fuel system to run low on fuel pressure

A replacement is only like $15 anyway

Edited November 8, 2014 by chiksluvit

[Dose Pipe Sutututu]

Did you ground it off to bypass the FPCM?

[scotty nm35]

Probably low voltage, either run a separate power feed through a fuse and relay, and earth the - neg side, or simply bypass the FPCM like Johnny mentioned.

Have a search, there is plenty of info on the subject.

[Deza3000]

Probably low voltage, either run a separate power feed through a fuse and relay, and earth the - neg side, or simply bypass the FPCM like Johnny mentioned.

Have a search, there is plenty of info on the subject.

Exactly this! Also was told a similar problem with the walbro fuel pumps, needed a fuse and relay, since draws too much voltage. Costs like 100 bucks to get it done professionally, or like 20 bucks if you do it yourself.

[hairdryer33]

I noticed the same thing today when I cranked a massive 10psi into it lol im pretty sure my pump has been changed as the wires and heat shink appear to be tampered with.