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Fuel Pump Problem

azza86

By azza86,
in Engines & Forced Induction

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azza86 Rookie

azza86

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Hey, i have an R33 Gtst and i just replaced the fuel pump with a Walbro Gss342 and since doing so have had trouble getting anymore than 40 psi at the regulator, its a brand new regulator and i tried two gauges with same results. It seems that the pump is struggling to make pressure does this sound like a faulty pump or something else, any advice would be much appreciated.

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azza86 Rookie

azza86

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Okay I re-wired the fuel pump this afternoon checked the voltage was 13.8v got good fuel pressure while the engine was cold and screwed the reg back to 44 psi, after going for a short drive and warming the engine up i can't get any more than 40 psi again with the vac hose disconnected even if i screw the regulator right in.

azza86 Rookie

azza86

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It's definitely fixed now decided to put a direct earth wire to the battery, straight after doing this i noticed the difference and the fact that it pumped up to 100psi so i screwed it right back to 44psi no vac hose and everything seems normal now but makes me wonder might have a crappy earth connection somewhere where does the earth connect to on the body i see the battery is connected to the body buy where does everything else get its earth.

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