Walbro 255 pressure
#1
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Walbro 255 pressure
I recently installed a walbro pump in my 2000 trans am. When i took it out for a drive it started running terrible. In the low rpms it would spit and sputter...wouldnt clear up until around 3k rpm. I let it idle in the driveway and the fumes were so strong they burned my eyes. Fuel pressure is holding steady at 64psi. I thought that was a little high considering stock is 58. My question is, has anyone else run into this issue? Does the walbro run a tad higher pressure than the factory pump?
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That is exactly what mine is doing. I actually searched and read though your thread lol. Didn't want to steal your thread. I'm thinking retuning it will help.
#6
TECH Regular
63 is normal. It shouldn't cause a rich condition at all much less sputtering. Maybe if the PCM had learned to adjust for a very lean condition of a bad fuel pump before the switch. But I don't think even a 10 psi increase in pressure would cause it to run that bad. And it would learn the new AFR in a few minutes and clear up.
#7
i am fixing to put a 255 in my car my question and it might be a stupid one but do u have to get ur car tuned if all u have done is a fuel pump as the only upgrade u have done to it ???