Quote:
Originally Posted by Jayhovah
If you're already tuned on the 255 you may want to replace with another... most likely your idle pressure (unless you drilled the venturi and regulator) is higher than OEM... idle may suffer if you change back to OEM (this is only if you got a custom tune after putting in the 255).
If you did all the drilling, etc, then your idle pressure will be low if you go back to OEM.
I think the only case in which you would want to go back to OEM is if you never drilled anything for the 255 and never got a tune done after installing it.
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What will happen if you drilled the jet and then go back to a stock pump, the fuel pressure will not lower, but the venturi strength will be lowered. Because the drilling did not modify the regulator, it was just to allow the regulator to breath better for the higher volume of fuel it had to bypass with the larger pump.