Quote:
Originally Posted by Frs300
this is what fullblown told me. "I have seen the oring on the pump not fully seat and the car would still run but would lean our very bad when it starts to build pressure"
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This is the problem I ran into when Visconti was tuning my car. I went from having perfect AFRs to leaning out at WOT. His solution was to install two O-rings instead of one and he had the part number to buy them from NAPA. I pulled my pump, installed the two O-rings and put it back together and my AFRs went back to perfect.