Ian, You mean to say that the FPR "wears out" due to the high pressure caused by the 255 pump? This might explain why, on my A/F meter, I see it maxing out even at quarter throttle opening during accelleration. Or is this normal? Michael 94MTX,green,BOS+,Koni/Intrax,Baer,Corbeau SHO items for sale: http://hometown.aol.com/cmichaelo/for_sale.html