#7113, "RE: Strange fuel trim values.." In response to In response to 7 Nov-03-06 07:04 PM by eclpsmoneypit95
Originally posted by hookduphatch the thing with the stock fpr is that when you start flowing more fuel to it, the little return hole can't keep up, so your psi rises as a consequence.
That's why he installed an afpr...it's an issue with larger than stock fuel pumps: they can overrun the stock fpr. Simply switching to an afpr shouldnt cause problems by itself. As a matter of fact, it should perform like stock. Your fuel pressure should drop when you hook up a vac line. Your base pressure is 37 and with a vac line hooked up, it goes up to 38-39. My guess is your fpr is bad. It should drop 1 psi for every 2 inches of vacuum.
