Fuel Gauge on FPR Drops 5lbs when Vac Off

[ebx]

[Hotrod1122]

Weird proble with the fpr maybe it's faulty

If u r trying to get it to run richer u going to have to
Crank the pressure cause the computer will adjust for about 10-15percent so adjusting that much higher will prolly mess up ur drivability since ECM Will be pegged on the adjustment side ur best bet is to tune in some more fuel adjusting the Maf transfer

[novi306]

what you set the fpr at with the vac line off and plugged is where it will stay,unless under boost with the vacuum line hooked up.. if the vac line is on it will reference less fuel pressure at idle under full vacuum, when the engine is under load it will produce less vacuum and the fuel pressure should go up...