89stanger1989

i get 130 street miles to the tank and have no air leaks. i got vacuum gauge it reads 20 at idle. i want to play with the fuel regulator and see if it helps. how do you adjust it.

brentloftis

Not to be a *** but do you have a adjustable FPR?

calinotch

lol no can doozo ifyour stock buddy. get an aftermarket one and itll be pretty obvious how to mess with it.

PRO50SC

If your mileage is that low, there's an underlying issue that an afpr is not going to correct.

89stanger1989

lol yes i do. but if thats not the problem what can it be?

brentloftis

Do you know the model type of the FPR, most I have seen use a adjustment screw on top secured or locked by a jam nut on bottom, loosen the jam nut and adjust the screw clockwise or counter to raise or lower pressure.

Edit: tell us more about your car, from your screen name I assume its a 89GT? Any other mods or changes prior to the poor mileage. The gas has to be going somewhere, what does your exhaust smell like?

89stanger1989

its a lx with a 5.0 . i bought it borded out to 306 with crane cam rocker arms. not sure on the crank or cam but it doesnt idle to hard like a cam. headers, pullies,373, 8mm wire with the 2 prong spark plugs, and intake. the exhaust smells like gas but doesnt smoke much. i am only 18 and the gas is killing me

brentloftis

My friend, gas is killing us all..... I am almost considering driving my girlfriends ninja 250. For your problem it sounds like it could be a number of things but start at the cheapest and easiest. Clean Maf & IAC, listenfor vacuum leaks, check that the O2's are reading correctly/// I am sure there are more but I tired and going to bed.

cleanfitty

some have an adjustment screw where the vacuum plug goes. You do need a guage to set it right.