Fuel Pressure Same W/ Vac Line On & Off

[ARMAGEDON]

Hello All,

I just bought a new fuel pressure gauge. I installed it right on the FPR at the gauge port w/ a 90* fitting.

The strange thing is it reads 30 lbs. when the vac line is removed from the FPR or plugged into the FPR. No change in pressure reading.

When I adjust the set screw two to three full turns clockwise the lbs. will adjust a pound or two, that's it.

After turning the car off, the pressure gauge drops to 25 lbs. then after 20 to 30 minutes it goes to zero.

Any ideas?

Thanks.

 

[90stang5speed]

fuel pressure should be between 38-40 PSI. I just had an issue over the weekend with my fuel pump building pressure. The car started, ran like crap & finally died & would not restart. fuel pressure with just key on (Pump no factory wired) was only 20 PSI. the pump was running but didn't sound right. I found that my main ground & fuel pump ground were loose. The regulator could be bad or the filter could be clogged or the pump could be clogged or failing too.