Fuel pump relay and pressure.

[carfanatic89]

I hooked a fuel pressure guage to my supra. I found that when you turn the key to the spot right before you crank it. I get no pressure to the fuel rail. Only when im trying to start it does it have pressure, It picks up the signal voltage from the RPM guage I think. So im thinking bad FPR. Am I right, is that what the FPR controls,the inital pressure before to actually try to crack the vehicle. Also no matter if my vacuum lines are hooked or not to the fuel pressure regulator, the fuel pressure stays the same 20 psi down to 15 psi at full throttle way under the 32 to 40 its suppost to be at, but when I turn the car off the rail retains that 20 psi for about 2 hours so I know the fuel pressure regulator isn't stuck. What do yall think it is. Im driving her 300 miles back home i'd like to fix it before I leave. Im putting on a fuel filter 2morrow and testing pressure.