Thread: fuel psi gauge question

just want to make sure that when install my fuel psi gauge u am going on the return line. I have checked some pics or ppl set up and some ppl have it from the pump(before first fuel psi regulator) and some have it after the fuel psi mointor (other second fuel psi regulator). It should read 3bar or 44 psi.

Also when installing a Nismo fuel regulator, the nuts are hard to come off what have you done to remove that with out breakin


Thanks for the help

i would assume it would be after the regulator since that is what regulates the pressure. If it was on the feed line then the pressure would vary based on whatever the pump is putting out for whatever voltage is running to it.

The gauge needs to be between the fuel tank and the fuel pressure regulator. Here is the basic layout:

Tank -> Gauge-> Injector Gallery -> Pressure Regulator -> Return Line to Tank.

The fuel pump is in the gas tank. The FPR is on the far end of the injector gallery (driver's side - the similar thing on the other end of the gallery is a pulse damper or some such) because it controls the flow of fuel to change the pressure at the injectors. The gauge needs to be in the line before the FPR or the pressure reading will not reflect what the injectors are seeing, which is what you care about.

ya but on a ve there is Tanks-fuel psi reg-injectors- something that looks like fpr-return...so where does gauge go

On a VE, the "something that looks like fpr" is on the passenger side and the real FPR is on the drivers side of the injector gallery. The gauge should still go between the fuel tank and the passenger side of the injector gallery where the fuel enters the gallery. The FPR on the drivers side of the gallery controls the pressure and releases fuel to be returned to the tank.

It's easy to get confused on the VE because of the way the lines run. The supply line runs from the fuel filter toward the FPR, but it actually goes under the FPR and snakes along behind the valve cover to the damper and then supplies the injector gallery.

tank-> filter-> lines behind valve cover -> damper-> injector gallery -> FPR -> return to tank.

The best place to put the gauge is between the fuel filter and the metal injector gallery line that runs under the FPR behind the valve cover from the driver's side to feed the injector gallery through the pulse damper on the passenger side. Just find the fuel filter and follow the exit hose to the metal pipe under the FPR. Splice into this rubber hose to install your fuel pressure gauge. Remember to pull the fuel pump fuse and run the car until it stalls to remove pressure before cutting or removing any fuel lines.

thanks man, cheers i will be installing this gauge and fuel pump sunday. cheers


rob

this tread needs pics!