Apparent Fuel Overpressure

[neon]

Hello Board - Will not start for more than a few sec after stumbling and barely bringing me home a few wks ago. I tested my pressure just downstream of the regulator after noting a hissing sound coming from the regulator. To my surprise, pressure was about 6 bar, way too high. I am assuming bad regulator, have not tried to adjust. Any thoughts ? Ignition tested Ok based on spark to plugs. Thanks
Dana in CT

 

[sfdon]

6 bars is max output pressure of your fuel pump.
The default of a failed FPR is high pressure.

 

[sfdon]

Be smart here- did you recently jack
your car up in the air? Test both sides of fuel system.

 

[neon]

6 bars is max output pressure of your fuel pump.
The default of a failed FPR is high pressure.

Thanks ! I have not jacked up the car recently but I disconnected the battery - is the only recent work. I will test the upstream side of the FPR also. If the fuel injectors are seeing 6 bar or thereabouts, would that result in a no start or rough running - rich mixture ? Thanks much Dana in CT

 

[Cornishman]

Thanks ! I have not jacked up the car recently but I disconnected the battery - is the only recent work. I will test the upstream side of the FPR also. If the fuel injectors are seeing 6 bar or thereabouts, would that result in a no start or rough running - rich mixture ? Thanks much Dana in CT

I think it will result in a fuel leak and possible fire.
I too would look at the return pipe and pressure regulator.

 

[coupedegrace]

Thanks ! I have not jacked up the car recently but I disconnected the battery - is the only recent work. I will test the upstream side of the FPR also. If the fuel injectors are seeing 6 bar or thereabouts, would that result in a no start or rough running - rich mixture ? Thanks much Dana in CT

6 bar is basically three times the specified fuel pressure - yikes! D-Jet is super sensitive to fuel pressure (from what I've learned). I agree with Cornishman, that sounds like a scary situation, especially considering the potential age of the fuel lines, gaskets, etc.

 

[mbmw]

if yo check the pressure after the regulator in the return line you should have almost no pressure. If you see any pressure ( or see the high pressure reading) you have a obstruction in the return line . Otherwise change the regulator.