VST Output Pressure is good now. 2003 HPDI 250

[Bigtasty]

Engines still are not running correctly. Ran the Diagnostic found that fuel rail pressure is dropping down from 1000 to 500s or less after running for a minute or two. I'm getting plenty of flow through the mid fuel canister when the hose is disconnected. I've heard some rumor of another screen at or inside the fuel compressor. Anyone know more on that? What Next?

 

[rodbolt]

Re: VST Output Pressure is good now. 2003 HPDI 250

test lift pump pressure at the failing RPM, test VST pressure at the failing RPM, test High pressure at the failing RPM. then fix it.
all tests can be run simultaneously.
yes there are filters in the high pressure pump.
if AFTER testing the low and medidum pressure is good AND the inline medium pressure filter has been CHANGED, then remove the high pressure pump and contact Flagship marine in punta gorda FL.

 

[Bigtasty]

Re: VST Output Pressure is good now. 2003 HPDI 250

Lift pump 6 psi. VST 50 psi. High pressure 1000+ at start up and then dropping down into the 500 range after a minute or two. Mid canister filters have been changed and provide full flow.

Nothing I can do with the High Pressure pump? Does it have to be remanufactured at Flagship? Any idea on the cost ?

 

[rodbolt]

Re: VST Output Pressure is good now. 2003 HPDI 250

then I would suspect the filters in the high pressure pump.google Flagship marine in punta gorda FL.