Installed the brand new EHA and a salvaged Fuel Pressure Regulator. Applied fuel pressure to the system and got 6.3 bar of control pressure. I had no pressure difference, but with an unadjusted EHA, not unexpected.

When I shut the FP down, the pressure dropped to 4.0 bar and held. Starting to see some light at the end of the tunnel.

Got out there this morning and right back to 5.1 bar. Installed a brand new FPR and still only 5.1 bar. As long as the FP delivers enough fuel pressure, the system should hold at least 6.5 to 7.0 bar of pressure.

I don't have fittings to close off the fuel return to the tank. So I clamped the rubber hose with a pair of vise grips to cut off the flow. The pressure did not change one bit.

I'm to the point I suspect the new fuel pump. I'm going to test the flaw rate in the morning.