[steve84]

Good morning Tony and thanks again for the advice. I used the CIS test rig with the two 12Mx1.5 female connectors that came with my test kit, with the isolation valve closed on the line not connected to the test port. With the engine not running and DME sockets 30 and 87b jumped, I measured 38 psi and 2.6 bar. So the fuel pump works and fuel pressure is within spec for that mode.

I then switched off my jumper and the pressure dropped as follow: 34 psi/2.4 bar (5 minutes); 33 psi/2.3 bar (10 minutes); 32 psi/2.2 bar (multiple readings over next two hours); and 30.0 psi/2.1 bar (@3 hours after toggling off jumper). I haven’t seen any spec’s on retaining pressure in Bentley’s Manual. Do these readings indicate that FPR is good?

Later in the evening, I attempted to do the test again and see if reading are the same. Before turning the jumper back on, I depressed the pressure relief button on the gauge and there was a puff, but no release of fuel in the release tube, and the gauge zeroed out. I then turned on the jumper and heard the fuel pump working but 0.0 pressure shown on gauge. I then opened the isolation valve on the CIS test rig and fuel freely flowed out of the non-connected end, showing that the fuel pump was working and fuel was getting to the pressure test port on the rail. Right now, my hypothesis is that the cheap gauge from Amazon crapped out. Any suggestions? Thanks in advance.