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Good point, but "with all lines intact", there will be flow, just check the return flow to the tank.

Right, and subtract a few psi from the drops across the filters along the way. If the piston doesn't leak in the "rest" position doesn't mean that it won't when in operating position. I would recommend that an oil analysis is done every so often to find out what might be mixed in with the...

I would argue that the pressure from the in-tank pump is insufficient to properly test the FDC, it operates on about 20 psi IIRC. The sealing surfaces are honed (?) to fit and hard particles (=rust) from the fuel tank especially will mar the surface. The piston in the FDC moves very little when...