That's why I don't think the FSM tests are going to help me.

In any case, I just used the mity vac to pressurize the outlet fitting while plugging the inlet. It held steady at 30 psi. Put in under water, no bubbles, shaft or otherwise. So the lift pump is not the problem.

I'll attempt to pressurize the tank with the injectors lines disconnected and see if they product a steady drip. If so, bonus = new way to prime the system without wearing out your starter and battery (603's have no hand pump)!

If the lines drip fuel, I think I'll just put new oil in and run it, checking the oil frequently to see if the level starts going up due to fuel in the crankcase, in which case, it must be either the IP or the injectors.

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1986 300 SDL, gray on black, #14 head, 180K miles
1982 300 CD, silver on palomino, 290K+ miles [sold]
1980 300 SD, white on palomino, 500K+ miles when retired [uncle's car - inspiration for the above]