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Do the pumps you have match the original number that Chainbreaker called out (with inline EMI filter), or were they changed to something else before you got it?

You aren't going to find exact fuel line material off the shelf, as you find on the 00x sets. You will need to make something up with equivalent sized modern hose and civilian fittings (they are AN-5, so you will need to source or have made a line with JIC 5/16 fittings).

If you think the aux pump is good, uninstall it and reinstall as your new primary and test it. See if the condition disappears.

Have you inspected the return line and fittings?

The fact that you describe a slow roll to OFF tells me its a fuel flow issue. If it was an abrupt stop, its probably not fuel. All old fuel lines can swell sometimes too, so you may not see the problem until under use. Those Onans are pretty rugged engines... how does it sound when its running...

It sounds to me like a fuel delivery problem. The fuel pump that still works is probably overheating/failing under use, which is why you are seeing the PSI drop. I would get a new pump for this machine (especially since it sounds like you already are missing pumps...). How do the fuel lines look?