"Rebuilding" stock 280Z Fuel Pump

[Roberts280Z]

Has anybody done this?

 

My 280Z will initially start and run fine for a few minutes.  The fuel pressure will rise when you goose the gas as it should.  But after a few minutes, the pressure drops under load.  I suspect the pump, which is indeed a little noisy.

 

Many years ago, the pump would get 'stuck' if the car sat too long, and I would take apart the pump to free the stuck bits.  And I acquired 2 additional pumps along the way - one new and one rebuilt.  The rebuild was from MSA for $99 with a $40 core charge, and I think I just kept the core.  I see that a rebuilt is now $389 with a $600 core charge, while new pumps are $1150.

 

So now I have 3 pumps, and I would hope I could make a working one out of these.  The only mention of rebuilding that I could find anywhere was on an old Canadian forum, where they cautioned about using the proper O-ring (https://atlanticz.ca/zclub/techtips/fuelpump/index.html).

 

Thanks in advance!