Restoring the 280Z EFI Fuel pump (if possible)

A while back I cleaned my 280Z fuel pump and replaced the o-rings. Its running ok and I compared it to an old reserve pump. The reserve pump delivered about 75% of the flow compared to the one in the car.

Since these pumps are getting harder to find in good condition I decided to take a closer look at the spare pump. The outside looked shocking, corroded and rusty so I cleaned and painted it to make it look respectable.

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After opening it up Im wondering it was worth the trouble cleaning and keep it as an emergency unit. The inside is showing a lot more signs of wear compared to the one in the car.

There are possabilities to improve it. I was thinking of making a new center section (intermediate part) and maybe new rollers. The inner ring of this part has vertical lines which reduce performance some and make it noisy in operation. These parts are made from hardened steel, maybe steel type S890 (890MPa tear strength) would be suitable. Not sure what it would cost to make.

The inlet end plate could be surfaced 0,1mm to remove most of the wear. That would increase the crush on the o-ring, but it should be ok.

That should improve the output and reduce the noise a little.

Opinions welcome.

Here are some photos of the worn parts and a drawing of the part for possible replacement.