MFI electric fuel pump no pressure

[Theunz]

Ok, my engine is back in my 69S, but I’m not getting enough fuel pressure to the injection pump. I’m getting less than 1lb of pressure out of the fuel pump.
A little background. The car sat for 30 years and the fuel pump was completely froze up. I took the head off and flooded the armature with WD40 and got everything loosened up. Seems to be spinning freely when 12V applied. I put new O rings in and it is not leaking. Fuel flows freely from tank to pump and from pump inlet (bottom nipple) and out supply nipple (middle). I thought perhaps I clocked it wrong when I reassembled it, but I have tested it in all four positions with no improvement.
This is very frustrating, as this is all that is keeping the car from driving in 30 years, and my first time to ever drive it!
Any ideas before I give up and buy a new pump, which at $800+ is not an enduring prospect!
Thanks for any advice or solutions.

[majordad]

There are better and cheaper pumps out there than the Porsche one

[Theunz]

I have read about the pump offered by Zims, but there seems to be some concern about the lack of a return component. Certainly seems like a viable option however. Any other replacements?

[Arne]

The Zims MFI fuel pump is on my '72 T right now. I bought and installed it when tracking down a fuel delivery problem. It works fine, the return circuit from the MFI fuel console is sufficient. I repaired my original pump, but am in no hurry to put it back.

I'm sure the Zims pump is probably a readily available unit, if we only knew the application.

[friendlyfred]

I recommend a rebuild by Pacific Fuel Injector. They do quality work at reasonable prices, quick turnover.
I am very happy with their services.
-Fred

[edmayo]

The check valve in the pump is probably stuck open. Under that crimped on cap is a valve with a rubber needle seat. You might remove the end piece again and see if the valve is stuck. Also, have you inspected and cleaned the fuel filter sock on the feed side of the fuel tank. If the pump doesn't work I'd suggest a rebuild by "Fuel Injection Corp" so as to not have to modify lines, pump mounting and electrical connections.