fuel pump problem.. won't prime for some reason, Dr 914/George could you verify markings on China pumps please Options

[tod914]

Put in a nos bosch 3 port pump in my car after changing all the fuel lines. There is gas in both the feed and return line from the firewall to the pump.. no kinked lines there. I checked and checked my fuel line configuration. All seems good..
fat line from fire wall to step hose to filter to S / top of the pump. D line to feed into engine bay. R has the 2 return lines and the bottom of the pump. Now the pump has the correct bosch numbers on it, but does not have the S D R on it. I would think it's the same as my old pump even though it's not marked like that. fuel routing in the engine bay is fine. been over that several times. the pump turns on fine when I turn the key 1/2 way. I tried that like 30 times to try to get pressure to build up. nadda.. even tried pulling feed line in the engine bay to see if that helped. Even ran it directly from the battery for like 10 seconds like the instructions said.
Any suggestions on how to get this pump to prime/push fuel?

[swl]

Should be easy check out. Just pull the R and route it to a collector. If that works then it probably is the check valve. Else switch S and D and see what happens.

Can't say if you would be able to recover from the stuck pop off. I had one like that and even after I disassembled it I couldn't get it to work again. The rubber tip had malformed and was causing just enough drag to stop the fuel pressure from opening the valve.