1978 911SC fuel pump check valve

[Jackson63]

I am replacing the fuel pump on my 78 911SC. The new Bosch fuel pump has a longer neck on the fuel delivery side of the pump. My question is should I be able to blow through the fuel pump check valve that was on my old pump? Or does it require a lot of pressure to overcome the valve? Next question because of the long neck on the new Bosch pump is there a check valve in the neck? Would two check valves be bad? I am thinking about pulling the guts from the original check valve so I can still hook up my fuel feed line. That is if the new Bosch pump has a check valve built in. The new pump is a Bosch 69513.

[Solamar]

Hope this will help - The chart lists the different pump specs. Look at "Outlet Connection", (F) indicates internal check valve

0 580 254 984 is for >7/79
0 580 254 053 is for 8/79>

Thought I had a conversion chart to Porsche pn's but cant find it...

Also worth noting that the earlier pump has a female connection, later male. Earlier fuel lines had smaller banjo connections (10mm I think) vs later are larger (12mm?).

So if you put a later pump on an earlier car (with early fuel lines) you will have to monkey with adapters.

[Jackson63]

I just talked to Bosch tech support. He said that the new pump has a check valve in it. Thinking about reaming out my old check valve so I can hook up my fuel line.