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I still don't know if you are talking about the hard clutch fluid line or the fitting that screws into the cast clutch body. A new line should be easy and any good auto parts or brake shop should be able to help you get what you need.
If you broke the fitting that's something else and you can get a used one or maybe find a replacement fitting in a good selection of brass natural gas/plumbing fittings.
Regarding your 740, I'd say you should post your question in the 700/900 forums... Read the Brickboard 700/900/90 FAQ!!!
I do own a 940 and have had two different 700s. The 1990 turbo is a bosch system and is pretty simple. The 8-vale 1990 is a Rex/Regina system ans those are a little "weird." If your pump relay is good, try the radio suppression relay (if it has one). A failing RSR will cut ground-side power to the pump. You can swap it with the fan relay for testing. I do not know if the bosch cars have them...
But if you get pressure while cranking... I'm not sure. I've had Fuel Pressure Relay Problems, plugged Flame Traps and failing RSRs, but never quite what your describing.
I know from my D-jet 120 that power is supplied to a pump during cranking via a separate circuit that while running, but that's a circa 1971 setup...
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