Hello OM
Thanks for your reply and many thanks for always helping out with these issues.
I found this thread from 13 years ago where bob says the return line is for engines that have the fuel tank below the pump to provide constant bleeding which makes sense as the 944's tank is below the pump.
I wonder if you could just plug the return line. Do you think Cat would be able to help out with some info on this?
On another note do you think I should fit a primer pump to this engine? I started it a few years ago and it had no problem picking up fuel from a container on the ground and that would be more difficult than getting fuel from a gravity feed tank.
I don't see any issue with plugging the return line. If you wind up with priming or air locks you could always go back to a bleed line.
Same with the priming pump. Not all units have that feature. They are nice to have after opening the system but not necessary. They also can create problems due to lack of use.
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