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The HH sits on top of the IP and has the steel fuel injector lines on it. The rest if the IP is the internals for advance and Gov. plus fuel pump to bring the fuel pressure up to 70lb when at higher rpm.

No problem little buddy. Guess we should not use HH but Hydrolic Head or the distrubuter for the fuel. When air gets into the system one way or another the Head don't like it. Now we just try and find out why fuel is leaking back to the tank and leaving the line with air or we have something...

You could also try and leave the intank pump running for a min. then try and start. Running the intank a while will not hurt it but clears the HH.

As Trolll said for the most part. Do believe if you look at the overflow for the HH it goes to a T fitting on the secondary filter and the return line to the tank. It could be possible for some air to enter back to the finial or bleed screw. If one though that there was a lot of air you can...