Thanks for the input gang. Now that I've got it all torn appart I'll do some test runs without the header. I found this idea somewhere, and it seemed to work great when I broke in the saito. The main tank was a full foot lower than the engine. I might have got the idea from a source using a much stronger and larger gas engine.

Is there anything else that can be done to help this setup work other than a smaller tank or a pump?

Anyone else run this mod on their senior? I heard it was a common thing to do.