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Paul,
I was wondering, since your header tank isn't vented, is this scenario possible? If you run the engine on the ground long enough to get everything under the cowl, including the fuel lines, hot enough for the returning fuel to boil (low pressure, high temps), wouldn't the boiling fuel cause the volume of fuel & vapor in the header tank loop to try to expand, causing pressure to build up in the header tank? Assuming it this does happen, due to expansion, the extra fuel/vapor has to go somewhere. It seems to me that it could possibly expand enough to force the rest of the fuel that's in the header tank back into the main tanks, eventually emptying the header tank... then the engine quits. Just a guess.
Mark S.
One final thought.....my aluminum sump tank in not vented. Seems we discussed this at length when I was building this thing, and since the overflow is pumped into the sump tank, the fuel might just be pumped right out of the vent. Take care. Paul Conner
Paul, the returning fuel is less than the fuel taken out. Without the vent, how do you make up the difference?
Buly
Hi, Buly....the balance of the fuel just comes from the main tank. As fuel is used from the sump tank, more fuel is gravity fed into the sump tank, which is located lower than the main tanks. Paul Conner
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