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I will do this in a bit. Not ignoring suggestions. On my way to get pressure tank and fuel.
Can't tell you how much I appreciate all the input on the forum. I ordered check valve from Newell anyway. Looks very difficult to remove as it's back in there. Getting crow (feet) ends.
So a working system will have no bubbles , . Not sure I understand what happens to the air in the fuel bowl as fuel rises/ falls.