Hello, Sucking air

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My two tank system is somehow sucking air. When i floor it going up a hill, It will die sometimes. It happens on both sides of the switching valve. So it must be after the valve. I tightened every hose clamp on a fuel line i could. I replaced the primer pump with a new one of the new type. It did not help, it started leaking while pumping the first use, and it will not suck through the filter hardly at all and is virtually worthless. I was wondering if this could be the lift pump going out on me ? My next move is to put a bottle of fuel under hood for a tank and see what happens. If i still have the problem, what could it be ?

cheers,

biopete

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