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After-market tank sucks air when there is a gallon of fuel left

whitegreg56

Regular Contributor
So, I purchased an after-market EPA-compliant 6-gallon tank.
Since it vents "in" but "out", when it gets really hot outside
the tank swells up (a lot!). As a result, the pick up tube
comes off the bottom to the point where it sucks air when
there is still a gallon (or more) of fuel in the tank. Obviously,
this is not a good situation. Anybody got a solution?

Even if you open the cap, it takes a long time for the swelling
to go back down.
 
Another benefit of enabling the EPA to oversee the marine environment.....

about the only thing I know you can do is to extend the pickup tube inside the tank.....and don't expect the MFG to help much....any change they 'endorse' will obligate them to expensive retesting to validate their products compliance.....
 
Yep. The only thing I can think of would be to cut the pickup tube in half
and add a flexible fuel hose (with an arc) to the end of the shortened pickup tube...
with a hose clamp.
 
Serious question: When those tanks swell up like that, are they putting extra pressure on the diaphragm in the fuel pump? I always disconnect mine when not in use.
 
the diaphragm usually tolerates the pressure ok...its the poor needle and seat that typically suffers.

The fix in those cases is a (fuel) Demand Valve...
 
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