Dear Darrell;
Yes a vent is required for the fuel
to dispense properly.
In aircraft; the fuel cells can't
collapse W/O one. A check valve is
closed when inverted/steep angles.
On the sealed (SMOG cars) the tank is
vented via the vacuum canister device.
BTW: they now have a special (SMOG)
test for that in California now. FUBAR
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The OP has multiple problems I'm thinking.
