I have seen people apply the exhaust from a shop vac hose to the filler to pressurize. I'm sure the pressure would be low in that case but I can't say I have tried it myself except on my lawn tractor which drains back to the tank every winter. It works quickly to get the gas back up to the fuel pump and carb. I have even seen people doing that by blowing into a filler with their mouth, but I can't inflate even a balloon without getting a red face, so I am not going to try that method.
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