OMC single hose tank question

[frankr]

If the o-ring around the pin leaks, you can usually hear or see it while pumping the bulb. Usually.

[outbdnut2]

quote Adam1961:

It seems that the valves on my tank are working as they should, as I get pressure or vacuum in the tank when moved to a warm or cold space with the cap shut.

With the cap shut and the fuel line plugged into the tank, you should not get a vacuum – the one-way vent should prevent that, but if you are talking about getting a vacuum when the gas line is not connected to the tank – yes, that’s right.
Dave

[Author]

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