Join Date: Sep 2006
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If the Stewart Warner pump gets to (say) 5 psi, the pump switches off. Typically, with your hand on the pump, it should run intermittently... say a wee burst every 5 seconds, or so, dependent on fuel demand.
I suspect that the pump has perforated the diaphragm, though that is unusual so early in the life of it. If the diaphragm perforates, the pump will run and run, though mine did not overheat when it failed. It lasted 15 years, at least, pumping diesel.
Be wary of pump overheating when pumping gasoline. It sounds a bit risky to me.