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It isn't supposed to stay on, with out cranking the engine. It's in case of a wreck and the engine stalls, you don't want the pump to pump gas out until the battery goes dead, or the whole scene explodes into a giant inferno.
Now in order to burn up a pump, taking you for your word that this is happening, it would have to draw too many Amps. And with out blowing a fuse (not easy). This pretty much rules out any type of short in B+ between pump and fuse. Now this leaves the ground circuit. If the ground circuit is corroded/breaking down, then this could result in a very hot ciruit inside the pump motor. The "easiest" way to check it would be to voltage drop from the grounding point to B-. You should get no more than .2V. If it is higher, like .6. or worse yet something 1V+, then your ground wire is bad and requires repair/replacement.
Not knowing you exact year, I would voltage drop Ground Point 3 on the left support frame, then go from there.
Skoot
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