just tap the power to your pump from your taillight or something, or switched 12V.
The only problem is it won't stop then in a crash, but you'll be able to drive.
We have two AT's with a switch so we can put the pumps on direct 12v to fill up our MSR stove.... and we've forgotten to switch it back pretty often ;-) So no problems there.
Be careful with car pumps, most of them have a higher pressure which will mess up your floater valves. Had that in Chile with my AT, no fun!
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