Using 12 volt auto fuel pumps for pumping emergency fuel?

Seems those little 12 volt fuel pumps on Ebay/Amazon have a short life. They may only be made to work a few minutes before overheating.
I bought fuel pumps made to be used in a cars fuel system. They should be able to pump for hours at a time. But the connective wires are only ~ 12" long. So I wonder if the splices for longer wires need to be water (moisture) proofed. Would heat shrink tubing be sufficient? Perhaps only a good connection is needed?
Need to turn 12" pos and neg wires into 6 feet. Wondering what needs to be done to the connections. The connections will be surrounded by fuel while pumping.
I bought fuel pumps made to be used in a cars fuel system. They should be able to pump for hours at a time. But the connective wires are only ~ 12" long. So I wonder if the splices for longer wires need to be water (moisture) proofed. Would heat shrink tubing be sufficient? Perhaps only a good connection is needed?
Need to turn 12" pos and neg wires into 6 feet. Wondering what needs to be done to the connections. The connections will be surrounded by fuel while pumping.
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Country hardware stores have "Well pump splice kits" with heat shrink & glue sleeves to make waterproof splices, not sure how heatshrink holds up to gasoline.
There are hand crank drum pumps too, should last a long time.
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Seems a well pump splicing kit is the safe way to go. Though I'm still not sure it is needed for ~ 20 minute exposures.
https://www.princessauto.com/en/detail/12v-dura-lift-electric-fuel-pump/A-p8643173e
Also Transfer Pumps for bigger fills.
https://www.princessauto.com/en/detail/12v-fuel-transfer-pump/A-p2460029e