Not sure what the issue is with a magnet, never seen a fuel nozzle that wasn't aluminum so not magnetic.
My GMC truck the DEF fill was under the hood next to the firewall, very unhandy, & regardless whether pumping or pouring it had to be very slowly or it would burp back, which a magnet wouldn't have helped.
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Fulltimed 10+ years
Sold '13 Thor Redwood 36 FB
Traded '13 GMC Denali DRW D/A
Replacement undetermined
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