Loose connection in the radio's antenna.
If the pump isn't running, no electricity is flowing; therefore no RFI.
The vibration from the priming into loaded-with-water could have broken an already weak connection.
I'll complain bitterly about that POS 'Entertainment System' too! But you've got antenna wiring issues to be fixed.
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TT 2015 19RD "TheJayco"
TV 2003 F-350 "Montblanc" - Housebroken chore truck
Sitting in The Cheap Seats.
And proud of it!
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