This might work for a simple pump EMI shield. Get a large coffee can and cut openigs for the hoses and power lead and put a gound wire to the case or something tied into earth ground. If it doesn't work, at least you didn't spend any $$$ on it. If it works you can make a permanent metal enclosure.
Also you might want to get some Romex shielding from Home Depot or Lowes. It's the metal flexible conduit used in homes. Run your pump AC cord in the Romex and it will reduce EMI from the cord. Gound it to the same point as the coffee can.
Finally try the proven fix everything tool. Duct Tape! I saw a roll in your pic.
Hope one of these works and thanks for the work you are doing.
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