2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 159Get this manual
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500 EFI FUEL SYSTEM 7 Place the Fuel Pump Service Tool (PU-50326) over the fuel pump PFA nutUsing 12" drive ratchet or breaker bar, loosen and remove the PFA nutDiscard the PFA nut and use new PFA nut