You can get the OEM Onan one from PPl motorhomes for $82. I bought the Airex from Amazon. Mine failed after 40 days, in the same way as yours is currently failed, overheats after a few hours and then if it cools it works again. Tried to use the warranty, well their is no warranty, because the warranty has to be honored by the seller and Amazon won't take it back after 30 days.
They also have the fuel filter.
https://www.pplmotorhomes.com/parts/rv-appliances/generator/permanent-generators/permanent-generator-replacement-parts/cummins-onan-fuel-pump-a047n929_49-7991?gclid=EAIaIQobChMI2YqipvH14wIVmpOzCh3YuwywEAQYBCABEgIoKPD_BwE
https://www.pplmotorhomes.com/parts/rv-appliances/generator/permanent-generators/permanent-generator-replacement-parts/onan-fuel-filter-149-2341-01_68657
2017 Thor Hurricane 34J
Gone-2014 Chevy Express 3500
Gone-2016 Jayco White Hawk 32DSBH
Gone-2013 Keystone Bullet 294BHS
Gone-2007 National SurfSide 34DE
Gone-2006 ForestRiver Sunseeker 2900LTD
Gone-1994 Fleetwood PaceArrow
Gone-1978 Kit RoadRanger