EZ-8 or EZ-8RV model pump? Just went through this issue on my 2008 Rage'n. Make sure on the model by checking the serial number tag on the pump.
Parts for EZ-8 are easy to find and reasonably priced at multiple places.
EZ-8RV parts are available from one retail source. Price seems high in comparison. That source is Affordable RV located in Hesperia, California.
http://www.affordablervhd.com If you are a qualified reseller, parts maybe available thru ECI Fuel Systems. ECI is the sole distributor of the Great Plains Industries EZ-8RV model pump.
http://www.ecifuelsystems.comBTW, this is the first pump problem since buying the trailer new. The gear problem showed up after a long period of the trailer sitting with a full tank of treated non ethanol fuel. Got the pump to work fine with a little gear sanding. Not sure how long the repair will last so ordered a kit from Affordable RV.