The Ford 3000,3100,3300,3610 etc. series tractors have been around since the early 60's. Built to last these solid workhorses have proven to be long lasting dependable tractors. We see more and more of the injector pumps coming in with a worn out head and rotor or the cam ring down which makes for a expensive repair. Why repair it when you can buy a brand new Fuel Injecton Pump andgood to go for another 40-50 years!! As a added bonus since these pumps are new we don't need a core you can keep your old pump .