AT27622 New Fuel Return Tee Fits John Deere 2030 2040 2120 2130 2240One New Aftermarket Replacement Fuel Return Tee Fits John Deere Tractors This aftermarket replacement fuel return tee (AT27622) sits on top of the pencil style diesel fuel injector and connects to the fuel return line, directing excess fuel back through the return circuit. It is a key component in the fuel system of a wide range of Fits John Deere (Fits JD) diesel tractors equipped with 3. 9L and 5. 9L engines including the 4239D, 4239T, 6329D, and