Fuel check valve repair and replacement can be simple and inexpensive
It is a relatively simple machining operation to replace the valve seats with inserts as shown in this photo of an "Alamo" Blue Line cylinder head.
This photo shows the constrction of a check valve that is inexpensive, serviceable and made to fit any application. The check valve on the right is constructed from a carburetor needle valve and seat soldered to a piece of copper tubing. The shoulders of the fitting are ground off to make it smaller in diameter.
The valve on the right is rusted beyond repair and the valve face is ground to show there is no salvage to this valve. On the left is a modified, serviceable replacement that was a discarded truck valve. Note the larger stem end to hold the valve spring and retainer.