Fuel level controller/new never used/bought years ago original box deteriorated/this looks to be an extra supplier(holds extra fuel till needed) of fuel. Has float and clearly marked inlet/outlet with threaded in brass fittings(supplied by me). If u have a weak fuel pump or one that doesn’t perform as it should(maybe pump pressure is too high)this fuel level controller may be the answer. Appears to me is a remote reservoir that gets its supply from the pump and then as the level goes down, the float level drops and fuel is resupplied from the pump which in turn “feeds”to the carb.No PayPal, postal m.o. is best.$30 part/$15 ship to CONUS/not shipping outside of U.S. !! John from Texas but now living in Lewes,Delaware 19958/ 979-595-7324 cell.