Frustration . . . that’s the word which describes the M1942 and M1950 NRV (Non-Return-Valve), a.k.a. check valve (The Department of the Army Technical manual, TM10-708 calls it the air check valve). The problem is that the original rubber gaskets get old, dry out, and then fail to seal, allowing fuel to enter the pump tube. Some people say that this is one of the two primary causes for stove fires on these two stoves. The other is the pump-tube-to-tank gasket (TM10-708 calls it the filler cap gasket).
The check valve Continue reading