'92 Coachman Chugs & Stalls Cold Gas to Fix - Another Way?

To test for a dying fuel pump, the next time it shuts off and wont start spray some gas or starter fluid in the carb if it starts and keeps running while you are pumping gas in but engine dies when you stop its your fuel pump. To test for a failing coil check spark when engine is cold then check spark when engine is hot and shuts down. Will the spark jump .250 to ground? My guess is a failing fuel pump.