Originally Posted by stillen
Engine is a Ohnan, 20hp..... There is a small box looking thing on the side of the engine which the fuel hoses go to. There doesnt appear to be any electrical wires going to it....... just has a in and a out........ someone mentioned a pulse type fuel pump at work
A pulse type fuel pump uses 3 hoses. One from the tank to the pump. One from the pump to the carb. And one from the pump to the engine crankcase. It uses the vacuum/pressure pulse to to run the pump. Now on Onan engines you may not see the third hose from the pump to the crankcase because it is hidden behind the pump going though the engine cover. Makes removing and installing the engine cover REAL fun.