Re: GENSET ONAN CUMMINS cannot restart after fuel filter and oil change

amelliahona <no_reply@...>


I just replaced my electric priming pump on my SM #335 Onan Genset.  I did not have access at the time to a proper FLARE NUT WRENCH when I did this.  I ended up distorting the "B-nut" on the small copper fuel line that goes from the fuel pump to the fuel filter adapter and could NOT get a proper seal upon replacing this line (a continuous small seep of fuel that was really annoying and messy).   I had to order a replacement line (not that expensive) and buy a proper set of flare nut wrenches to adequately get a seal.   I wish I could remember the size of the flare nut but it was SAE (not metric) sized.    Make sure the fuel tank is low on fuel (think 250 liter will work) otherwise a continuous stream of fuel will flow by syphon from the fuel tank fuel return line while you make this plumbing change.  I managed to turn this otherwise simple replacement into a major project based on A) not using the proper tools to loosen and re-install the B-nut of the fuel line, B) not have lowered the fuel in the tank (mine was full at the time of my work).  

Good luck.  The pump was about $65 as I recall (not that expensive in the scheme of things) and the fuel line was about $8


Gary S. Silver
s/v Liahona
Amel SM #335    Puerto Rico 

Join to automatically receive all group messages.