Nissan NS5B gas cap

ajcampbell31

Cadet
Joined
Aug 30, 2016
Messages
25
Question - 2003 Nissan 5hp NS5B - does the gas cap on the tank keep a vacuum? It seems that when I take the cap off, he engine seems to start to sputter and eventually dies. My tank cap threads are virtually non existant so I have to keep a bungee cord on the cap. But when I had to add fuel, I had to take the cap off, the engine bogged down in neutral and then quit. It did this both times. The first time i chalked up to coincidence, but twice seems to erase that thoery.









 

Sea Rider

Supreme Mariner
Joined
Sep 20, 2008
Messages
12,345
If upper cap vent screw is open letting air in, working without cap or with screwed threads while in operation, should have 0 bogging down issues.. That's a 13 year oldie, clean all fuel related parts, remove tank, internal fuel mesh filter, large filter and carb as well. Install a new plug tip gapped to 1.0 mm tight, use fresh fuel...

Happy Boating
 
Top