makomark
Silver Medal Contributor
Check the needle & seat seal - use the Cliff Method - hand held vac pump plumbed into that 3/8" inverted flare fitting in the front of the carb.
Air expanding - possible - but from where??? have to be on the suction side or it'd be easy to smell the leak. If large enough, it won't deliver any fuel to the carb. Could use a piece of clear hose with the fuel pressure gauge hookup. Just get something that will tolerate the fuel.
Kind of curious about what changes when "up on the hill (& on the hose)" when it runs ok to when it floods - tilted?
DD - I've never seen anything other than the spring loaded outlet valve that sets the output pressure level. My old materials book indicates springs usually fatigue (k constant is reduced over time and cycling)....only way I could see the pressure increasing would be to corrosion, over time, lifting up the spring cup and compressing it.
Air expanding - possible - but from where??? have to be on the suction side or it'd be easy to smell the leak. If large enough, it won't deliver any fuel to the carb. Could use a piece of clear hose with the fuel pressure gauge hookup. Just get something that will tolerate the fuel.
Kind of curious about what changes when "up on the hill (& on the hose)" when it runs ok to when it floods - tilted?
DD - I've never seen anything other than the spring loaded outlet valve that sets the output pressure level. My old materials book indicates springs usually fatigue (k constant is reduced over time and cycling)....only way I could see the pressure increasing would be to corrosion, over time, lifting up the spring cup and compressing it.