
Originally Posted by
3 on the Tree
The on and off switch for the gas cap is a vent used to relieve tank pressure. I usually leave mine on (open) unless I'm doing some serious hill climbing, then I turn it off to prevent spillage.
This may sound silly, but some of my trikes "run out of fuel" even with half a tank. The pick up tube for the fuel goes a good 2 to 3 inches up into the tank. If you put the pet cock on "reserve" it will draw fuel past where the pick up tube does; all the way down to the bottom of the tank. Give that a try.
I'd also suggest running an in-line fuel filter as others have stated, along with removing the bottom of the pet cock for a thorough cleaning. Rust in the tank wreaks havoc on the carburetor’s jets.
Does your choke cable move all the way to the left? Does it feel like you have to keep pressure on it to keep it from returning to the right (choke off) position? I'd suggest a healthy dose of WD-40 in the cable channel to keep it lubricated and see if it will stay choked for you after that.