Engine not starting?

My vechicle seems to be using to much gas, I changed the plugs to pulstar cb1. Before that it seemed flooded, wouldn't start for days till I OPENED the choke all the way, want to know best ay to resolve this. Thanks guys

After sitting for a few weeks cngine does not start. Starts up at first and then dies immediately. After sitting for a while it will do the same thing. Starts up but dies right away. Happened about a month ago and I keep starting it and gradually it would run for a little longer each time. Finallly started up and stayed running - after that it ran fine for two to three weeks. Now it has sat thru the Christmas vacation and when I tried to start it it started for a few seconds and then stopped. Trying to start it right after that it just cranks and does not start. I let it sit for an hour and a half and it did the same thing.

Had similar problem with a ford and dodge van- both times was a fuel pump. Fuel is probably draining from motor back to tank, so each time you are basically starting with the gas in carb. Only and having to pull fuel up to motor each time from the tank. Check your screws on carb. (Don't overtighten) and lines for leaks.