Suzuki Club UK

One problem i have with my engine at the mo is when its not running the fuel is running back down the pipes into the tank, so when i come to start it it takes a few runs to get fuel sucked up. Is this a problem anyone else is having/has had? Im thinking of fitting a 1 way stop valve to stop this happening maybe?

Is your fuel tank breather blocked creating a vacuum?

that would explain so many of my issues!! ill have a look when im home, cant hurt blowing it through, not into the tank of course.