I didn't use it for 4 weeks.

It won't start.

I drained the gas and put fresh in it.

Still won't start.

Can I put started fuild or something in the tank to help it start?

Carb cleaner?

Need more info... nothing added to the gas will help anything...
Where was it stored? Etc?

I didn't use it for 4 weeks.

It won't start.

I drained the gas and put fresh in it.

Still won't start.

Can I put started fuild or something in the tank to help it start?

Carb cleaner?
Never put carb cleaner in tank.