Carburetor Bulb Not Working

[AdamE]

Hi all. I've got an old Toro GT2S with a Briggs 5hp. I'm not sure which engine right now, but this is a pretty general question.

A year or so ago I noticed the bulb wouldn't move any fuel making starting a lot more difficult. I replaced the bulb but it didn't fix the problem. I'm thinking there must be air getting in somewhere.

Is there something common that I should take a look at? A new gasket set maybe?

Thanks.

 

[Scrubcadet10]

Is this on a tank mounted carburetor? Or a Quantum engine with the primer on the front of the Airbox and seperate carb and tank?

 

[Rivets]

Or the model and serial numbers off the mower.