Primer bulb

[Geochurchi]

Hi All, primer bulb not priming, new tubing, has been working fine until it stopped and there is no fuel in the bulb after pumping many times.
Geo??

 

[bertsmobile1]

IF it pops up quick it is leaking air
If it returns very slow one of the filters is blocked

 

[Scrubcadet10]

Engine model and type numbers