Kubota T1670 15hp Kohler

[man00]

Engine is GH430V, after it sits for couple of weeks I have to remove the air filter and prime the engine to start.
During the summer months it starts fine, when being used weekly. Would adding a primer bulb after the fuel filter fix this?

[bgsengine]

No sounds like your carburetor is leaking fuel away and if tank is below level of carburetor (probably) you have to crank it a long time for fuel pump to replenish fuel in carburetor. (or a combination of a bad fuel pump leaking fuel back down and carburetor leaking or evaporating fuel away)

[StarTech]

Being an early 2000's engine, I would pull the fuel bowl which I suspect is aluminum and check for pin holes causing a slow un-noticeable fuel leak. Note parts for this engine only available through Kubota.

If your just needing a new bowl; post if it is a Walbro or a Nikki carburetor and I might be able to come up with Kohler part number for a bowl replacement kit.