My Kawasaki fuel cap has a vent hole, and uses a dished breather seal on the inside. If the hole gets blocked it will not allow air in to the tank to replace the displaced fuel. Basically, the breather hole is there to stop the pressure becoming too high which can cause the engine to run richer. If the pressure is too low ( eg: damaged seal ) this can lead to fuel starvation problems
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Good video..very well explained. Hadn't realised how important the tank could be on these engines..thanks.
Very interesting.
I didn't know the strimmer tank was under pressure,
I came here for tips on testing a motorcycle tank.
That's a good bit of kit I think I need one. Will help me with 2 strokes. Thanks Colin.
The tank has to vent to atmosphere!
thought that was to let the tank breath?
My Kawasaki fuel cap has a vent hole, and uses a dished breather seal on the inside. If the hole gets blocked it will not allow air in to the tank to replace the displaced fuel. Basically, the breather hole is there to stop the pressure becoming too high which can cause the engine to run richer. If the pressure is too low ( eg: damaged seal ) this can lead to fuel starvation problems