What would cause both bowls to drain overnight.

Carb is a few months old.

Gaskets for metering block and float bowl have been replaced.

Fuel is not leaking around the outside of the carb so it must be going down the intake.

Oil is fueled up after about 500 miles so I keep changing it until this gets sorted.

Float level is normal as per sight glass.

When I shut the motor off I don't see any fuel running out of the squirters or venturi area in general.

Idle seems good - has 17 inches at about 800 rpm and generally runs OK.

Power valve is OK - and it's both bowls leaking anyway.

I emailed Grant about 10 days ago and got no answer.

Thanks

 

still leaking?

I would check for cracks now or leaking squirter gaskets

 

Give me a choice of ten carbs and I'll pick the bad one every time..lol