Gas lines  By  scoot315 (Read 1,095 times)

If it is leaking out of the BOTTOM HOSE which is your bowl drain then the shutoff screw is not tight and allowing some gas to drain.
Alleyoop

Sounds like you have a leak between the float needle and seat.
My experience has always been it's either a speck of dirt or something between 'em or one or both worn out.
You're correct on the lines, one is the vaccum line to open the petcock ( it's on the bottom of the petcock centered over the diaphram), the other one is the gas line. ( it's on the side of the petcock by the side of the diaphram.)
I always do the following before putting a carb back on after having it apart:
With it upright blow though the fuel line air should go in, this verifies the float needle is open with float down, then turn the carb upside down and blow through the fuel line again, the float needle should block the air this time, this verifies the float needle will block flow when it's up.

the hose on the bottom of the float bowl is either the float bowl overflow line, or the float bowl drain line.
While sorting out what to do for my carb, I found there are Keihin, OKO, counterfeit Keihin, counterfeit OKO, and Unmarked Chinese carbs. ( all CVK type carbs )
some have float bowl overflow tubes ( gas runs out it if the float needle leaks with the float up ),
some have float bowl drain tubes with the drainplug screw in the end of the hose, some have no drain tube, only a float bowl drainscrew in the float bowl.
some have no overflow tube and no float bowl drain screw.
I haven't seen one yet with with a overflow tube and a float bown drain screw in the body that drains the float bowl out the overflow tube when it's unscrewed part way, but that's a possibility.
EPA carbs generally don't have a always an overflow/vent tube that's always open to the atmosphere, they typically vent the float bowl into the carb before the venturi to reduce raw gas vapor getting dumped into the atmosphere.
( venting the carb float bowl to a charcol canister was sometimes done on cars before fuel injection got rid of that nightmare of vaccum hoses it took to get carbed car engines to meet EPA requirements.)

Here are two types one is connected directed to your gas tank and the other is a stand alone petcock. I labeled the connectors so you know what goes to what.
Alleyoop

This type is directly connected to the tanks outlet:



This type is a stand alone connected by a hose from the gas tank.



Here is the LEFT SIDE of the carb similar to yours.

Thanks. Got the lines straightened out and it was running great. For some reason it would idle high, and then low, got it to a good idle and took it for a spin. Trying to dial in the air/fuel screw, fuel screw was set at about 1 3/4 turns and I turned it out about another 1/2 (counter clockwise - richened). Now when I start it I have to be on the throttle or as soon as I let off it dies. Any ideas on this? I know where the idle screw is and tried screwing it in, but didn't see to have much effect.