Carb leak question

[merc_man]

Got a carb off a weedeater that i put on the mifhty vac and thought it wasnt leaking till i put in water. not a fast leak but a bubble every 5 seconds or so comes out of the hole in carb .

Its the little hole in the round part of carb. Sorry for not know proper name lol.
Would this leak matter. Reason for new kit was lines were rotten so thought i would put kit on qhile i was at it.

 

[Chainsaw Jim]

Put a new kit in it and run it.

 

[merc_man]

That was with a new kit. But i was playing with it. Pushing the primer balb and it stopped. Any idea what it would be. Meter lever? I never used ro test carbs for air leaks till i got the mighyy vac. Wonder how many other carbs had small leaks like this.

 

[merc_man]

I just put it togeather and it seems to run a heck of a lot better then befor.

Stihl curious what that little leak was though.

 

[Chainsaw Jim]

I'm not so sure it was a leak at all. They're not supposed to hold pressure indefinitely.

 

[merc_man]

I'm not so sure it was a leak at all. They're not supposed to hold pressure indefinitely.

Oh ok. Never new that.thanks

 

[merc_man]

So if ya presure check them is it just to check gaskets?

 

[Chainsaw Jim]

I can't remember off the top of my head. But there's a certain psi it needs to hold for a specific time. It's about five or seven seconds..something like that.
Usually I take a foot long section of fuel line and pressure check the nozzle from behind. I hold it tight with one hand and blow back and forth through it to check the activation of the valve and if it holds my tongue to the other end of the line then I know the check valve is sealing tight.
Older hs tillotson carbs for the older husky saws don't even have a check valve. It's just a screen that slows backward flow down to the point of it being a non issue.

 

[Simondo]

15 psi is a good pressure before metering needle blow off or significant leak .

 

[TJ the Chainsaw Mechanic]

For me if it holds pressure for 5 seconds I call it good and throw it on. If something is wrong you'll know it.

 

[Poleman]

Some new off the shelf carbs won't hold pressure until fuel/mix is introduced to lube the needle and moisten the gaskets so they expand and seal.
That carb should be fine.

Other good info here too!!!