Ace 100 petcock leak

[megawat]

Took pet cocks apart, checked, cleaned and reinstalled with new gaskets, still leak, any suggestions appreciated.
Don

[RichardMott]

Some have posted that using low abrasive valve lapping compound was a good way to get them to stop leaking. New ones from SH are not that expensive.

[Zyx]

Are they leaking into the fuel line, or out the face of the valve, or between tank and petcock?

[MTRob]

On one of my tanks I ordered new petcocks from Paul and cleaned the hole and installed them one was leaking so I tightened it tighter to no help still leaked. I finally put JB weld all around it and it hasn't leaked at all. Don't know how long it will last put so far so good.
MTRob

[Dale]

To avoid seepage from the threads, apply a little soft set thread sealant made for fuels. I have a tube called Gasoila. It really works.
Dale

[MTRob]

I did that to. Put a sealant on the treads, it still leaked. It was leaking from around the nut welded to the tank. Either get it re welded or use JB weld.
I have 3 more tanks I got cleaned up put don't know if they will leak until gas in the tank.
MTRob

[RHall1972]

I had the same issue with a tank a couple of years ago. Applied JB Weld around the circular perimeter and the repair is still holding fine.