Plug fouling.

[habsdoc]

What is the exact problem with the petcock that causes the dreaded #2 cylinder plug fouling??? Can it be fixed??? The petcock is not leaking and you can hear the clicking when vacuum is applied. Carbs have been dipped and ultrasonically cleaned, bench synced, valves adjusted properly, plug wires cleaned with new caps. Coil wires swapped from one side to the other and the #2 plug fouling problem stays with #2 plug. Waiting for my Morgan Carb Tune. Is the only solution a new petcock??? Thanks for all suggestions in advance.

[Agemax]

when you say the petcock is not leaking, have you pulled off the fuel pipe that goes to the carbs and see if it is dribbling even with the engine not running?
if the pet cock will flow fuel (or dribble) with the engine off and the tap in the ON or REServe position then the petcock is faulty.
it should flow freely with the tap in the PRIme position.

[tom203]

Also, the vacuum line itself can dribble fuel down and into #2 cylinder and foul the plug. Get some clear vinyl tubing sized to fit petcock vac fitting , push it on, and suck- any fuel headed your way? If yes, just get a new petcock - you likely can get one for about $60, so skip trying to repair a leaky petcock.

[habsdoc]

Yes, I have checked the fuel to see if it is leaking. I let it flow into a container over night and there was no evidence of any leak. I will try sucking on the vacuum line a little more to see if it does flow any fuel, but I didn't get any fuel while just listening for the click in the petcock. Yes the "on and reserve" work and the prime flows freely too. Thanks.