There are some quick-and-dirty ways to ensure that the petcocks don't overfill and drain into the carnkcase. I see you have a standard 79F. You can first test for leaks by getting some lengths of hose,
(1) disconnect the fuel line from the petcock while the petcock is set to "ON." This is the position that should only flow when vacuum is applied to the other nipple.
(2) check for leakage out of the petcock nipple.
(3) Do the other petcock the same way.
(4) If there is some leakage, you can leave the leaking side's carb fuel line disconnected and cut a small length of tubing, find a bolt that will plug the end of the length of tubing, and plug off the offending petcock with the hose/bolt plug.
This will buy you time until you sort things out. At least it will prevent contamination of the oil.
(1) disconnect the fuel line from the petcock while the petcock is set to "ON." This is the position that should only flow when vacuum is applied to the other nipple.
(2) check for leakage out of the petcock nipple.
(3) Do the other petcock the same way.
(4) If there is some leakage, you can leave the leaking side's carb fuel line disconnected and cut a small length of tubing, find a bolt that will plug the end of the length of tubing, and plug off the offending petcock with the hose/bolt plug.
This will buy you time until you sort things out. At least it will prevent contamination of the oil.
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