I have 1983 Universal M18 that started with an air leak in the fuel line last season. Very puzzling because I checked everywhere and couldn't find the origin. Now it is leaking fuel out of the Timing Port. I'm guessing it is coming from the Injector Pump since that's the only part of my fuel line within the Bell Housing. All other pumps, lines and filters are external. Engine still fires and runs for a while, but the issue is getting worse.

Has anyone experieinced this before? What am I dealing with? Big deal or not?

Any insight or advice is greatly appreciated!!!