720 fuel leak

There is a fair amount of oil that is flipped around in the pump compartment by the cam and pump action. Look carefully to be sure it is not fuel. A fuel leak will generally wash the black sulfur deposits away helping to reveal itself. Make sure you examine the lines under the valve cover. Look for spraying there. Don't look for leaks with your finger ! The pressure is so great that it can inject the fuel directly into your skin, or at least tear it badly.

Sometimes if you have a loose injector line or a crack, it will cause a miss in your engine. If you can't find a leak, loosen one injector line until it misses, then tighten it up. See if it runs better than before. Do the same for the other side. You might detect that it begins to run smoother. That might have been your leak.

I had one where the line nut on the #2 injector had come loose and caused the oil to be fuel diluted. Snugged it up and the problem went away.

Frank-in-Tallahassee
70D // 855

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