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Message: <blockquote data-quote="Tazza" data-source="post: 36586" data-attributes="member: 82">It could cause an air leak, but they are tap off lines, they will not cause air to get into the inlet of the injector pump. The fuel just pours back into the fuel tank and is picked up by the pickup tube.As you said slopes make the throttle change, something soulds like it could be loose. Do you get any smoke at full throttle?I wonder if there is an issue with the spring for the govenor. If you remove the throttle linkage, then remove the plate that the arm come out of from the engine. You may also need to remove the stop lever plate too, i'm not sure. There should be two springs that connect from the throttle lever to the govenor arm inside the engine. Does any of that make sense? If there is a problem with the springs, it will not put enough tension on the govenor and it simply will not throttle up.</blockquote>