Originally Posted by Truckracer

In my experience, Blue Loctite is not affected by gasoline ..... But! That is the wrong formula for holding a throttle plate retaining screw. Red would be better as it is much stronger and the green wicking formula would be better yet. You have to be extremely careful with green though as if too much is used, it will follow along between the butterfly and the shaft and get between the shaft and housing and lock it solid! Don't ask me how I know! Use just a tiny bit of the green on the threads after assembly.

Regardless of the formula used, are you sure the threads in the shaft are in good condition to hold a screw? If the screw was ever removed without grinding the swaging off the back side, the shaft or more clearly the threads in the shaft could be ruined. If the threads and screw are in good condition, the Blue Loctite should be more than adequate though the other formulas are preferred.