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Thanks F E - The original return tube ( which I incorrectly referred to as overflow/vent ) at the back of the tank has the chain oiler branch spigot pinched off and welded up on the outside of the tank . It is also pinched off and welded closed on the inside of the tank on the rear side of the filler neck. In seeing this I thought that this was done as an improvement by CnW but perhaps not. I have just blown air through it from the bottom and there is flow so is the exit hole for returning oil blind between pipe and tank wall ? This may be where I went wrong . I'm sure there is no harm done as I don't see what difference which hole the oil returns to the tank from but it will certainly be easier to monitor return flow from original location. Is the return tube on your tank pinched off and welded inside the neck ?

 Thanks for the help _ RT

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