Quote:
Originally Posted by Biker Biggles
That hole to the left of the filler is to drain water that collects in the filler recess. It goes into a pipe that sits inside the tank and comes out under the rear of the tank. A rubber tube then goes from that and drains to the ground behind the engine. Sadly the pipe can rust out in the tank leaving a hole where water drains into the fuel. If this happens it is a major job to fix or a new tank.
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Yes, to test for this, is get a straw and blow down the drain tube, with the tank cap open. If you've got a full tank of fuel, you'll get air bubbles when you blow down the straw