Hi Gang: To make this tool related I've taken this trip three times. On the second trip our tour bus had run dry on diesel fuel and had to be re primed on the road. Half way to the tunnel pass the driver noticed fuel on the road behind us. We pulled over and tore up the floor cover to find the engine covered with fuel. I had the driver start the engine so I could see the leak. It looked like a M6 hole so I started looking for a screw I could steal to plug it. Just below the hole I spotted a needle valve screw where it had fallen out. I screwed it in and tighten it with a wrench ( the tool we weren't suppose to have ) and we made it to the Milford Wanderer in time for our cruse. Carl.