In a message dated 1/10/2002 5:12:14 PM Eastern Standard Time, capnrich@cnw.com writes: << Trawler-world-list@samurai.com >> Just looked through the diesel fuel system section in the ABYC Standards and Recommended Practices book and saw nothing about mandatory fuel supply tubes from the top of the tanks. The standard says if you have a gravity supply it must have a shut off valve. The standard says sight tubes are OK also as long as they have shut off valves. Top mounted supply tubes can dump full too if they are not equiped with a shutoff valve or anti siphon device. The anti siphon device is required on gasoline systems. Rodger Wrona Rollsdoc MT49PH