i have a friend call me yesterday about this . The W9 tractor he has is a gas tractor . The question i have is has anyone out there ever seen 2 holes in the bottom of the fuel tank ? One hole has an elbow coming out of it with a line going to the carburetor , no sediment bowl but someone added an inline filter. The other hole is beside the main outlet their is an elbow coming out of this hole , but it has a hose clamped on it and a plug in the end of it . What is this for /? Has anyone else seen this before ? My guess is something that has been added by someone or could this be from a diesel tractor? . I told him i would find out what i could . He is 94 years old and still works on Case and Farmall tractors., and not computer oriented . i have been around these tractors for 45 years, and i don't remember seeing this . I hope this not a stupid question. Thank you for your time . jjw.