I have a werid question, maybe a dumb one.<br />Heres the scenerio. I have a Yamha 40 el 1993.<br />I have 2- 6 gallon tanks and a 5 gallon caddy.<br /><br />Yesterday was the first time I had taken this boat out more then 2 miles from moorage so I filled up all the tanks so we would not run out while we were fishing. <br /> One of the tanks has a smaller diameter hose 1/4 I think, and the cap has a vent. I open the vent and prime the bulb and start as usual. I noticed that when we use this tank we get great milege, we went over 10 nautical miles plus trolling and came back to the moorage with about a quarter tank still left.<br />Now the sencond tank I have had, I purchased it at a shop in town and it was cheap. It did not have a vent on the tank or on the cap. The fuel line I have for this one also has a larger diameter; 1/2 I think. Any way I open the cap just enough so that it can vent and prime and start but the difference is that I only get about 1/2 the milege out of this tank then I do with the one that came with the boat, which has a vent and a smaller diameter hose. <br /><br /> Now the motor runs the same, regardless of wich tank I use. <br /><br />What would make that other tank go through gas much faster, is it because of the larger hose diameter or the fact there is no vent so I leave the cap just a little open( no gas is being spilled from doing this either.). Since it is not affecting the way the motor runs I am going to buy a vent cap and gotot a smaller diameter hose for this tank and see if that makes a difference.<br /><br />Any one else have this issue or know what the cause whould be?<br /><br />Any way I will experiment with the new hose and vent cap next week and see if it makes a difference.
