fuel tank mystery?
Posted February 24, 2004 - 09:28 PM
Posted February 24, 2004 - 11:04 PM
i have a clarke 4.3 gal tank, and the left side is way lower
than the right side, and i would also like to know how does
the fuel actually get to other side where the petcock is ?
Posted February 25, 2004 - 02:23 AM
Posted February 25, 2004 - 03:43 AM
Seriously though, the petcock location could be lack of enginering on their part, but more likely it's a matter of gravity. If you look at the petcock in relation to the carb it is probably close to the same height as the float bowl or higher. If the petcock was lower then the fuel would have to travel uphill to the carb. So the petcock can really only go so low before it will not work properly (usually when the fuel level itself gets below the float bowl).
Also it's about numbers. If your'e shopping for a larger tank MFG's know you look at the total capacity, not useable capacity (I don't know of any MFG that gives that number). So after you get the biggest mofo out there and bring it home do you notice details like this. If it really bothers you, there is a way to keep the petcock drawing the fuel all the way from the bottom. Radio Control airplanes and helicopters use small plastic tanks that have a rubber stopper with brass tubes through it for fuel flow and venting. This acts like a petcock with no valve. Inside the tank a piece of silicone hose, long enough to reach the bottom of the tank, is safety wired to the draw tube and a hollow brass weight attached to the other side. The weight usually stays at the lowest point of the tank (normally where the fuel is also). This is the best way I know of to get the most out of a tank, but you still have to keep the gravity feed issue in mind. Unless you were to also pressurize the tank like a R/C airplane or add a fuel pump, the fuel flow would be questionable once it got below the float bowl level. Another thing to keep in mind if you try this is that the flexible silicon hose is designed to move around as the plane rolls pitches and flips (hey, maybe Pastrana could use this idea ) in order to follow where the fuel goes. This may cause stress on the petcock at the place where you would tie the hose and keep that weight banging around the inside of the tank.
Personaly, I'd just go until I run out then switch to reserve. If I can't find fuel by the time that runs out then I lay the bike on the petcock side and keep on (prayin for gas the whole way )
Ps: The wheelie trick really does work too
Posted February 25, 2004 - 04:33 AM
If your bike is sitting on the sidestand then the fuel would get trapped in the saddlebag. Under normal riding conditions my saddlebag is just as dry as the petcock side. If we are smart enough to see that one side of the tank is lower than the other, I hope the guys who designed the bike also picked up on that. Make sense?