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drz400 fuel system

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I have a friend I ride with that just bought a new DRZ400. He put a larger tank on and has some issues. It won't run unless the fuel stop is on PRI setting. On my dirt bikes I have on, off, and reserve. The drz has on, pri, and reserve. Is there anything he did with the new tank. The fuel line to the carb from the tank has a big bend in it or could it be the cannister, Ca model? Any help would be appreciated. Mike KLX300/TTR125.

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On the S model, vacuum pressure is required for fuel to flow in the ON and RES postion.

There is a vacuum hose which attaches to the stock petcock.

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Thanks. I called and told him about this post. I don't know but with the clark 3.9 he migh thave too much bend in the line. He didn't know about the vacumn petcock on the S.

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