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It’s Good to Vent

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I have a 41-footer with twin gasoline stern drives. Lately Iíve noticed decreased engine power and surging at higher speeds on one engine. Everything seems to check out, but the problem reoccurs. Any suggestions? T.B., via e-mail
Assuming you have twin fuel tanks and that only one engine is drawing from one tank, look at the fuel tank vent serving the misbehaving engine. Proper venting is required for fuel to flow from the tank to the engine, and if there is even a small obstruction in the vent, the fuel pump may not be able to pull enough fuel from the tank to supply the engine, especially at higher speeds. The result can be decreased power or surging and, if the restriction is considerable, stalling at lower speeds or even failure to start.   more...

 



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