LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Why do our cars have three fuel lines?

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Old 07-23-2003, 11:40 PM
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Why do our cars have three fuel lines?

One is fuel feed and one is return, what's the third?
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Old 07-23-2003, 11:57 PM
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It goes to the EVAP canister in the back driver side of the car
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Old 07-24-2003, 12:17 AM
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Exactly
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Old 07-24-2003, 12:36 AM
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what's the EVAP canister for? Is'nt there a vaccum line from the intake or something that goes there as well?
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Old 07-24-2003, 08:35 AM
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Originally posted by Blue96z28
what's the EVAP canister for? Is'nt there a vaccum line from the intake or something that goes there as well?
Yes, that is what the vacuum line is for. It pulls vapors from the gas tank to be burned in the engine.
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Old 07-24-2003, 02:54 PM
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Follow the "3rd line" and you will see it drops out of the bundle along the front/middle of the drivers side of intake manifold, connects to a u-shaped metal tube that turns toward the front of the engine, wraps around under the throttle body, changes to rubber, and goes up the passenger side of the intake to the EEC purge solenoid, mounted on the bracket that sticks out of the passenger side of the manifold. From there a vacuum line goes to the passenger side of the throttle body.
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