Vent Line From Tank to Where

[Fourward]

I have two lines from the gas tank. One, of course, is the fuel line, it has a tee in it that can be used to drain the tank. It runs up to where the fuel pump would be. (Engine is not in the car) The other line runs alongside the fuel line, comes out in the engine compartment, then has a longer hose on it that goes past the fuel pump, and ends in a tee. Does anyone know what this attaches to? Shop manual has a diagram at the tank, vent line (3) attaches near the filler neck.  Doesn't show where it goes however.

[Dwight FitzSimons]

An Avanti has two "fuel" lines from the engine to the tank.  One, the larger one, supplies fuel to the engine.  The other one is a return line from the engine back to the tank.  It returns fuel back to the tank in case of an over-pressure condition.

1963 & 1964 Avantis attach the return line to different places on the engine (63 at fuel pump, 64 at filter between fuel pump and carb).

The vent on top of the tank goes over to the passenger side of the vehicle, then down through the fiberglass and exits under the car.  This one is a problem to replace.

--Dwight

[Fourward]

Ahh, thank you, Dwight. Even though this is a 63, it has the look of being attached at the filter between pump and carb. 

[Dwight FitzSimons]

This pic is of the 1964 fuel delivery & return lines.