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I don't get it? Why are there so many vent tubes and hoses on the gas tank, and then goes to another tank to vent? Most cars don't have a vent tube at all, they vent from the filler neck. Others may have one small vent at the top of the tank. Why such an elaborate system? Does anyone know the Datsun logic here?
Mike
 

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Actually, I think most new cars have a vapor tank

> I don't get it? Why are there so many vent
> tubes and hoses on the gas tank, and then
> goes to another tank to vent? Most cars
> don't have a vent tube at all, they vent
> from the filler neck. Others may have one
> small vent at the top of the tank. Why such
> an elaborate system? Does anyone know the
> Datsun logic here?
> Mike

It is interesting, but I believe most new cars have a vapor recovery tank like Z cars. New car gas tanks don't vent, at least not to the outside. Part of the On Board Diagnostick II system (OBD-II) of new car emissions monitoring equipment keeps tabs on the integrity of the fuel tank vacuum. If there is a leak in the fuel system (tank, etc) of greater than 1 millimeter, the check engine light will come on. So I don't think the Z system is unusual.

Alex
 
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