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The evaporator cartridge usually contains a charcoal filter, and usually there is some sort of valve arrangement so that while the car is running the vapor line is connected to the intake manifold, and to complicate it further, sometimes there's a valve that is controlled by the brain box so that purged fuel vapors are not introduced into the intake manifold until the engine is sufficiently warm after a cold start.

Regards, Bob



"M. Adam Davis" <adampic@UBASICS.COM> wrote ..
> On a fuel injected vehicle there are typically three fuel lines that
> attach to the tank, ignoring, for a moment, the refuelling inlet.
>
> 1. Tank to engine - goes to a filter and then a pump
> 2. Engine to Tank - comes from a bleed off valve in the engine.  This
> valve maintains the same fuel pressure so the injectors can be timed
> rather than measuring the fuel actually squirting in. (constant
> pressure, constant opening size and shape, variable time open)
> 3. Tank to evaporator or some such device.  This line goes to a
> cartridge or box of some sort which allows air to move in and out of the
> fuel tank.  The purpose of the box or cartridge is to contain fuel
> vapors if the pressure happens to be pushing air out of the tank.
> Mainly for EPA regulations, and to meet many state requirements.  Box
> usually does not need to be replaced for the life of the car, but can
> sometimes get clogged.
>
> You can find out which line is which from one of the service manuals.
>
> -Adam
>
> Richard Graziano wrote:
>
> >Anyone know about the 3 connections to an auto gas tank.  I was helping
> a friend replace a fuel tank in a 198 Olds Cutlas. I connected the proper
> line from the fuel pump. There was another line that I connected the same
> way it was.  I don't know what it is for. there is another line that I
> could not figure out.  But the car runs and the fuel gage does not work.
> Any help would be welcome.
> >
> >Thanks
> >Richard
> >
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