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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