[T3] Update with a Bowl Full of Rust Flakes

[Mike Fisher]

There is a  side-view picture Somewhere of the FI and Carburetor gas
tanks together.  It will make sense, when somebody posts up the
picture/link.

On Sun, Jul 24, 2011 at 11:30 AM, SCS Crewcab <scscrewcab at bellsouth.net> wrote:
> I just can't picture what you're talking about. I think I understand one end
> of the passageway running under the cup opens into the void of tank. Where
> does the other end open? Into the return tube, into the cup, where
> specifically? Also is there a diagram or a discussion on the function of the
> passageway in the literature?
>
> I'm new here so, maybe I just don't understand how the tank works in
> general. The tank I have has an opening at the very bottom (lowest point)
>  of the tank.  To this opening there is a nut with a fuel line that connects
> to the suction line of the pump. This is the opening that has the copper
> fuel sock filter. There is separate opening at the bottom of the cup that
> connects, via a tee, to the return side of pump. This connection does not
> have any filter at all.  Due to the law of gravity, all the gas in the tank
> (except the small amount remaining in the cup) would have to empty through
> that opening. Is this not correct? If the description is correct, what keeps
> 3/8 of the gas in the tank from flowing through that opening when the hidden
> passageway becomes clogged?
>
>
> On 7/24/2011 8:38 AM, Jim Adney wrote:
>>
>> On 23 Jul 2011 at 22:15, SCS Crewcab wrote:
>>
>>> Boy, this sounds ** really ** complicated!  When I look into that cup
>>> from the opening for the fuel sender, I see a direct opening to the
>>> return line going out of the tank. Looking from the bottom up through
>>> that return line, I don't see any openings in the the line other than
>>> the one that opens directly into the cup.  Do I have some kind of
>>> aftermarket tank?
>>
>> Sounds like the standard tank, you just can't see that detail from
>> above or below. If there were no other opening, it's pretty clear
>> that this would run "out of gas" once the tank dropped to something
>> below about half a tank.
>>
>> If you watch in the tank with the engine running and the tank quite
>> low, you can see that the cup will be full, and actually spilling
>> over, while the level outside the tank is well below that in the cup.
>> You can also see a high area above the return port, from the momentum
>> of the returning gas.
>>
>> There's no easy way that I know of to actually see the passages that
>> are involved, but you can see the effects of the system on the gas
>> level. It's interesting, for example, to watch what happens when you
>> start the engine, or just start the pump, with the tank level low.
>> You can watch the cup fill up and then overflow.
>>
>> Somewhere over the years I've seen a published sketch from VW that
>> shows this scheme, and Dave Hall has a sketch of his own on his web
>> site that shows how it works. Dave usually steps in and gives us the
>> link to that page whenever this topic comes up.
>>
> _______________________________________________
> VWType3.Org mailing list - type3 at vwtype3.org
> http://lists.vwtype3.org/listinfo.cgi/type3-vwtype3.org
> Contact gregm at vwtype3.org if you need help with the list.
>



-- 
http://s169.photobucket.com/albums/u236/mr_bojangles500/