[T3] Update with a Bowl Full of Rust Flakes

SCS Crewcab scscrewcab at bellsouth.net
Sun Jul 24 11:57:16 PDT 2011


That would be great. Does it show the hidden passageway?


On 7/24/2011 2:37 PM, Mike Fisher wrote:
> 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.
>>>
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>>
>
>



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