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Re: [T3] FI Fuel Tank restoration - revisited

On Sun, 2006-04-16 at 18:07, big.al@bigblackdot.net wrote:
> Hi All...
> I've been working on a 70 FI and the tank was so rusty and varnished
> that it was restricting fuel flow.
> So I decided to restore it with the POR15 tank sealant.  I've done it
> with an oval-era tank and it was a breeze.  That tank I redid is
> absolutely excellent.
> So, I said to myself, it should be that easy again since there can't be
> that much difference in the T3 fuel tank.  Right?
> evidently...  not so.
> I removed the gas tank to clean and prep, no problem, but what I hadn't
> noticed in the FI years was not included in the carburetor years.  A
> metal cup surrounding the supply and return ports in the bottom of the
> tank, just below the sender.
> Doing a little investigation I found these in the archives:
> http://listarchive.type3.org/archives/1999/december/msg00497.html
> http://listarchive.type3.org/archives/1999/december/msg00505.html
> http://listarchive.type3.org/archives/1999/december/msg00526.html
> So the cup is there only for the FI models evidently.
> Here's my question:  Is fuel supposed to be able to go UNDER that cup? 
> At this time, I can get my tank to hold water after the cup goes dry.
> which will obviously be bad later on, making my tank retain about a
> half-tank reserve! 
> Can anyone confirm that fuel is or is not supposed to travel under the
> cup to empty the tank?
> If it is supposed to flow underneath, I'll re-treat the tank for rust (I
> have not sealed it yet) and hope that cures it.
> If that doesn't work...  how much damage could I do by **carefully**
> drilling some vent holes in the cup to allow for flow?
Not only is that cup in the FI T-3's but is in the carbed ones too.

This sketch is compliments of Dave Hall's site.

Russ Wolfe
'71 FB AT
'66 FB MT
'64 T34 (not running)
'65 T1 (not running)
'05 KIA Sorento SUV

List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org

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