Navy T-34C's have a rubber bladder lining of the fuel tanks. They use
jet fuel so it's not an issue of ethanol but more of a if there is a
leak just replace the bladder solution.

Not sure about your fuel tank design but could you not use some sort of
a liner?

Mark

On Aug 16, 2013, at 7:23 AM, Ernest Christley <echristley@att.net>
wrote:

I think this is going to be the solution, Lynn.  The tank isn't

exactly smooth at the outlet, so I'm going to have to make some
modifications to the general concept, and I may end up with a bit of
unusable fuel, which I don't have now.  But, I have a bulkhead fitting
on hand, so I'll at least give it a try.

On 08/15/2013 12:41 PM, Lehanover@aol.com wrote:

If the tank is smooth on the inside. You could hand ream the hole

out to big enough for a bulkhead fitting. The long run of the fitting
would go into the tank. Make up a thick aluminum disc, big enough to
cover the crack. Use fuel tank sealer in the hole and under the washer.
Tighten the jamb huts with sealant under each.

You could have the same washer under the bottom side as well.
Now the crack is covered top and bottom with sealant and washers.

Trim off any excess fitting and radius inlet to improve flow. The
fitting can now be pointed in any direction.  I can make a drawing if             you need one.

 
Lynn E. Hanover    
 
In a message dated 8/15/2013 10:30:37 A.M. Eastern Daylight Time,

echristley@att.net writes:

The Delta has one ~50gal tank that sits behind the back seat.  Not wishing to fight the compatibility issues between epoxies and

whatever

the government may mandate be put into our fuel supply next year, I

went

with an welded up aluminum tank which I epoxied into the turtleback.

For fittings, I welded in two NPT adapter bungs to the bottom of the

tank.  One for fuel supply, and one for return.   I had a small,

seeping

leak at the supply fitting. I needed to turn the NPT-to-AN6 90

degree

adapter one more turn to make it seal.  I got it most of the way

around

before I heard a sharp ping.  The bung that I welded in is now

split.  

And that split is guaranteed to expand with vibration.

The only solution I can think if is to cut a round hole to remove

the

bung, and then construct two plates (one for the inside of the tank

and

one for the outside), with a hole in the center for the 90 degree adapter.  The problem is, the tank can now be viewed as a bomb.  How

can

I cut a hole in the bottom of the tank, which will require that I

work

in an enclose space, without the possibility of a spark making short

work of everything?

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