Turned out the use of B99 had eaten the rubber fuel filler seal and the cap. When driving the car, it allowed the fuel to slosh out and then drip back down the filler into the trunk. Bypassed the excess fuel escape hole, because the cap kept it in the loop.

clay

On Jan 19, 2010, at 11:21 AM, Dillon, Meade M CIV SPAWARSYSCEN- ATLANTIC, 53310 wrote:

Another trick that I've heard about but never witnessed is called
'pressing up' the tank, whereby you fill it with water so that the fuel
is pressed up to the top of the tank, and then you weld so that the
water gets heated and not the fuel.  How do you keep the water leaking
out of the break from mucking up your welding?  I don't know...

-Max

-----Original Message-----
From: mercedes-boun...@okiebenz.com
[mailto:mercedes-boun...@okiebenz.com] On Behalf Of Jim Cathey
Sent: Monday, January 18, 2010 9:14 PM
To: Mercedes Discussion List
Subject: Re: [MBZ] fuel leak

What do I use to weld this?  Torch?

Fuel tank welding is rather tricky.  I've done it.  The secret
ingredient is a lawnmower putting away filling the tank with non- oxygen,
and keeping it that way.

I don't really recommend it.

-- Jim



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