This fitting can indeed rust pretty solidly.  I would soak in liquid
wrench for a couple of days, and tap the fitting with a hammer every once
in a while.
I don't know what kind of head it is, but if you find a box end wrench to
fit, you can slide it over the fuel line after you disconnect the other
end.  Hit the wrench with a hammer, but be carefull not to strip it.
Ulix
On Tue, 18 Aug 1998, William M. Gilroy wrote:
> Is the fuel outlet line from the fuel tank a Whitworth
> size?  None of my standard flare nut wrenches fit correctly 
> on the flare nut that is on the fuel line at the gas tank.
> The closest is a 9/16" which is too small, and the 5/8" is too large.
> I have sprayed the nut with liquid wrench to help loosen the
> nut.  Does anyone have any suggestions on how to get this nut
> loose.  I need to clean out my tank.  I figured I would ask
> here before I bugger up the nut.  I guess I could apply a large
> set of pliers, but I would only want to do that as a last resort.
> 
> Thanks,
> 
> -----
> Bill Gilroy
> wmgilroy@lucent.com
> 732-957-4775
> 
    Ulix                                                    __/__,__        
.......................................................... (_o____o_)....
                                                           '67 Sprite
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