First I would never talk to, see, associate with, etc who ever recommended you use a torch of any kind around a fuel pump or fuel tank. Your life is worth much more than the car.

Now, I may try a heat gun (no flame) or hair drier. You could also try putting as much pressure on it with wrenches as you can and hit the end of the nut with a hammer, not a big one, just a tapping hammer.

PaulM

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84 500 SEL (307,xxx miles)