Personally I would not use an air wrench to change a fuel filter.
To keep things from twisting/rotating, the best way is to use a 2nd wrench - 1 wrench to hold things still and another to tighten the bolts. The fuel filter has a bolt-head shape cast into each end of it for this purpose.
As for leaking fuel, if you depressurize the fuel system first, then no fuel will "squirt" out of the loosened fittings, however you will still lose some fuel to gravity since the filter is the lowest point in the system. Maybe 1/2 - 1 pint? If you have one of those oil change pans just put that under the filter after you loosen it up.
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Matt L. -- Cary, NC -- '91 740 wagon
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