Tony,

Before 1989, the fuel pressure regulators are waaaaay different than the cinchy LH 2.4 regulators that are held in place with two 10mm screws and a hose clamp.

The LH 2.2 regulators mount to the fuel rail with a flare or compression like fitting instead. Then there's a bracket that the regulator is held onto with a giant nut that slides over a threaded portion of the nipple for the return line to the tank:

http://picasaweb.google.com/RyanR76/1987Volvo245/photo#5096361935106612914

To the original poster, try the one-hand squeezing approach I mentioned. If that big nut still wont come off, try bonking it lightly to help free up the threads. It's important to use a good wrench or socket here. An adjustable wrench can round stuff off.

-Ryan

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Athens, Ohio
1987 245 DL 314k, Dog-mobile
1990 245 DL 134k M47, E-codes, GT Sway Bars
1991 745 GL 300k, Regina, 23/21mm Turbo Sway Bars
Buckeye Volvo Club