Unless the tensioner dies, the timing belt NEVER jumps. I am glad you resolved the LMS. You didn't have to remove the fuse, just push the pedal to the floor which will turn off the injectors.

The fuel return line is at the pressure regulator. You will find the FPR on the subframe behind the engine, just follow the fuel line down the back side of the engine.

To figure out if the the fuel pump relay is working, turning the key to position II will prime the pressure (listen for a short humm from under the rear seat). The relay is under the top of the fuse box, I suggest carrying a spare in the glove box - at least a thick paper clip to use as a jumper wire.

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My back feels better when I sit in a Volvo seat