[v8volvo]

Sounds like no fun, sorry to hear. Give us a little more info and we'll help as best we can.

You said it ran after you picked it up from a tow yard, but then it died. When it died, what exactly happened? Just shut down suddenly with no warning, like if you had switched off the key? Or stumbled, smoked, lost power, then died, as a more gradual progression? Any unusual noises, smells, leaks, dashboard warning lamps, high temperature gauge readings, etc when it happened?

Did it die while stopped and idling, or while driving normally down the road, or in the midst of a full power WOT acceleration? Any other special circumstances?

How was it running in the minutes before it quit? Like normal? Or any clues of trouble?

When you tried to restart it after it died, what did it do then? And what does it do now? Cranks but doesn't catch? Or does it not crank at all?

If it cranks, does it act like it's trying to start, make any smoke out of the exhaust, etc? Or not seem like it's even close to firing?

When you did the timing belt (or had it done?), what tools and methods were used? In particular what technique, equipment, and torque spec were used to install the front crankshaft bolt?

How much fuel is in the tank? Engine fluids (oil, coolant) all normal level, color, condition, smell?