I ran out of gas, started later but shut right off now cranks but won't start?

What is your question?

my 1996 Volvo 960 ran out of gas, I then tried to start it a few days later it started right up but only for a few seconds then shut right back off.I Then I tried to start it again a few days later and it would not start or crank at all just make this clicking sound when trying to start it. Then I took it to repair shop and had them put a new fuel filter on it but still no change did exactly the same thing when I tried starting it. So I then took it to another repair shop and they checked it for fuel line cloggs, bad spark plugs etc..He still could not figure out or diagnose what the problem was.When I went to pick it up I tried to start again no crank no start just a clicking noise.He told me it was getting gas to it and he also suggested it might be an electrical problem or issue that it was but he was not sure on that. A few days after he looked at it I tried starting it up. There was no more clicking noise it stopped completely and its cranking now but still no start. What is wrong

What makes this problem better or worse?

After changing the fuel filter the clicking when trying to start it has stopped completely and it's now cranking. Before it would not even crank just clicked when trying.

How long has your 1996 Volvo 960 had this problem?

Problem all started 2 or 3 days after I ran out gas by accident before this it was running great no problems at all.