I have a 1993 volvo 240 ran out of gas fuel pump and filter are less than 1 year old i put gas into it and it cranks and want to start but it doesn't. i put 6 gallons of gas any advice

It depends on how far you ran it out of fuel. If you ran it until it would not run any more and then tried to start it again several times; you may need to bleed and prime the fuel system to get it started. You start at the line coming from the tank and move toward the fuel injectors. You have to loosen a fitting and have someone pump fuel until the air bubbles stop and then tighten. A friend once worked for two hours to get his tractor started after his daughter ran it out of fuel. This is why they recommend that you do not run a fuel injected car out of fuel and if you do to turn it off as soon as it starts to miss badly.