When I started my 743 today it ran for a minute or two and then acted like it ran out of fuel. I primed the bulb at the fuel filter and I could hear air leaking when depressing the primer. The machine initially would not restart but did re-fire. I turned the machine off and left it in the barn. Right before it restarted I could feel liquid on my hand dripping down underneath the fuel filter. Apparently it is leaking fuel somewhere around the filter. My assumption is that it was sucking air in the line causing the machine to die. Should I replace the filter and go from there and can someone offer advice and what precautions to take.