It has fuel at the pump it had fuel at 3 and 6 when it was running but now don't seem to have fuel at any now.
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Get yourself a REALLY bright flashlight and look down in the fuel tank. It has been sitting for about a year? It may be that you have an algae farm growing in your tank. Then you went to start it up and slurped that nasty goo up into the fuel system... There really isn't anything good to dissolve it. Might be worth getting a clean drain pan (maybe walmart for a 48 quart tote) big enough to capture the fuel as you drain the tank. If it comes out clean and clear, shine your light in the tank and see if the pickup tube and screen are clear and clean.
Unscrew the plate that holds the pickup tube and make sure you have a clear tube with a few puffs of air. While the pickup tube is disconnected, follow the fuel lines forward. First piece of rubber - disconnect and blow the tank tube out and see if any slime flies out. Keep following the fuel path. There are two. One to the Injector Pump (IP), the other is a return line to the tank. Check both as you go. HOPEFULLY none of the slime made it to your IP.
You might also look at maybe even change the fuel filter.
Pipe cleaners come in 36 inch lengths. Craft stores are a good source for those. One by one, remove and clean the steel lines from the IP to the Injectors with the pipe cleaner. ALL on the assumption that you have green or brown slime growing in the tank.