After you refuel with new diesel fuel, you should open both fuel filters (Primary - possibly a Racor,, and then the Secondary Yanmar Fuel Filter on th top Starboard front side of the engine). If the Filters have not been changed in a while, this would be a good time to replace them. With Filters in place, pour in some diesel fuel to fill the cannistor as much as you can. After the filter cannistors are in place, you will need to loosen the bleed screw on the top of the secondary Yanmar filter. Make a small "halo" by twisting a small piece of paper towel and putting it in a circle around the bleed screw to absorb any fuel coming out. Go to the bottom Starboard side of the engine and feel around for the manual Fuel Lift Pump Lever about half way back. You will need to flip that up (it self returns) about 50 to 200 times. What you are doing is bleeding air out of the fuel lines from the tank up to the Yanmar fuel filter. Around the paper "halo" you get air coming out and some fuel bubbles out and finally some diesel fuel squirts with each lever flip. That should now have bled the air out. Diesel Engines don't like air in the fuel and just don't want to run. Tighten down the Bleed Screw, after you replace the small copper compression washer under the screw head. Now try starting the engine. It should start after a several cranks to get fuel up to and thru the Injectors. If not, you may have to bleed air out at the Injectors, but cranking the engine over may force the fuel up to the Injectors. Good luck with all of this. It's all part of the diesel engine learning process. Don't be afraid to tackel this task. The 2GM20(F) is a great little engine - I've heard diesel mechanics refer to it as "bullet proof" - it's hard to hurt it.