I am guessing that the injection timing (hopefully not the cam timing) is off. That or the over tight belt has worn the injection pump input shaft bushing, and is now sucking air. It could be possible that you have a bad glow plug, but you'll need to check the timing first.
You can check for air by looking at the line between the fuel filter and injection pump (assuming you have or install clear tubing). If you see bubbles, you are sucking air, most likely from that shaft seal or bushing. Whatever you do, DO NOT, UNDER ANY CIRCUMSTANCES, USE STARTING FLUID (AKA ETHER) TO START THE ENGINE! Immediate damage can, and will, result.
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