Dan- does the genset run normally or not ?
Obviously this tells you a lot about the location of the problem.
Assuming the genset runs normally, I would check every fuel line connection from the tank to the injection pump (they can come loose).
If the genset doesn't run normally you might have bad fuel or Eric friedman's problem with the mesh filter inside the tank. He fixed it with compressed air.
Hope it's not the yanmar fuel pump.
Tom and Kirstin