inj pump

   / inj pump #11  
" I removed the top of the cannister that contains the cartridge. There was no cartridge inside. The tractor has been operated without a filter element in the cannister. I then replaced the top, started up and drove it home"

Unless I have been badly misled about all Yanmars, this just does not sound like you were looking at the fuel bowl, and I certainly don't believe you can open the filter bowl, then restart without bleeding the lines.
 

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