Compression Ignition Addict
Join Date: Nov 2011
Location: The great state of Warshington
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Definitely dump the tank if it's been sitting half full for that length of time with no additive. If the tank had been full to the top, or an additive had been added it would be a different story (possibly).
Diesel doesn't go bad like gasoline. The cetane rating does degrade over time, but no-where near as quickly as octane. Emulsified water is the killer when it comes to diesel sitting for extended periods. Water means algae, and algae spells trouble for every component of your fuel system. I've burned diesel that was at least 7yrs old with no issues, but it was stored in a agricultural holding tank with the proper additives and had water drained off at regular intervals.
Drop the tank, and fill it with a few gallons of gasoline. This will act as a solvent and remove a good amount of sediment from the tank. Drain the gasoline and refill with fresh diesel, along with Seafoam Diesel Kleen, Stanadyne or another additive of your choice. Could also fill the fuel bowl with one of these additives, or ATF to purge the injectors.
Expect you replace your fuel filter and clean the FPR regularly (every 500-1000 miles) or so to start as you will have a lot of crud coming out of the fuel lines.
Chrome don't get ya home