any leaking fuel would let air into the system. I would change the primer pump, get all the air out and I'd bet it would stay running. Algecide and a diesel purge are a good idea . Adjusting the valves, new air filter, oil change , routine maintenance and you'll be cruising in no time.

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'83 240D 264k on 100% biodiesel/ 31mpg
83 300D 217K the $800 gem
'82 300D 267K the new WVO project car finished and driving for free
International tractor B275 on B100
Ford 555 backhoe on B100
Sargent 25 ton Rough Terrain crane on B50