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Yanmar 2GM injection pump issue?
Thought I might find answer searching forum, but didn't.
The problem: No fuel to injectors.
Background: Clean tank, fuel, filters. Motor was running fine. Sucked air into fuel system (fuel tank issue, beyond scope of problem here). This has happened twice before recently. Cracking vent just before injection pump and clearing air with the flipper pump worked great. Then about 15 seconds of cranking would clear the balance of air and motor would start and run normally.
The problem: Last week, same issue - sucked air. Bled to injection pump as before. Motor did not start as before. Cracked fuel line at injector and used flipper pump for what seemed like 1000 strokes. No fuel. Then I tried cranking motor with fuel line cracked at injector. Lots of cranking, NO fuel. Verified had fuel to injection pump.
What could this be besides failed injection pump?
Would running out of fuel cause injection pump failure?
Is there any procedure short of injection pump rebuild/replace that could get me going?
Finally, if it is injection pump, what would be best DIY procedure to get going. No Yanmar experts around here. I've pretty much got to fix it myself. Fairly mechanically savvy... not afraid to dive in. Just want to be smart about it. Thanks in advance for any guidance.