HI, got to throw some more in here. There is a common saying among mechanics about a diesel hard start. If it won't start cold it is compression or cranking speed, hard starting when hot, injection pump. I have repaired that 100 series ambac pump when it was so worn out it wouldn't idle below 1000 rpm hot, but it still started cold . Just like oil pressure when cold or hot.Lot harder for cold fuel to leak past plunger than hot fuel. That being said, there are exceptions to everything of course.
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