glow plug fuel

[20abc]

does anybody know if a new 4 stroke glow plug engine needs a better fuel to run than an older and very well run in engine of the same make and type? Obviously the fuel gradually deteriorates even when stored carefully, my question is does a new engine need a fuel closer to perfection than a looser better run in engine.

Thanks. Barry Reeves. Pilgrim Locomotive Works

 

[ironpot]

In short,no. Fuel age is not critical with carefully stored fuel, blended with top quality components.
Even with some water absorption, most fuel still performs satisfactorily in a wide range of applications, just look out for bearing corrosion.
What is critical is whether synthetic or castor is being used, most modern engines don't run best on castor, and whether ratio is correct for the conditions.