Wondering:
- Is there some recommended interval/ run-time to generally keep any generator at peak readiness/efficiency?
- Like "once a year for an hour"?
Or is that one of those simple questions without any simple answer?
One consideration is turnover of fuel sitting in the fuel tank, fuel filters, fuel lines, fuel injection pump, etc. With today's diesel fuel containing any % of Biodiesel it does not have as long a shelf life as what was once pure 100% diesel containing a higher sulfur content. As today's BioDiesel laced fuel ages, it attracts even more moisture since BioDiesel is hydroscopic, due to tank breathing and can also react to various metals over time. Fuel that is left to stagnate tends to gum up the works if left there too long...potentially affecting injection pumps, ck valves, etc. My rule is to try to exercise my generators for a minimum of 1 hour under >50% load at a minimum of every 90 days in summer and once a month in winter to circulate & burn fuel and heat up the oil real good to burn off moisture and lube engine internals.
During summer months I withdraw fuel from my aux tanks via external pump to run my tractor and lawn mower to cycle through it. I try to turnover my treated diesel at least every two years in any tank that has a vent, sealed Jerry cans could go longer. When vented tank fuel gets older than that it seems to become more susceptible to promoting growth of biomass. I've had diesel in a vented aux tank that was treated and stored for 4 years but it started to develop strange colors on the surface but it did run my tractor just fine but I would not have wanted it to sit much longer. I think its better to have a routine to rotate fuel stock if you can consume it by doing work if you have other diesel powered machines or vehicles available.