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I used Yami's fuel conditioner and ring free. I used Mobil automobile gas, filled by cans (a potential contaminant source, but fresher gasoline).
My problem was that I worked on the engine myself. I changed the filters (10 micron, low pressure, VST, and medium pressure) as the service manual indicated, but did not have the means to check fuel (or rail as they refer to it) pressure....and could not get Yami's service updates that increased the frequency of expensive filter changes.
The real problem, however, is that even when changing filters, very fine matter eventually makes its way to the high pressure pump filter and injectors. Both have very fine BUILT IN filters. They need to be removed and sent to Fla to be cleaned/rebuilt. This was an issue that blew my powerhead at 5 years, then recurred and basically killed the engine (new powerhead and all) at 9 years, since they needed to pull the high pressure pump, and the injectors, but the injectors were stuck and couldn't be freed without destroying them (this happened to one at five years and three at 9 years....4 years after the rebuild).
If I had another HPDI I would have the 4 accessible filters changed each year (this you can do yourself although the VST tank is a pain), have the fuel rail pressure checked each year both at idle and wide open throttle (dealer job), and I would have the injectors pulled and cleaned every 3-4 years. As for the high pressure pump filter.....pulling that is an expensive job and cleaning it requires an expensive pump rebuild, so I'd probably just pray.
I don't want to hear about any issues with the new offshore 4 stroke.....which is what I'm running now although it is too heavy for the boat.
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