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I have a pair of 2005 200 HPDIs with about 700 hours on each engine. I am the original owner. I have been diligent about scheduled maintenance and replacing the fuel filters in the bilge. I have had very few mechanical problems with these engines – the voltage regulator on the starboard engine had to be replaced a couple of years ago and the medium pressure pump on my port engine failed last year. I am way overdue for service on the high-pressure fuel pump and associated filters. The fuel injectors have never been serviced. I have the software program to analyze engine function. I've only tested the engines at idle in neutral and in gear up to about 800 RPMs. The normal fuel high pressure range provided by the software is 725+/-116. Over three scans done in the last nine months, my starboard motor has been running 696± 2 and the port pressure has been 712±3.
I typically run the engines at wide open throttle for a couple of minutes headed back into the ramp to check to make sure that they are turning the usual number of RPMs. The engines have been very consistent and both of them have been turning 5300 – 5400 rpms in smooth water, with the tabs up and the motors trimmed out. The last trip, the starboard engine was only turning 5200 RPMs, but that's only about a 2% decrease.
My question is, since I am overdue on a time basis for the high-pressure pumps to be serviced, should I go ahead and have them serviced even though they do not seem to be malfunctioning? Do the high-pressure pump usually fail suddenly or do they gradually lose the ability to generate that very high pressure? I am also inclined to have the fuel injectors serviced at the same time.
I typically run the engines at wide open throttle for a couple of minutes headed back into the ramp to check to make sure that they are turning the usual number of RPMs. The engines have been very consistent and both of them have been turning 5300 – 5400 rpms in smooth water, with the tabs up and the motors trimmed out. The last trip, the starboard engine was only turning 5200 RPMs, but that's only about a 2% decrease.
My question is, since I am overdue on a time basis for the high-pressure pumps to be serviced, should I go ahead and have them serviced even though they do not seem to be malfunctioning? Do the high-pressure pump usually fail suddenly or do they gradually lose the ability to generate that very high pressure? I am also inclined to have the fuel injectors serviced at the same time.
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