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I had a fuel starvation problem with my Yanmar, but it was in
starting, not whilst it was running, though I seldom use the
engine other than for leaving and arriving at the dock. It was due
to air in the engine fuel filter housing. I had changed the engine
fuel filter, and whilst all looked well after bleeding, the
problem was traced to the O-ring at the bottom of the filter
housing. Having change the O-ring and made sure that it was
properly seated, I have not had a problem since. You might want to
check this area also as from what I read, your mechanic had taken
the engine fuel filter off.
Ian Shepherd SM2K 414 Crusader -Cyprus
On 14/06/2020 05:48, Michael &
[Edited Message Follows]
Update on Fuel issue.
[Reason: fixed Razor to RACOR]
We ran the engine for a total of 14 hours on our passage into the
Chesapeake Bay and up north to Cambridge MD.
Three hours of these were at 2100 RPM.
NO further issues.
Thank you all for your helpful suggestions.
I have no proof but the most likely explanation is that the air
was introduced when the mechanic took the RACOR filters out for
visual inspection and put them back in stating that they are in
excellent condition and do not need to be changed.
I assume our heavy rolling had pushed the air toward the engine.
To James point I have a suspicion that our fuel vacuum gauge may
have failed too.
Given how little fuel our 100hp diesels consume and with a full
tank I expect not much of a vacuum unless the filters would be
really clogged badly.
I consider to replace the mechanical gauge with an electronic
vacuum sensor and wire it up to an instrument at the engine
I still have to investigate why the sensor on the engine fuel
filter doesn't show on the engine control panel.
Reading Kent's post I will definitely change the RACOR filters and
the engine fuel filter.
My question now is how do you get the air out of the RACOR filters
after changing the cartridge?
Michael & Robyn
SY RIPPLE SM2K # 417
now in Cambridge MD USA