Rotary Fuel injector pump Failure

[Chris Andrews]

I have twin Yamaha ME422 STI engines on a 2 year old 11 m rib
at 180 hrs one of the denso rotary fuel injection pumps seized after a 3 hour beginning
of season run without problems.
There was no solid contaminants in the fuel pump found.

Is this due to Ultra low sulphur red diesel with poor Lubricity?

Fuel additives seem to be essential to prevent this happening.

Can anyone source PRI-D complete diesel treatment in the UK?
good research by Ralph E Lewis 27th Dec 2009 on protecting marine fuel pumps.

Yamaha and other engine manufacturers should be recommending an additive as clearly their engines are not fit to cope with the diesel that is now supplied!

[BogMonster]

I thought the Yams were marinised Toyota Landcruiser engines in which case I would have thought they should be pretty tolerant as far as fuel quality was concerned. A rotary pump should certainly be a lot more tolerant than the modern whizzy common rail systems.