I have a 27 foot Sportcraft with twin 01 Yamaha 150 hpdi's. Each engine has 202 hours and I've owned them for half of that. This past weekend while using the boat I was cruising and each engine was running at approx 4500 rpm. Suddenly my poet engine dropped about 1000 rpm and then surged 2-300 rpm before ultimately limiting itself around 1500 I turned engine off restarted and tried again it worked well for approx 3-4 mins and then started the same thing and the engine occasionally bucked. The following day I took the boat out with my fuel pressure gauge attached to the vst and while trying to load up the engine the pressure stayed consistent at 50 psi. After connecting yds up I noticed that there's a code 26 set at the 202 hour mark. I then ran an injector test and all six functioned. After speaking to a fellow member who said he had similar issue I swapped the injector driver assembly with no change. Today I went back to the boat with my laptop to try again this time while trying to load up the engine I noticed the fuel pressure field went red and the value dropped to 500 instead of being in the 725 range, this is when the bucking started and eventually a stall. The engine also is stalling out under idle conditions when driving out of the harbour. Ive read a lot about mystery filters but I'm unsure if the low fuel pressure readings I'm seeing are measured before or after those filters... Any thoughts or suggestions would be greatly appreciated... I'd love the chance to talk one on one with a Yamaha hpdi guru if anyone has a suggestion on that. There are not a lot of hpdi's in my neck of the woods so I'm sorta on my own.
I was referred by another forum to find rodbolt17... so hoping he has some input on this situation... I have also replace the MP filter and still no change and engine stalls a little more under idle conditions... I have mystery filters on the way just in case.
I was referred by another forum to find rodbolt17... so hoping he has some input on this situation... I have also replace the MP filter and still no change and engine stalls a little more under idle conditions... I have mystery filters on the way just in case.
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