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  1. harringtondav

    Continuing Problem with 2021 VP 250 hp 4.3 DI

    @muc I rechecked fuel pressures today from idle to WOT. Low pressure 10-11 vs spec 10-40. High pressure 65-70 vs spec 55-65. Little to no variation as load increased......hopefully close enough for you to take another look at the .rec files I re-ran all .rec files attached. Recorded from idle...
  2. harringtondav

    Continuing Problem with 2021 VP 250 hp 4.3 DI

    I removed the fuel inlet at the transfer pump and threaded the extractor tube down into the fuel tank. Maybe a splash of fuel remained. After refueling and getting the .rec files, I connected the gauge to each schrader valve and tune the engine to 'on'. The transfer pump cycles for about 8-10...
  3. harringtondav

    Continuing Problem with 2021 VP 250 hp 4.3 DI

    @muc More info. I checked the transfer pump pressures. High pressure =50 psi. Low pressure/internal pump pressure = 8 psi. Not good. Hopefully it explains the problem. I've noticed erratic O2 trims, closed loop switching to active and back erratically. An generally low injector pulse widths...
  4. harringtondav

    Continuing Problem with 2021 VP 250 hp 4.3 DI

    Here are the compressed .rec files. When you click to open this should show up in your downloads folder where you can open it to see the four individual .rec files. Please let me know if you have trouble opening, and if you need more data.
  5. harringtondav

    Continuing Problem with 2021 VP 250 hp 4.3 DI

    I just saw your Zip file reference. I'll try this...tomorrow. Thanks.
  6. harringtondav

    Continuing Problem with 2021 VP 250 hp 4.3 DI

    I used my engine oil extraction pump. Three bucket dumps. I spent a few hrs analyzing the data graphs. I couldn't access the fuel pump Schrader valves easily, so I moved on to recording data. My observations: Engine off, key on 22 psi. I assume the high pressure sensor is accurate at low...
  7. harringtondav

    Continuing Problem with 2021 VP 250 hp 4.3 DI

    I have the .rec files ready. I tried attaching them here, but the file type isn't supported. Also tried a pm here. Unable to attach. Requesting your email via pm, and sharing mine. Thanks, Dave
  8. harringtondav

    Continuing Problem with 2021 VP 250 hp 4.3 DI

    It is limited to 5.7-5.8 which I got with the OEM 21P prop. I'm running a 22P now @ 5.2K at about and GPS 48 mph. Boat jumped on top of the water w/in three seconds, maybe 10 seconds more to 5.2K. Yesterday I reckon over 30 seconds to max at 4.4K, 38 mph. ....seemed half power at best.
  9. harringtondav

    Continuing Problem with 2021 VP 250 hp 4.3 DI

    Thanks muc, I was hoping you'd pick up on this one. Answers to your questions: This is a rare no-CAT engine. I used my electric fluid extractor on bucket to pump the tank. I removed the tank supply hose from the transfer pump and threaded the tube into the thank. I think it bottomed. About 14...
  10. harringtondav

    Continuing Problem with 2021 VP 250 hp 4.3 DI

    Previous post I thought I'd fixed a bad fuel problem. ...the engine problems are sticking. Clean fuel, new fuel filter. Continued rough operation idle through WOT, intermittent alarm beeps, 1/2 or less power at hole shot and at plane. Strong gasoline smell in exhaust at no wake. It seems to be...
  11. harringtondav

    Chasing Down Fuel Delivery Issue

    I don't use additives in the boat or vehicles. But I did dose up the first five gallons of fresh fuel with Red Line system cleaner just for insurance. The 50:1 two stroke premix is per VP's winterizing instructions. 2000+ psi direct injection system. The two stroke lubes the high pressure pump...
  12. harringtondav

    Chasing Down Fuel Delivery Issue

    Yea, I'm spooked now. I carried in land 10 gals of gas for the previous boat w/o problems for 10 yrs. After spinal fusion I'm at the mercy of the six gas docks close by. The closest is suspect with low traffic. I'll move to one that seems to sell more gas. The crud in the filter was concerning...
  13. harringtondav

    Chasing Down Fuel Delivery Issue

    Bad fuel was the culprit. Apparently 6-7 gallons of very bad fuel left over winter. I topped off 10 gallons of fresh fuel before launching and the diluted fuel was still no good. Pumped out the tank, new filter and five gallons of fresh fuel plus a four ounces of Red Line and all is well. The...
  14. harringtondav

    Chasing Down Fuel Delivery Issue

    ....Admiral already asked me to hold back some fire starter.
  15. harringtondav

    Chasing Down Fuel Delivery Issue

    Newest version VP high pressure direct into cylinder fuel injection. I got my Diacom analyzer today and read the stored codes. Four codes indicating various misfires in two cylinders after changing the fuel filter. No sensor or device faults, including low and high fuel pressure and air intake...
  16. harringtondav

    What is the all time record for lower shift cable life?

    I changed my Alpha II after 20 yrs. It was working fine, but I was deep into the transom assy for other work so I changed it since I was looking it in the face. My carefree boating pal ignored his bad Alpha interrupt system for years and had to replace his lower cable. So I'd say the main...
  17. harringtondav

    Chasing Down Fuel Delivery Issue

    5-6 gallons from last season. Stabil treated. Another 10 fresh gallons.
  18. harringtondav

    Chasing Down Fuel Delivery Issue

    I splashed the boat a few days ago. Pulling from the ramp I got intermittent single alarm beeps. I noticed a general misfire when at no wake. Neutral rev up was fine. When I came up on plane something is definitely wrong. General stuttering and hesitation with a few more alarm beeps. Very...
  19. harringtondav

    Merc Alpha II Tools for SX Drive

    I built a full set of Mercruiser Alpha II tools 28 yrs ago. I reverse engineered the special bevel gear shimming tools, seal drivers, retainer spanners, and sneaked them through my employers tool room. For the rest I cobbled pullers, drivers etc from std tools with some tool room adds. My Alpha...
  20. harringtondav

    "Fresh" water fouling and corrosion

    I had to slip my boat the last two seasons. Normally I keep it high and dry in a marine rail lift, but water levels and spine surgery didn't allow putting the lift in. Mississippi river back water marina. No current, stagnant water. The gelcoat crud is fixable, the outdrive corrosion will take...
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