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  1. harringtondav

    Trailer Tongue Too Long?

    New boat and trailer four years ago. Shorland'r trailer under a Regal 1900ESX. No complaints when towing. Good tongue weight and disc surge brakes. But I'm more challenged backing than with the previous shorter rig. I don't have the measurements, but the trailer rear tire distance from the hitch...
  2. harringtondav

    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    Interesting. I believe the VP 4.3 DI engine is a GM 4.3 liter v6 ecotec3 lv3 for the most part sans exhaust manifolds, cooling, ECM etc. I wondered if you got the Delphi/Delco p/n from the VP HPFP. I was poking around an found the HPFP at a considerably lower cost than VP. I buy only boat OEM...
  3. harringtondav

    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    You can attach the .rec files in a 7z zip file. Open the Diacom 'record' folder and right click on the file or files you want to attach. Select "Compress to...", and select 7z file. It will take a few seconds before the 7z file shows in the folder. These can be attached.
  4. harringtondav

    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    To attach a .rec file, open the Diacom 'record' file and right click on the file or files you want to attach. Select "Compress to...", and select 7z file. It will take a few seconds before the 7z file shows in the folder. These can be attached.
  5. harringtondav

    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    I'm air grabbing here. I suspect the high pressure relief fuel goes back into the fuel supply port's line against its 65 psi max pressure. The diagnostic manual states the supply pump is PWM to regulate its pressure, so I assume it would back off to compensate. ....haven't seen this on with...
  6. harringtondav

    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    Still digesting what I've learned from you and @muc. HPFP is PWM. Earler this summer I was chasing a performance problem on my G5 250 hp engne. Muc suggested my low cranking voltage, similar to yours, could be messing with the ECM initialization. I replaced my four year old battery and saw some...
  7. harringtondav

    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    I'm seeing the same data. I took a closer look at the engine workshop manual and sure enough, a connector is shown on the rear of the HPFP. Also spent time studying the ECM wiring. Each rail has a connector, and per the OP the starboard gets a signal from the ECM for fuel pressure. I got bleary...
  8. harringtondav

    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    I'm trying to invalidate my theory that the HPFP displacement is fixed. I'm mostly relying on VP's part diagrams per the attached link. I'm using my 2022 250 hp G5 engine s/n which I believe is identical to yours sans ECM. The HPFP shown doesn't show a harness connection. But both port and...
  9. harringtondav

    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    Great, I see you also have the ECG diagnostics manual. When I say X-fer I'm referring to the two stage supply pump. I've been searching the manual for an ECM pin out diagram to see where/if the ECM regulates HPFP pressure. I can't find anything. The previous page 54 states the ECM is comparing...
  10. harringtondav

    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    Sounds like you have Diacom or similar. I believe the 2000+ psi direct injection pump is unregulated from what I see. It is cam driven and reaches max pressure at fairly low engine rpms. There may be a return/relief valve, but I don't recall seeing it in my manual. The injectors are PWM...
  11. harringtondav

    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    I had some good learning with my G5 VP 4.3 direct injection. The fuel is delivered to the rail through a two stage electric transfer pump. IIRC the low stage delivers 10-20 psi, the high stage 55-75 psi. Both stages have pressure test ports. The fuel is sent to a cam driven high pressure direct...
  12. harringtondav

    SX-D U joints and drive shaft non-repairable?

    Thanks @muc. Per your longer reply, I'm not too worried about U joints or a gimbal bearing in a dry DS bellows. VP recommends changing this @ four years. I'm getting due, but have to fab up an adapter for my chain hoist to pull the drive. ....long swim platform complications. Alpha II was all...
  13. harringtondav

    SX-D U joints and drive shaft non-repairable?

    Makes sense. My local shop rate is $150/hr. Likely $300 for the R&R. OEM assembly $700+. I've replaced Alpha II Unis several times. Hydraulic press, plates and two different size sockets should work on a VP drive shaft. New crush sleeve and cap screw are peanuts. Sierra and GLM have substitute...
  14. harringtondav

    SX-D U joints and drive shaft non-repairable?

    I'm a long way from needing major repairs on my VP drive, but I've been checking the manual, special tools etc so I'm ready. Volvo Penta Shop and my drive manual both say the U joints aren't replaceable. I'm having a hard time swallowing this. Is it true? Is there a VP p/n for these Unis? ...or...
  15. harringtondav

    Question about SX clutch torque capacity

    A few years ago I bought a prop with a RubX and was using a 1/2" drive ratchet with the drive in gear to set the hub. I was surprised when I turned the prop shaft in either F or R. The plate clutch was slipping. I know my 250 hp 4.3 produces well over 300 ft/lb torque and I didn't come close to...
  16. harringtondav

    1989 Cruisers 350 Base Timing

    Thanks. Got it. Last vacuum advance engine I timed was 33 yrs ago. ...still have my old dwell tach. Hanging on to it for nostalgia.
  17. harringtondav

    1989 Cruisers 350 Base Timing

    Thanks Manitowoc. Disconnect the vacuum advance or include it in the base timing?
  18. harringtondav

    1989 Cruisers 350 Base Timing

    My pal is replacing the points on one of his Cruisers 350 cu in SBC engines with a hall effect replacement. He's asked me to help him time the engine. If I can get him to get the engine s/n before then I will. Otherwise we will check the current timing one each engine an hope this is correct...
  19. harringtondav

    Continuing Problem with 2021 VP 250 hp 4.3 DI

    I was hoping you want to follow. I've planed a new set of recordings...to your spec. ....Mississippi river just south of Dubuque.
  20. harringtondav

    Continuing Problem with 2021 VP 250 hp 4.3 DI

    Thanks again @muc. I wasn't farting off your details. I've followed you since I joined the forum eight yrs ago. I have tremendous respect for your knowledge and diagnostic skills. I was on a tight timeline trying to get good data between weather, feedback intervals and retests before I handed it...
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