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    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    The latest . . . I uploaded a zip file with several test runs in the lake, under load (a few posts back). Some test runs failed as expected, some others work just fine, like nothing was wrong, and achieved 5800 rpm, max for this engine. It was 50/50. Here’s the really strange thing, brought...
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    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    2017. Not sure what the lobe is. But, after removing the HPFP each time I looked down the hole at the cam it rides on. Admittedly without a flashlight, but under sun light I didn’t notice any excessive wear or scarring. The push pin on the HPFP looked good. Can send pix of that if needed.
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    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    Thanks for your input. Open to trying it.
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    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    Thanks for the deep look and trying. I appreciated it.
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    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    Anyone still out there? Not sure what to test next. I ordered a new hose to replace the one that goes from the low and intermediate pumps to the HPFP. Desperate move on my part. I’ll replace that when it comes in (special order) and post the results here. Very open to trying anything...
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    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    Hey Gents. The GM techs couldn't make it this weekend. We're going to try again next weekend. Was able to run the boat in the water and record several test data files (attached.) Some of the tests were slow ramps and others were fast / quick to full throttle. You'll notice with the...
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    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    Hey everyone, I'm back. I will drop the boat in the water this weekend and run the slow ramp up tests again and record the data. In the meantime, @Lpgc, thanks for your input on this. To answer the ownership question, I've owned the boat for 7 years now. This is the first sign of engine...
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    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    I appreciate everyone's input so far and I think we are close. I have to step away on a business trip. I'll be back 10/14. If you think of anything in the meantime, please let me know. Open to any suggestions or other things to try. I'll check back soon. Thanks again!!
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    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    Great thoughts. Some data points to respond to your questions: Low and intermediate pressures stay in the normal range even when the high pressure drops. Intermediate stays at 70-80psi. Never drops below 70. Help me out here, but it seems the measurements I took with the scope (see video...
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    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    The boat is not in the water. In the .rec files the Engine Load data is all around 10%, until the problem happens, then it sores. I believe because it's calculated off other sensors that also sore because the ECM is trying to increase the actual RPM to the commanded RPM. This might explain...
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    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    For reference, here is the engine system information.
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    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    BTW - I could run a test and shut down any injector I needed, but the engine would be limited to 2000 RPM, so I didn't try it.
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    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    Here is the video of the HPFP PWM signal. Measured at the HPFP connector. You'll see as RPM increase the time base for the signal shrinks. This is what I would expect. But I think the most important factor here is that you can hear the Engine start struggling, then, the HPFP PWM signal...
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    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    Here are all the data files. Each run with a engine start and slow RPM rise (over ~2 minutes) until failure. Then held the Throttle open as long as I dared as the engine would spit and sputter.
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    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    Ok. Got all the data. I'll post it in a separate post. I didn't see the HPFP PWM so I recorded it on my oscilloscope. Vid coming. The categories I had are:
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    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    Great insight. Not sure this changes things, but I'm running it out of the water, the engine is under no load. When I do put it in the water I get the same results, but as you suggested, I might see higher IPW signals because the engine is under load. Engine is 8 years old. I don't think...
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    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    This is very helpful. I do have several data sets as well. I'll record all I can using the test format you outlined. If I see the HPFP PWM I'll let you know. BTW-I'm told from the Volvo Penta dealer that you can re-program most marine ECM's but not Volvo Penta. Or at least the one I have.
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    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    I found the PWM in the data set in the .rec files I sent earlier. See it below at the bottom of the chart. It's measured in milliseconds. Starts at .9ms then starts to climb when the rpm drops. Kinda tells me the ECM is working if nothing else. There is a braided flexible line from the low...
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    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    1st paragraph - Agreed. See above. Fuel pressure to RPM Chart. This engine is running almost exactly to that chart. Injectors are all new. Fuel pressure in this system is maintained with the ECM. The ECM then controls the injector with a PWM signal to deliver the right amount of fuel based...
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    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    Checked the wiring and it was a little close to the alternator so I moved it a bit. Not even close to the coils. Put in a new MAP sensor, still the same issue.
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