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    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    Here is a zip file with the .rec files
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    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    The GM part number for the pump is not on the VP pump, but it's not on the GM pump either. After realizing the VP engine was the GM 4.3 V6, that you mentioned above, used in the Chevy Silverado 1500 (2014-2019), I ordered the GM HPFP (p/n: 12744840). It looked identical, QR codes and...
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    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    You can also take these files and rename the ending from .txt to .rec
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    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    See posts above. I replaced both O2 sensors and all the fuel injectors and the bank 2 trim fault went away. It did seem like it was in limp mode, but it turns out its just this problem we're trying to troubleshoot now. Basically the engine dies at >4300 RPM because the HPFP pressure is...
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    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    Try to get this back into one thread with this message. Ok. Many good points above. I'll try to answer all of them. If I miss something let me know. I'll do the tests listed below this weekend. 1. I'm going to pick up an Ultraviolet fuel additive and put it in the gas supply. If the relief...
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    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    Yah, this one is very illusive. I've swapped the ECT and oil pressure sensors. I think there are 6-7 sensors that are used to calculate the ECM output to the HPFP. Happy to swap more. I dumped some .rec files in one of the posts below if you want a look at the other sensors. They seem ok...
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    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    I would think that when it fails I'd get a DTC 0087. But I don't. I'm open to trying another new HPFP. It means replacing the high pressure fuel pipes again, but I am getting desperate. If we can't find the issue by this weekend, I'll order another one and install it.
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    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    I will replace the battery tomorrow and try it. My page number is different but the description was there. It seems that the throttle body commanded position changes based on "Engine RPM, engine load via the MAP sensor" data. So as this failure is happening, the RPMs are going down and the...
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    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    I've attached some .rec files. Not all are up to temp. But some are slow rpm increases and holds until fail. Other are ramps to fail. And one is for the misfire data. Can do a longer run and get you that .rec file late tomorrow. Didn't look at the system tab, but can do. The battery is 3...
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    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    Thanks for the reply. The HPFP is not wired for a relief valve. The internal relief valve seems to be just mechanical and set at the factory. No set screws to change it, anywhere. There are only two wires going to the HPFP and they, as you said, are used to control the pressure the HPFP is...
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    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    Ok Muc, I have some test results for you. Watching the voltage at startup. The battery is at 12.1VDC before cranking. During cranking it drops to 9.4 for a fraction of a second then comes back up to 14.2 when the alternator kicks in and the engine starts, about 2 seconds later. In terms of...
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    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    Great points/suggestions. Makes sense. I can hear what I think is the butterfly valve opening up while the RPM's are dropping off. I will record and check the items you mentioned tomorrow. And the cracking voltage as well. There is a braided fuel line from the second stage to the HPFP. I will...
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    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    Learning much as well. More than I thought I would need for this fix. I will check tomorrow and get back to you.
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    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    Ok. Ramped up to steady for 20 seconds here (below): Then, one second later: One more second: One more second: You can see I was throttling back here because it was dying. It then went to idle speed. I can do this over and over. Always dies around 4300 rpm. Tried throttling up slow...
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    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    Took the old HPFP apart looking for a relief valve set screw to set the pressure, thinking it might be set a little low. Couldn't find one.
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    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    Just found this on the HPFP. Seems there is a relief valve, although I don't see an external adjustment screw.
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    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    Thanks for your research and input!! I could only find this (below) that shows the signal going to the starboard side fuel rail. I traced it out and it does. But the diagram doesn't show the red line I drew which are after that connector and plug into the HPFP. One conductor is 12VDC the...
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    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    Here's the RPM to Fuel Rail Pressure chart for this V6-240 engine. 143bar = 2074psi
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    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    Great information!! Thank you. So, I'm hearing not any kind of limp mode. See my reply to @harringtondav above. The two lower pressure stages (which I believe are the X-fer's you're referring to, correct me if I'm wrong) hold their normal psi even after the high pressure pump fails and...
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    Volvo Penta V6-240 Fuel High Pressure Dropping to Zero

    Thanks for the reply and info. Agreed, the injectors are PWM controlled. Put in two new pumps now, same issue. They are CAM driven, but seem to be regulated with a signal from the ECM. I believe, after looking at it with an oscilloscope, the signal from the ECM to the high pressure pump is...
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