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Biz603 replied to the thread 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...

Yesterday at 8:46 PM
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Biz603 replied to the thread 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...

Yesterday at 8:40 PM
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Biz603 replied to the thread 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...

Yesterday at 8:30 PM
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Biz603 replied to the thread 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...

Yesterday at 8:15 PM
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Biz603 replied to the thread 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...

Yesterday at 8:00 PM
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Biz603 replied to the thread 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...
Sunday at 7:01 PM
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Biz603 replied to the thread 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...

Saturday at 6:57 PM
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Biz603 replied to the thread 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.

Saturday at 6:49 PM
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Biz603 replied to the thread 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...
Saturday at 8:02 AM
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Biz603 replied to the thread 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.

Friday at 6:31 PM
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Biz603 replied to the thread 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.

Friday at 5:34 PM
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Biz603 replied to the thread 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...
Friday at 5:25 PM
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Biz603 replied to the thread 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
Thursday at 8:56 PM
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Biz603 replied to the thread 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...

Thursday at 8:42 PM
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Biz603 replied to the thread 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...

Thursday at 8:24 PM