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Old 20-07-2014, 07:04   #1
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Volvo Penta AQAD30 loses power...

Hello!

I have Volvo Penta AQAD30 with Duoprop. 110 hp.

When i first leave from harbor it goes fine for a while and then it starts to lose rpm. Like you see in this video:



And its behavior with warm engine:



Any ideas where to start looking for possible solutions?
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Old 20-07-2014, 09:13   #2
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Re: Volvo Penta AQAD30 loses power...

SWAG, but check for a partially clogged fuel tank vent hose.
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Old 20-07-2014, 10:46   #3
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Re: Volvo Penta AQAD30 loses power...

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Originally Posted by DeepFrz View Post
SWAG, but check for a partially clogged fuel tank vent hose.
Agreed.

When was the last time the fuel filters were changed?
Have you bled the fuel system?
Are you sure about the fuel quality?

This is most likely fuel related. Start with the fuel tank vent and work your way to the cylinder.
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Old 21-07-2014, 01:17   #4
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Re: Volvo Penta AQAD30 loses power...

Thanks guys.

So i will ask from my service if they have changed filters. How about air intake? Can i try to run without that air filter?

-Could using some Red Line RL-2 Diesel help?
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Old 21-07-2014, 06:55   #5
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Re: Volvo Penta AQAD30 loses power...

Quote:
Originally Posted by alpobass View Post
Thanks guys.

So i will ask from my service if they have changed filters. How about air intake? Can i try to run without that air filter?

-Could using some Red Line RL-2 Diesel help?
It wouldn't hurt. But, unless you can see the air filter is filthy, I doubt if this is the problem. Air issues are usually not intermittent.

IMO fuel additives are a waste of money. The engine is designed to run without them. If you think you have bad fuel, try feeding the engine from an alternate fuel source. For example, disconnect the fuel hose from your fuel tank and temporarily connect it to a portable container of newly purchased fuel. You will have to bleed the engine fuel system to ensure no air is in the line when changing fuel sources. This will let you know if the tank fuel is bad.

Your symptoms seem more in line with:

  • Air or vapor lock in fuel line
  • Fuel lines partially obstructed
  • Foreign object in induction system or clogged filter
  • Water in fuel
  • Broken fuel lines
  • Air vent in fuel tank obstructed
Also, it is good practice to write with a Sharpie on all filters the date changed and engine hours at the time of the exchange.
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Old 04-08-2014, 22:21   #6
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Re: Volvo Penta AQAD30 loses power...

There is some bio-sludge in my diesel fuel. Will clean water separator and change oil filter also. Then use some serious fluids...
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Old 05-08-2014, 05:29   #7
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Re: Volvo Penta AQAD30 loses power...

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Originally Posted by alpobass View Post
There is some bio-sludge in my diesel fuel. Will clean water separator and change oil filter also. Then use some serious fluids...
Sounds like you are getting to the root of the cause.
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Old 05-08-2014, 05:39   #8
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Re: Volvo Penta AQAD30 loses power...

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Originally Posted by alpobass View Post
There is some bio-sludge in my diesel fuel. Will clean water separator and change oil filter also. Then use some serious fluids...
Mine would do this when I first purchased the boat, got worse of course. Ended up being some kind of biomass in the tank I called Tofu as it resembled that, it would clog the fuel intake pickup tube in the tank and lose RPM.
Since I got rid of the Tofu, everything has been fine
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