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Volvo diesel engine problem

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  • Volvo diesel engine problem

    My boat has a Volvo Penta MD2040 engine. Starts Ok but after running about 30 minutes revs start to fluctuate a couple thousand revs (1800-1600 rpm). After about an hour it can't run at low revs and stalls at idle (sometimes the warning alarm goes off when that happens). Engine heat normal, not overheating. If engine cools down for about an hour runs OK, but after a while problem starts again. A mechanic has changed the fuel filter and tested that enough fuel is getting to the engine. Says that the fuel tank needs cleaning. I'm reluctant to go through that if something simpler can be done. Wouldn't a dirty fuel tank make the motor sputter? I don't understand the logic of how the problem occurs after the engine has been running OK for a while. Any advice?

  • #2
    It's possible that trash in the tank can gradually block the pickup screen until not enough fuel can be delivered. When the motor rests for an hour, the trash falls off the screen waiting to be picked up again.

    Was the fuel filter cut open or examined for junk?

    Has the fuel pressure been tested during the fluxing revs? I would consider that sputtering.
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    • #3
      Agree with GA. Pull fuel filter and cut apart. Get the furl sampled for biological contamination (algae).

      Marine diesel tanks often need cleaning
      1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - http://forums.iboats.com/forum/owner...988-rogue-2420

      Past Boats
      1970 Wooster Hellion - Merc 9.8
      2002 SeaRay 190BR - 5.0 - A1G2 - "Cheasheads in Paradise"
      1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

      What’s behind you doesn’t matter.Enzo Ferrari

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      • #4
        Thanks GA and Scott, good explanation of crud in tank. Fuel filter was not examined when changed. I'll try to get fuel pressure tested. What can be done if there's bugs in the tank? Does tank have to be removed to clean?

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        • #5
          guaranteed there is a local fuel polishing service that comes to your marina. I guarantee that if it is fuel issues, you are not the only one in your marina with them.
          1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - http://forums.iboats.com/forum/owner...988-rogue-2420

          Past Boats
          1970 Wooster Hellion - Merc 9.8
          2002 SeaRay 190BR - 5.0 - A1G2 - "Cheasheads in Paradise"
          1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

          What’s behind you doesn’t matter.Enzo Ferrari

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          • #6
            Sign up today
            Sounds like a diesel bug, water in fuel problem or both.
            Suck all the fuel out and replace. You'll probably find that your mechanic is right or not far off.
            If your lucky you will be able to suck it all out using a vacuum pump like the Ines used to suck oil out the dipstick on your engine.

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