Converting Diesel Tanks to Petrol

Discussion in 'Boat Design' started by CalypsoBoat, Mar 22, 2012.

  1. CalypsoBoat
    Joined: Mar 2012
    Posts: 2
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: muscat oman

    CalypsoBoat New Member

    Gents, I am converting 20 year old 38 foot boat that had Diesel sterndrives[2x225hp]. I am now putting a transom bracket with outboards [2x300hp].

    My Question is how do I flush or clean the two 500litre diesel tanks and make good for petrol? [they are aluminium I believe]
    I intend to replace the lines but the tanks are built into the boat.

    Appreciate any advice you may have.
     
  2. CDK
    Joined: Aug 2007
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    Location: Adriatic sea

    CDK retired engineer

    Buy a can of garage floor cleaner. It is a petroleum distillate combined with a detergent that dissolves the tank sediment. Let it soak for a few hours, then use a pressure cleaner or a garden hose; sediment, cleaner and water form an emulsion that you can easily pump out with a bilge pump or flow-jet pump.
     
  3. CalypsoBoat
    Joined: Mar 2012
    Posts: 2
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    Location: muscat oman

    CalypsoBoat New Member

    Thanks CDK - after that do I rinse it out with petrol?
     

  4. CDK
    Joined: Aug 2007
    Posts: 3,324
    Likes: 147, Points: 63, Legacy Rep: 1819
    Location: Adriatic sea

    CDK retired engineer

    I don't think that's necessary. But it is important that the tanks are completely dry before they are used. Drops of water on the bottom of an aluminum tank are incredibly corrosive.

    In your location the sun and dry air will probably remove all traces of moisture within a day.
     
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