Draining old fuel

Discussion in 'Classic Sea Rays' started by Loyd Dinneen, Jan 5, 2021.

  1. Loyd Dinneen

    Loyd Dinneen Active Member

    484
    Jul 29, 2017
    Las Vegas
    1977 Sea ray 240 SDA cruiser w/ twin 470 mercs.
    Twin 470 Mercruisers
    Has anyone tried removing old fuel from a boat? I have a 1977 Searay 240 srv 24ft Sundancer with twin 470 mercruisers. I have been working on it for a year or so and it has about 40 gals of fuel in it that is a year or so old and I feel it is most likely gone bad by now.
     
  2. Juliery

    Juliery Well-Known Member GOLD Sponsor

    706
    Sep 26, 2020
    Home
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    I have had older fuel without stabilizer where I drained half the tank into Jerry cans. I then filled the tank with fresh, mid grade fuel and ran the boat. Zero issues. Then use up the other half from the cans. You may want to change gas filters afterward.
     
  3. Little Ducky

    Little Ducky Well-Known Member

    Jun 5, 2017
    Dickson, TN / Chattanooga, TN
    1998 290 Sundancer
    Twin EFI 5.0L w/Alphas
    Kohler 4kW
    I bet you the fuel is still good to go.

    Does it smell bad?
     
    Juliery likes this.
  4. HawkX66

    HawkX66 Well-Known Member

    Jul 27, 2020
    SE Virginia and NH
    "Tread Knot"
    1997 Sea Ray Sundancer 290DA

    2020 F350 6.7L
    454 L29 Carb w/ Bravo III
    If you're sure you want to get rid of it, you can use an electric fuel pump to pump it out.
     
  5. Loyd Dinneen

    Loyd Dinneen Active Member

    484
    Jul 29, 2017
    Las Vegas
    1977 Sea ray 240 SDA cruiser w/ twin 470 mercs.
    Twin 470 Mercruisers
    Thats one way for sure.
     
  6. HawkX66

    HawkX66 Well-Known Member

    Jul 27, 2020
    SE Virginia and NH
    "Tread Knot"
    1997 Sea Ray Sundancer 290DA

    2020 F350 6.7L
    454 L29 Carb w/ Bravo III
    Lol. Hope you're joking.
     
  7. Loyd Dinneen

    Loyd Dinneen Active Member

    484
    Jul 29, 2017
    Las Vegas
    1977 Sea ray 240 SDA cruiser w/ twin 470 mercs.
    Twin 470 Mercruisers
    To pump that much fuel all at once would burn up an electric fuel pump, I have a syphon hose system that I can use if I go thru the fuel sender hole and just haul the fuel cans up out of the cabin. Thats one plan.
     
  8. HawkX66

    HawkX66 Well-Known Member

    Jul 27, 2020
    SE Virginia and NH
    "Tread Knot"
    1997 Sea Ray Sundancer 290DA

    2020 F350 6.7L
    454 L29 Carb w/ Bravo III
    If you say so. Sounds like you've got it figured out. Good luck.
     
  9. Juliery

    Juliery Well-Known Member GOLD Sponsor

    706
    Sep 26, 2020
    Home
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    Use an inline fuel pump (designed for continuous operation) and certainly ignition protected so no spark issue. The flowing fuel keeps the pump cool so it does not burn up. It works fine. I've done it. I'd do it outside from the fill pipe where fumes can dissipate, not inside the cabin. Quick and easy.
     
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  10. sbw1

    sbw1 Well-Known Member

    Oct 10, 2006
    West Michigan
    This is listed in my signature
    This is listed in my signature
    C3B49088-512B-4AB9-94F5-014A419D1003_sRGB.JPG If it is ethanol free fuel it will be fine even with out stabilizer. Just a thought.
     
  11. boatman37

    boatman37 Well-Known Member

    Jun 6, 2015
    pittsburgh
    2006 Crownline 250CR. 5.7 Merc BIII
    Previous: 1986 Sea Ray 250 Sundancer. 260 Merc Alpha 1 Gen 1
    5.7 Merc BIII
    I drained about 25 gallons from ours. It had sat about 3 years and the ethanol had separated. Left us stranded a couple of times. Drained it and rebuilt the carb and it ran great after that. I used a shaker hose with a check ball and then towards the end I used my oil change pump bottle. Worked great
     
  12. northern

    northern Well-Known Member

    Jan 17, 2007
    Anacortes Washington
    380 Aft Cabin 1989 Charts Timezero radar Furuno
    Twin 454 strait shaft
    This works well but it is slow. We have a jetboat and have two 25 gallon spare gas tanks. To move the fuel to the main 75 gallon tank I set up a car electric fuel pump with a cigarette lighter plug on it and 20 feet of gas line hose from the spare tank to the filler cap of the main tank. Pump rate is around 1GPM.
    Gas is good for 2 years without much deterioration. Jet boat sat for 3 years once and fired up on old gas.
     
  13. northern

    northern Well-Known Member

    Jan 17, 2007
    Anacortes Washington
    380 Aft Cabin 1989 Charts Timezero radar Furuno
    Twin 454 strait shaft
    Removing the gas is not the problem disposing of it is. Year old gas will work fine in your car after you remove it from your boat.
     
  14. blaster

    blaster Well-Known Member

    May 23, 2011
    potomac river
    2010 sea ray 205 sport
    F-250 CCLB 6.2 4x4 3.73 rear.
    Mercruiser 4.3 mpi alpha 1.62
    I mix old gas with old motor oil and use it to get a brush pile ignited when I clean up around the property. The oil keeps the gas from putting off so much vapor.

    Our local recycler will also take gasoline oil mixed.
     
  15. Loyd Dinneen

    Loyd Dinneen Active Member

    484
    Jul 29, 2017
    Las Vegas
    1977 Sea ray 240 SDA cruiser w/ twin 470 mercs.
    Twin 470 Mercruisers
    I have used sour gas mixed with good gas to run in my truck, truck ran on it but not real well overall.
    Good tip on mixing it with oil for the recycler I have a bit of left over oil that I can get rid of.
     
  16. Riptide III

    Riptide III Well-Known Member

    987
    Dec 8, 2007
    Dartmouth MA
    1997 Sea Ray 400DA
    Cat 3116 TA
    1994 Sea Ray Laguna CC 250 Tohatsu
    :
    I had about 35 gallons to get rid of. I pumped it into a blue plastic 55 gallon drum that anti freeze comes in. They are probably free at your boat yard. I left it outside in he sun in the corner of my open lot with the bungs open and a fish tote sitting on top so rain won’t go in. A year latter it’s all evaporated.
     
  17. JVM225

    JVM225 Well-Known Member

    Apr 8, 2008
    Farmingdale, NY
    2002 410 Sundancer, Monaco Edition.
    3126 Cats.
    I’ve done that in a smaller scale and it worked perfectly.
    Another option that I helped a friend do:
    He had about 40 gallons of 2 year old fuel to remove, we used a 12 volt electric pump and put it in a bunch of 5 gallon gas containers.
    He brought one to the gas station with him every time he filled his truck up, poured it in the empty tank, topped off with fresh gas from the pump, and all was well.
    With regular weekly fill ups, it was all gone and put to good use in two months.
     
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  18. Loyd Dinneen

    Loyd Dinneen Active Member

    484
    Jul 29, 2017
    Las Vegas
    1977 Sea ray 240 SDA cruiser w/ twin 470 mercs.
    Twin 470 Mercruisers
    That's definitely an option , looks like I will have to get a few more containers, 12 volt pump, some fuel hose and some ambition.
     
  19. Juliery

    Juliery Well-Known Member GOLD Sponsor

    706
    Sep 26, 2020
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    Before you get fuel hose, try a long piece of hanger wire with a tight loop on the end. Just to see if the fuel filler hose is fairly straight to the tank. If so, 3/8" fuel hose should go in, too. If not you may need 5/16" to better follow the bends into the tank.
     
  20. Loyd Dinneen

    Loyd Dinneen Active Member

    484
    Jul 29, 2017
    Las Vegas
    1977 Sea ray 240 SDA cruiser w/ twin 470 mercs.
    Twin 470 Mercruisers
    If I remove the cushions in the forward bunk area and then take the starboard panel off the fuel hose is exposed and it comes down and makes a sweep to the filler neck. The fuel tank, sender, and hoses are easy to see with that area cleared out.
     
    Juliery likes this.

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