Strange Fuel tank usage

pcmpetepcmpete Member Posts: 114 ✭✭
in Rinker Express Cruisers Forum
2010 360 EC.  My starboard fuel tank level drops more that the port side.  Is this normal or what issue should I look for? 
It is not VV display issue, the fuel dock pump confirms it.  
It does the same even if I don’t use the generator.
Each tank valve is fully open and cross feed valve is fully open too.   

Any ideas???
Thanks
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Comments

  • Aqua_AuraAqua_Aura Member Posts: 2,705 ✭✭✭✭✭
    Maybe a blocked vent so it is pulling more from the starboard? 
    1997 Bayliner 3988
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  • pcmpetepcmpete Member Posts: 114 ✭✭
    Aqua_Aura said:
    Maybe a blocked vent so it is pulling more from the starboard? 
    Block vent on the port side?
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  • Aqua_AuraAqua_Aura Member Posts: 2,705 ✭✭✭✭✭
    edited February 2021
    Just a thought but yes. Maybe the vent is plugged with some nesting bugs or something so therefore it is drawing more easily from the starboard side.

    You have VV? Is one engine burning more fuel GPH? This would be a different issue. 

    I am not completely familiar with your fuel system but others on here who are familiar will have other info for you. 
    1997 Bayliner 3988
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  • reneechris14reneechris14 Member Posts: 3,134 ✭✭✭✭✭
    Cross over valve should be closed so each engine uses its own tank.
    2005 Rinker FV342  Pawcatuck river,Ct
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  • aero3113aero3113 Member Posts: 9,841 ✭✭✭✭✭
    @reneechris14 is correct, the crossover valve should be closed.
    2008 330EC
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  • Aqua_AuraAqua_Aura Member Posts: 2,705 ✭✭✭✭✭


    Apparently I suck at the clarinet 😂
    1997 Bayliner 3988
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  • pcmpetepcmpete Member Posts: 114 ✭✭
    reneechris14 said:
    Cross over valve should be closed so each engine uses its own tank.
    Ok I will try that at my next fill up.
     I hope this is not a silly question, but if it should be closed why is it where ? I am new to twin engine and twin tank setups.  
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  • Dream_InnDream_Inn Member, Moderator Posts: 7,946 mod
    It allows you to run both engines off of either single fuel tank.

    Dream 'Inn III -- 2008 400 Express

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  • LaReaLaRea Member, Moderator Posts: 8,069 mod
    For example, suppose you get contaminated fuel in the port tank.  Close the port valve and open the crossover valve -- both engines will draw from the starboard tank.
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  • Liberty44140Liberty44140 Member Posts: 4,414 ✭✭✭✭✭
    X3, when I got my 310 I had the same, one tank drained a lot faster than the other. Path of least resistance. All three valves were open. Closed center valve forcing each engine to draw from its respective tank and voila, tanks drained at the same rate (well generator side always drains a little faster due to running the genny)....
    07' Cruisers 390 (Previous Rinker's: 06' 342EC & 01' 310FV)

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  • benvenuttiokibenvenuttioki Member Posts: 131 ✭✭
    I have the same thing on my 370. Crossover closed. No gen usage. Stbd uses more fuel. GPH aren’t exactly the same, but close.
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