Fuel burn rate

DirtythirtyDirtythirty Delran, NJPosts: 297Member ✭✭✭
Looking for ideas as to why my engine monitoring system is telling me that my port engine is burning more fuel than my starboard engine.  Both engines are running at the same RPM, trim tabs are in the same position on both sides.  The difference is not minimal...I'd say that if my starboard is burning 13.5 gph, the computer is telling me the port is burning somewhere close to 14.7 gph.  My drives are fixed and do not trim,  and as far as I know they are aligned properly.

Other than what the computer is telling me, the boat and engines are running fine with no issues.

Volvo D6 370hp X 2
IPS 500

Thanks for your thoughts


  • Handymans342Handymans342 Cape Coral, FLPosts: 6,528Member ✭✭✭✭✭
    Did it just change?
  • Black_DiamondBlack_Diamond Holland, MichiganPosts: 4,276Member ✭✭✭✭✭
    My analog fuel flow meters always show one engine burning more than the other. Maybe ~1 gph. 

    2003 342FV "Black Diamond", 350 MAG MPI, 20P 4x4 Props, PC BYC, Holland, MI
  • DirtythirtyDirtythirty Delran, NJPosts: 297Member ✭✭✭
    @Handymans342  there was always a small discrepancy....but I don’t recall it being 1mpg or slightly more.   Maybe I’m making a big deal out of nothing. I just never noticed it before .
  • Michael TMichael T Posts: 6,347Member ✭✭✭✭✭
    ...... slight trim tab discrepancy despite what gauges are indicating, some barnacles or bottom growth more to port?
  • DirtythirtyDirtythirty Delran, NJPosts: 297Member ✭✭✭
    @Michael T   perhaps...I will find out in a week or so when I get hauled out !
  • Handymans342Handymans342 Cape Coral, FLPosts: 6,528Member ✭✭✭✭✭
    I would think that any underwater fouling would be equal on both pods therefor slowing the whole boat using more fuel on both engines and not one more than the other.
  • DirtythirtyDirtythirty Delran, NJPosts: 297Member ✭✭✭
    I'm leaning more towards the idea that it may just be an electronic anomaly.  I can't figure out how the main computer would be able to determine exact fuel burn. and then electronically adjust the injectors so as to match both engines exactly.  Its way above my pay grade, so I may just have to live with it up until it becomes an issue. As I said. everything is working great.  
  • Handymans342Handymans342 Cape Coral, FLPosts: 6,528Member ✭✭✭✭✭
    Did you ask a Volvo tech or call their Tech service?
  • DirtythirtyDirtythirty Delran, NJPosts: 297Member ✭✭✭
    edited October 2017
    @Handymans342 ; next on my list, figured I'd give you guys a try first
  • Handymans342Handymans342 Cape Coral, FLPosts: 6,528Member ✭✭✭✭✭
    Sorry, we tried. 
  • Handymans342Handymans342 Cape Coral, FLPosts: 6,528Member ✭✭✭✭✭
    Diconnect it and dont worry.  B) B)
  • zaverin1zaverin1 Saint Clair Shores,MIPosts: 1,253Member ✭✭✭
    Port always burns more
    ccwr always burns more 
  • rasburyrasbury Sanford, FLPosts: 4,236Member ✭✭✭✭
  • zaverin1zaverin1 Saint Clair Shores,MIPosts: 1,253Member ✭✭✭
    Counterclockwise reading
  • zaverin1zaverin1 Saint Clair Shores,MIPosts: 1,253Member ✭✭✭
    Most rinker are indentical when it comes to layout
    bench aft
    ans either straightl shaped seat on port
    where everyone sits usually 
    besides port using more fuel naturally it also has to work harder to keep the rpm synched

  • LaReaLaRea Alexandria VirginiaPosts: 2,662Member ✭✭✭✭✭
    If you have one engine consistently burning 10% more than the other, you would eventually have to add 10% more fuel to the tank on that side.  Do you always pump the same number of gallons on both sides?
  • Handymans342Handymans342 Cape Coral, FLPosts: 6,528Member ✭✭✭✭✭
    I know I don't because of the genny
  • DirtythirtyDirtythirty Delran, NJPosts: 297Member ✭✭✭
    LaRea  to be honest...I have never paid attention to how much fuel I put in either tank.  I have a scientific way of figuring out how much fuel goes in...I insert the nozzle and begin pumping, it is at that point that I realize the amount of fuel going into my tank is exponentially at a lower rate than the amount of cash flowing out of my wallet . The latter of which is usually empty much sooner than the former in full. 
  • LaReaLaRea Alexandria VirginiaPosts: 2,662Member ✭✭✭✭✭
    Cruise until fuel tanks are empty.  Fill tanks until wallet is empty.  Repeat.

    It's a mantra for the power boating lifestyle.
  • reneechris14reneechris14 Pawcatuck river CTPosts: 1,441Member ✭✭✭✭
    I always have trouble telling when the tanks are full I hear some gargle and stop. Always 5ish gallons different either side. Then the gauge says I could put more in. It's s good thing the beach is only 2.9 miles for the marina. Boat does not always go far.
    Power comes from fuel 
    Fuel comes from $$$

    2005 Rinker FV342  Pawcatuck river,Ct
  • WildboatingWildboating Posts: 931Member ✭✭✭
    Are you running the generator when away from the dock?  I believe it pulls from the port side tank.   Depending where you are measuring from this may explain the difference  

    2003 Rinker 342 Fiesta Vee, 350 Mag MPI, Bravo 3 2.20:1 w/ 22p 4 x4 props

  • DirtythirtyDirtythirty Delran, NJPosts: 297Member ✭✭✭
    @ Wildboating:  we have run the generators, but rarely while under way.  The last time we were out, then engine monitoring system was getting its figures just from the engines.  I am not sure, but I believe it gets its calculations from the digital fuel metering into the engines, and not from the amount of fuel in the tanks.  However, what I did find strange, is my fuel gauge has mysteriously stuck on "100%"   although I doubt the two are connected, its a strange coincidence.
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