Fuel gages

Discussion in 'Sport Cruisers' started by Bob 32, Aug 3, 2022.

  1. Bob 32

    Bob 32 New Member

    Jun 18, 2022
    32 Sundancer
    Mercruiser 6.2
    I just purchased this 32 Sundancer 2005 and the fuel gages are all over the place. I fill the tank and the next day both gages read around half. After about 10 minutes the make there way to full? Should I change both senders?
  2. sbw1

    sbw1 Well-Known Member

    Oct 10, 2006
    West Michigan
    This is listed in my signature
    This is listed in my signature
    Learn how much fuel you burn per hour and forget the gauges.
  3. unsalted

    unsalted Active Member

    Jan 21, 2022
    Grand Haven, MI
    2001 Sundancer 310
    Twin MX 6.2L MPI w/Bravo III Drives
    I have a Garmin MFD and pull engine data in via FoxGateway (2001 MX 6.2 MPI pre-SmartCraft) and it will track fuel consumption via engine fuel flow inputs. I find this very accurate and rely on it. I have a Generator, but we haven’t used it much so far, and would need to manually account for its burn if we do.
  4. scoflaw

    scoflaw Well-Known Member

    Aug 10, 2011
    cape cod mass, cape coral fl
    1999 Powerquest legend 260 sx 502 mag
    2005 Baja 242 islander 496
    502 mpi Bravo 1
    496 mag B1
    I'd start with the senders. Ground your sender wire and see if your gauge pegs full. You can dick around with the ground wire to see how responsive your gauge is.
  5. Scott S.

    Scott S. Member PLATINUM Sponsor

    Jun 15, 2009
    Tempe AZ.
    '05 340 DA
    '05 290 SLX
    '85 210 CC
    8.1 's IB's
    383's Bravo 1's
    7.4 430 HP Bravo 1
    My gauges are slow to respond after powering up. Not 10 minutes slow... your gauges and senders work. Tanks full, reads full !
  6. Phil S

    Phil S Well-Known Member

    Oct 16, 2020
    2004 300DA
    5.0 Merc MPI
    Bravo III

    2022 KL Tender
    6hp Mercury OB
    Same here -- mine start out empty and work up to full over a few minutes.

    The other day it freaked me out as I know the tanks are almost full
  7. Phil S

    Phil S Well-Known Member

    Oct 16, 2020
    2004 300DA
    5.0 Merc MPI
    Bravo III

    2022 KL Tender
    6hp Mercury OB
    [​IMG][​IMG][​IMG][​IMG][​IMG][​IMG] upload_2022-8-4_14-57-26.png
  8. Adriana Rae

    Adriana Rae New Member

    Jun 24, 2022
    Boynton Beach,Fl
    340 Amberjack 2002
    8.1 mercruiser
    Had a similar issue after making sure the gauge was working correctly and the wires were cleaned and secure I bit the bullet and replaced the sending unit
    Problem solved
    KrazyKarl likes this.
  9. alnav

    alnav Well-Known Member

    Sep 16, 2009
    West River, MD
    40 MY
    QSB 425
    Do you have the typical OEM senders with a float arm?
    I would look at changing them out for a level sensor as long as your tanks will accept a sensor that will need to be unobstructed from top to bottom. Based on a recommendation in another thread, I recently installed KUS sensors and have been very happy with them so far. They don't much more and were extremely easy to install, at least in my case.

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