Fuel Pump "Calibration"? - BMW F800 Riders Forum & Registry



Remove this advertisement by REGISTERING.

Results 1 to 6 of 6
  1. #1
    Points: 8,345, Level: 63

    Real Name
    David Bucher
    Location
    Lititz, PA USA
    Joined
    Mar 2012
    Online
    09-30-20
    Posts
    50 / 0 / 0 / 14
    Motorcycle
    '09 F 800 ST
    After fitting a new aftermarket fuel pump on my 2009 ST, the gas gauge and the computer info indicators of remaining miles to empty, useage, etc. don't seem to be functioning properly. Bike runs fine. I'm sure that I installed the pump assembly properly and that the fuel level float arm was free. However the Haynes manual notes that "If a new fuel pump is fitted the machine must be taken to a BMW dealer so that the engine management adaption values can be reset to recognise the new pump." Before I pull the pump to double check my installation, can someone explain exactly what that Haynes advice means? And, is a trip to the dealer really necessary?

  2. Remove Advertisements
    F800Riders.org
    Advertisements
     

  3. #2
    Points: 11,973, Level: 75

    Location
    Ontario, Canada
    Joined
    Jan 2007
    Online
    Posts
    307 / 0 / 0 / 7
    That advice anticipates that the replacement fuel pump creates a different amount of fuel pressure than the old one so the engine management system should reset its adaptations to "learn" the new parameters. A GS-911 or the Motoscan app can so instruct the ECU in lieu of the dealer.

    That being said your problem sounds more like an issue with the fuel level float mechanism.

    Sent from my SM-T813 using Tapatalk

  4. #3
    Points: 12,914, Level: 78

    Real Name
    Claudio
    Location
    Winnipeg, MB, Canada.
    Joined
    Dec 2006
    Online
    5 Days Ago
    Posts
    253 / 0 / 0 / 2
    Motorcycle
    '19 F800 GT
    Motorcycle
    '10 F800GS
    Quote Originally Posted by LititzDB View Post
    After fitting a new aftermarket fuel pump on my 2009 ST, the gas gauge and the computer info indicators of remaining miles to empty

    BMWRoadster is correct. The pump would not have an effect on your gas gauge or the statistics. Most likely the float maybe being interfered with or the electrical contact relating to the float has been affected inadvertently during the install. Definitely pull the pump out and check your installation.
    Claudio
    -------------
    BMW MOA Member, 2019 F800GT, 2010 F650GS twin 

  5. Remove Advertisements
    F800Riders.org
    Advertisements
     

  6. #4
    Ware, Herts, UK Pat H is offline F800Riders.org Supporter
    Pat H's Avatar
    Points: 145,677, Level: 100

    Real Name
    Pat
    Location
    Ware, Herts, UK
    Joined
    Aug 2006
    Online
    15 Hours Ago
    Posts
    11,208 / 0 / 160 / 1332
    Motorcycle
    '06 F800S
    When you have it pulled out check the fuel gauge reading while manually moving the float up and down.
    Flame red F800s as of Nov 2006. Watch for me around North London.


    Don't miss the F800 Garage Door Opener Video: http://www.youtube.com/watch?v=1C-Bxifv2Pk 

  7. #5
    ccramerusc's Avatar
    Points: 8,822, Level: 65

    Real Name
    Cramer
    Location
    Milwaukee, WI
    Joined
    Jun 2013
    Online
    7 Hours Ago
    Posts
    738 / 0 / 0 / 6
    Motorcycle
    '08 F800ST
    Mine gauge stopped working many years ago and it turned out being one of the wires getting caught on the float pivot point. I bent them out to the side, put the whole unit back in the tank, and it's worked perfectly since.

    Hopefully it's that simple for you.

    Sent from my SAMSUNG-SM-G891A using Tapatalk
    08' F800ST- side panniers & Shad SH45 top case, Russell Day Long seat, MRA Vario Windscreen, SW Motech crash bars, ZTechnik exhaust, PC-8 fuseblock, Stebel Nautilus horn, Throttlemeister throttle lock, SW Motech handlebar risers, LED fog lights, highway pegs 

  8. #6
    Points: 8,345, Level: 63

    Real Name
    David Bucher
    Location
    Lititz, PA USA
    Joined
    Mar 2012
    Online
    09-30-20
    Posts
    50 / 0 / 0 / 14
    Motorcycle
    '09 F 800 ST
    I removed the pump assembly and bent the arm slightly away from the direction of the adjoining tank wall. After replacing it, everything seems to be working as it should. That float arm wire is really hard. Can't see how it might have got bent when I was refitting the pump assembly. My best guest is that in trying to manipulate the pump assembly through 9 dimensions while struggling to properly seat it with that God-awful gasket, it got hung up somewhere it shouldn't have been and was simply stuck on full. Glad you talked me into pulling the pump again before I went running to the dealer.

  9. Likes ccramerusc, Claudio_S liked this post

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •