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Thread: Fuel Filter Question

  1. #1

    Fuel Filter Question

    Having a coffee with a friend and I was outlining all the service work completed during this off-season, he posed a question about the Fuel Filter. I did a thread search looking for Fuel Filter, but couldn't find any mentions. Is there a fuel filter as part of the fuel pick-up/pump? Is there an in-line filter? What happens if I end up in a part of the world where the fuel quality is lower and the fuel has sediment in it? I imagine if there's no filter, dirty fuel would cause awful fuel system problems, clogged injectors, etc. Is the fuel filter replacable? Any part number references?

    Any insight would be appreciated. Thanks!

  2. #2
    Quote Originally Posted by marlen.padberg View Post
    Having a coffee with a friend and I was outlining all the service work completed during this off-season, he posed a question about the Fuel Filter. I did a thread search looking for Fuel Filter, but couldn't find any mentions. Is there a fuel filter as part of the fuel pick-up/pump? Is there an in-line filter? What happens if I end up in a part of the world where the fuel quality is lower and the fuel has sediment in it? I imagine if there's no filter, dirty fuel would cause awful fuel system problems, clogged injectors, etc. Is the fuel filter replacable? Any part number references?

    Any insight would be appreciated. Thanks!
    Model? Year?
    Paul Glaves - "Big Bend", Texas U.S.A
    "The greatest challenge to any thinker is stating the problem in a way that will allow a solution." - Bertrand Russell
    http://web.bigbend.net/~glaves/

  3. #3

    Fuel filter

    Mine is a 2010 RT. I presume all 10-14 RT and GS would be similar. Hex heads the same?

  4. #4
    Quote Originally Posted by marlen.padberg View Post
    Mine is a 2010 RT. I presume all 10-14 RT and GS would be similar. Hex heads the same?
    Sometime about the time of the demise of the Oilheads I lost track of the associations of models and their head style, albeit cam head, hex head, wet head, or dead head. And back in my day even among the Oilheads and the Airheads and the K bikes there were significant differences. An R1100RS and R1200C were both Oilheads but hugely different beasts. An R60/5 and R100RT were both Airheads but not the same at all in their details. And even a K1200 could be two totally different models, one with a horizontal flat four and one with a vertical slant four engine, identified only by year. This slightly snarky post is to say that broad categories like camhead or hexhead don't help with details.
    Paul Glaves - "Big Bend", Texas U.S.A
    "The greatest challenge to any thinker is stating the problem in a way that will allow a solution." - Bertrand Russell
    http://web.bigbend.net/~glaves/

  5. #5
    Registered User pappy35's Avatar
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    2005-2009: Hexheads
    2010-2013: Camheads (very, very similar to the Hexheads)
    2014-2018: Wetheads (Clean-sheet redesign)
    '13 R1200RT 90th Anniversary Edition

  6. #6
    Watch This!!! junkjohn's Avatar
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    Quote Originally Posted by marlen.padberg View Post
    Having a coffee with a friend and I was outlining all the service work completed during this off-season, he posed a question about the Fuel Filter. I did a thread search looking for Fuel Filter, but couldn't find any mentions. Is there a fuel filter as part of the fuel pick-up/pump? Is there an in-line filter? What happens if I end up in a part of the world where the fuel quality is lower and the fuel has sediment in it? I imagine if there's no filter, dirty fuel would cause awful fuel system problems, clogged injectors, etc. Is the fuel filter replacable? Any part number references?

    Any insight would be appreciated. Thanks!
    I think it uses a sock in the fuel tank. Try searching on max bmw site.
    John Simonds
    2017 R 1200 GS Adventure
    1975 Norton Commando 850 Roadster Mk 3
    If it ain't broke, fix it 'till it is.

  7. #7
    Quote Originally Posted by pappy35 View Post
    2005-2009: Hexheads
    2010-2013: Camheads (very, very similar to the Hexheads)
    2014-2018: Wetheads (Clean-sheet redesign)
    So, does his bike have an in-line fuel filter, a pump screen, or what?
    Paul Glaves - "Big Bend", Texas U.S.A
    "The greatest challenge to any thinker is stating the problem in a way that will allow a solution." - Bertrand Russell
    http://web.bigbend.net/~glaves/

  8. #8
    Watch This!!! junkjohn's Avatar
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    I think that is what he is trying to find out.
    John Simonds
    2017 R 1200 GS Adventure
    1975 Norton Commando 850 Roadster Mk 3
    If it ain't broke, fix it 'till it is.

  9. #9
    Registered User drneo66's Avatar
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    There are two lines of defense that I understand. There's a small screen "bag" on the bottom of the filter assembly. Plus there's a filter built into the pump assembly. BMW doesn't have any recommendations as to when to change either. It's not an easy thing to disassemble, but Mr. BestRest has a video. He also sells the screen bag.

    If I were going to go someplace with suspect gas, I'd probably install a filter at the nozzle, a la the BestRest products.
    Current: 2007 BMW R1200RT, 2013 F800GS
    Former: 1995 BMW K75S, 2009 BMW G650GS
    MOA Member #:150400, IBA#: 37558

  10. #10

    Fuel Filter

    Well thats an interesting approach. Would definitely give thought to that if going somewhere where you know the fuel quality is going to be questionable. Hadn't heard of guglatech before, but am suitably impressed by that video.

    Regarding my existing pump/filter assembly, is the filter replaceable, and has anyone replaced their filter? Is this something I should give thought to at 120,000kms, or keep going and only change it if its causing grief?

  11. #11
    not so retired henzilla's Avatar
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    There is only a sock at pump inlet on all models other than the metal tanked Roadster and the early Hexhead ST. I haven't seen any other filter even on the pump on the few I have sitting around from failed units
    Those do have an inline filter. Not a clue why they dropped the filter and not a lot of places to really mount one on other models...though one certainly could somewhere.
    The Roadsters is in the tunnel under tank, never looked at location on a ST

    Guess they figured gas never gets contaminants

    I don't worry about it and have two models with over 120K miles. Have had the add HEET once on mine when I had sputtering after fueling at a questionable but only game in town station. Have drained a lot of water from bikes sitting with half tank for some time...not mine, but two ruined the pump as well do to rusting on a GS and a K12S.
    Steve Henson-Mod Team and SABMWRA Prez

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  12. #12
    Debbie's Servant Lee's Avatar
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    Quote Originally Posted by henzilla View Post
    There is only a sock at pump inlet on all models other than the metal tanked Roadster and the early Hexhead ST. I haven't seen any other filter even on the pump on the few I have sitting around from failed units
    Those do have an inline filter. Not a clue why they dropped the filter and not a lot of places to really mount one on other models...though one certainly could somewhere.
    The Roadsters is in the tunnel under tank, never looked at location on a ST

    Guess they figured gas never gets contaminants

    I don't worry about it and have two models with over 120K miles. Have had the add HEET once on mine when I had sputtering after fueling at a questionable but only game in town station. Have drained a lot of water from bikes sitting with half tank for some time...not mine, but two ruined the pump as well do to rusting on a GS and a K12S.
    Most cars no longer have a fuel filter, just a screen on the fuel pump. Diesel vehicles still use a fuel filter.
    Maybe the filters on gas station pumps are better than they used to.
    Lee
    2016 R1200RS
    MOA # 30878
    Past BMW Bikes: 2011 K1300S, 2003 K1200RS, 1991 K75S, 1987 K75T, 1984 R100RT

  13. #13
    Registered User drneo66's Avatar
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    Quote Originally Posted by marlen.padberg View Post

    Regarding my existing pump/filter assembly, is the filter replaceable, and has anyone replaced their filter? Is this something I should give thought to at 120,000kms, or keep going and only change it if its causing grief?
    The sock? Sure! You could always pull the pump assembly and see... if it's dirty, then you could get further into the fuel system. (Mr. Injector did a nice job cleaning my fuel injectors on my K75 a while back).
    Current: 2007 BMW R1200RT, 2013 F800GS
    Former: 1995 BMW K75S, 2009 BMW G650GS
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  14. #14
    Registered User GTRider's Avatar
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    Quote Originally Posted by Lee View Post
    Most cars no longer have a fuel filter, just a screen on the fuel pump. Diesel vehicles still use a fuel filter.
    Maybe the filters on gas station pumps are better than they used to.
    And fuel pumps may be better or more tolerant than they used to be. And the gradual demise of the corrosion-prone metal underground fuel storage tank at gas stations may have contributed. Also in the mix could be the switch from Bernoulli-based carburetors and their obstruction-prone jets and passages, to pressurized FI systems.

    Diesels will always have filters, mainly because of water-in-fuel issues that can not only leave one stopped by the side of the road, but can be destructive as well. Google “Bosch CP-4 fuel pump” on any of the light-truck sites for that story.

    Best,
    DeVern
    DGerber
    1983 R80ST — 1984 R80 G/S-PD — 2004 K1200GT w/Hannigan S/C — 2010 K1300GT — 2018 R1200GS
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  15. #15
    Registered User lkraus's Avatar
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    Quote Originally Posted by marlen.padberg View Post
    Well thats an interesting approach. Would definitely give thought to that if going somewhere where you know the fuel quality is going to be questionable. Hadn't heard of guglatech before, but am suitably impressed by that video.

    Regarding my existing pump/filter assembly, is the filter replaceable, and has anyone replaced their filter? Is this something I should give thought to at 120,000kms, or keep going and only change it if its causing grief?
    Don't worry about it. It's not a scheduled maintenance item and you would probably need an inch or two of mud in your tank before it could clog.
    Larry
    2006 R1200RT

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