External, Inline Fuel Filter

Discussion in 'Parallel Universe' started by Full Power, Oct 4, 2013.

  1. Full Power

    Full Power Long timer

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    There was a very long thread, in which a RTW traveller, deep in the bush, frequently fueling his F800 from roadside vendors selling petrol in 2 liter ex-beverage containers finally suffered from fuel pump failure AND co-incident fuel filter blockage..
    Fuel pumps are now cheap, readily sourced, and easy to carry as spare.
    .... My question is:
    What is the preferred and easily found, one piece, metal canister inline fuel filter, with 6mm or 1/4 inch hose barbs, rated 50 PSI + and 5 microns absolute , suitable for the BMW fuel injection use ?
    .
    My intent is to replace, and remount the filter canister OUTSIDE the fuel tank, in the unused space just behind the fuel injectors.
    .
    #1
  2. GoneAgain

    GoneAgain Huh?

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    thats my 'intent' too.......... :deal


    .
    #2
  3. Loutre

    Loutre Cosmopolitan Adv

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    This should be very interesting! I'm in!:lurk
    Oh and could the next guy who does it make a "step by step" photo journal? pretty pretty please!
    #3
  4. JRWooden

    JRWooden Long timer

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  5. Full Power

    Full Power Long timer

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    Yes, read through MANY pages of those threads.
    I have a spare Fuel pump, in stock from the HighFlow people.
    Got that part covered.
    Now I am looking to source a ( few ) one piece, metal case 5 micron inline fuel filter(s) , with 1/4 inch hose barbs.
    Similar to the MAHLE KL315.

    The following characteristics are NOT acceptable:
    glass or plastic case
    multiple piece design
    absolute micron filtration GREATER than 5 microns.
    thread adaptors to hose barb.
    oversize hose barb connections greater than 6mm.
    miniaturized case, smaller than stock F800 filter.
    .
    .
    Should be something out there on the market.
    #5
  6. dpm

    dpm Been here awhile

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    Not quite 5 micron, but look at WIX 33031 or equivalents.


    better option might be Mann WK43/8?
    #6
  7. Full Power

    Full Power Long timer

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    WIX 33031= CARQUEST 86031... only 4 bucks local.
    steel case, 1/4 hose barb, inline fuel filter.
    12 micron
    60 PSI burst.
    We are getting closer, likely work in a pinch, and cheap enough.
    Still searching for smaller micron rating.
    #7
  8. Camel ADV

    Camel ADV Long timer

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    Not sure of the micron rating but a filter from a 800/1000cc Can-Am ATVs should be close to what you're after.

    Cory
    #8
  9. Snowy

    Snowy Long timer

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    So with 60,000kms on the FGS I read this and went and pulled my fuel filter out and back flushed.

    Nothing. Not a drop of fuel would pass through it under gravity. Wiped the outlet clean and put lips to it and blew through.

    Oh dear.

    It took more than a dozen fill, shake, wipe and blow before the resistance to flow dropped. The amount of fine dirt that came out was staggering.

    It still runs the same. Meh.

    The prefilter was sitting in the bottom of the tank when i lifted the pump assembly high enough to see in. Not sure if I knocked it off or if it was already off. But it was completely clean.

    Strange design. Can't figure why you'd build one like this.

    So we're positive that a replacement filter isn't available?
    #9
  10. GoneAgain

    GoneAgain Huh?

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    so why no plastic case..? i havent started looking yet.. (and prob wont till christmas..) but i was thinking a clear plastic one so i could see when it needed changing.. you concerned it wont handle the presure?


    .
    #10
  11. Full Power

    Full Power Long timer

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    Prefer a metal canister for durability.
    Nice if it is rated for fuel injection type pressures as well.
    ( What is our fuel line pressure typically ??)
    #11
  12. GoneAgain

    GoneAgain Huh?

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    no idea... BUT

    when mine was playing up, on the computer (at dealer), it was showing around 2 bar when idling ok, and down to .1 bar when she was about to cut out...

    2 bar is about 30 PSI... not sure how much hihgher (if any?) she gets under load...

    .
    #12
  13. Snowy

    Snowy Long timer

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    I used a piece of old towel when blowing the filter out. The terry towelling was catching and hiding most of the crap. The toilet paper on the left had one flush blown on it.

    This is only the results of about half the flushing.

    [​IMG]
    #13
  14. FredRydr

    FredRydr Danger: Keep Back 500 Ft.

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    Try not to introduce vapor lock that in-tank pumps and filters eliminated.

    Fred
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  15. JRWooden

    JRWooden Long timer

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    Rev 4 of the service manual lists the specs for the pump as:

    3.5 bar and 60 liter/hour
    #15
  16. JRWooden

    JRWooden Long timer

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    Hmmmmmmmmmm I'd not thought of that factor ...
    I wonder how much extra risk having an external filter presents in terms of vapor lock?

    Maybe the the smaller profile unit tucked under the seat would be better than a large can strapped to the frame? :wink:
    #16
  17. LukasM

    LukasM Long timer

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    Keep it away from the exhaust system, and vapour lock won't be a problem. Somewhere under the seat should work just fine.
    #17
  18. Bayner

    Bayner Long timer

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    Did it seem to clean out ok Snowy, you were able to blow through it when you finished flushing it?
    #18
  19. GoneAgain

    GoneAgain Huh?

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    ok, so i've answered my own question...

    done a 'little' research, and from all the technichal detail ive read from filter manufacturers, it seems..

    "EFI fuel filters are always housed in metal canisters"...

    and..

    "Never use Nylon-bodied filters on EFI systems as they will fail and may cause fire"....

    #19
  20. Snowy

    Snowy Long timer

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    Yeah, but there is still a fair resistance to flow. It is a fine filter, so I expect some, but initially I was seriously worried by how hard it was to blow through.

    Rang the BMW dealer today, and the fuel pump is a separate item, as is the sender unit, as is the pre filter (strainer). But the filter is only available as part of a $902 assembly, according to the parts guy. There is no separate part number.

    Si I'm looking at a smaller car unit tomorrow. I already have a great CAV screw on FI filter with water separator, but it's huge. So I'm hunting for something smaller.

    I was looking at it this morning and thinking I can cut an alloy plate that covers the hole in the top of the tank, and weld an alloy fuel pipe in that reaches the bottom of the tank. Then mount an external pump and filter on the top of that lid. Do away with the existing unit, and figure out how to mount the fuel level sender.

    To my way of thinking, having it made from a readily available aftermarket pump and filter would be the simplest most robust design looking at failures in the future.

    The other option is to just put a screwdriver through the existing filter element internally, and just fit a small in line external filter. I'll have a better idea tomorrow.

    I got sidetracked today with tyre fitment and some MRI time for the busted back. Tomorrow I'll focus.
    #20