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  1. #1

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    No Fuel Filter.... Problems... Engine miss Fireing, Stalling....ect

    These Waverunners have no fuel filter except a fuel sock.
    Not having a fuel filter will lead to a lot of problems like...


    • Starting issues
    • Poor idle
    • Poor Performance
    • Engine does not reach full RPM
    • Increased fuel consumption
    • Rough engine performance
    • Surging and bucking under various throttle loads
    • Smoke from the tail pipe
    • Engine Knock or Detonation which can lead to catastrophic engine failure
    • Pollution
    . Stalling issues
    . Clogged injectors

    If I can make a suggestion, it would be put a filter type like a K&N filter RF-1100
    for about 12.00. Would be a good investment in any ski that does not have one.
    Last edited by cjk6119; 02-14-2019 at 01:05 PM.


  2. #2
    WTF

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  4. #3

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    Quote Originally Posted by seabrook View Post
    WTF
    Do you care to further elaborate on this topic?

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  6. #4
    Formerly Ultra250 TN Aquaholic6801's Avatar
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    Guess you know better then all the Yamaha, Kawasaki and Seadoo Engineers that design these things. Weird flex, but OK.

  7. #5
    WaterDR's Avatar
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    No filter needed. Just a separator.

  8. #6

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    Quote Originally Posted by WaterDR View Post
    No filter needed. Just a separator.
    As per the Yamaha`s Manual, it is not a true water separator, it is
    is a
    water separator to retains any water entering through the fuel tank breather hose if the watercraft is capsized as written in the manual.

    so it is not a fuel separator that is inline with the injectors as you would think.
    It is more like a one way vent if the ski was to roll over nothing more.
    Look at the manual and see for yourself page 61 3-10 under water separator and bilge pump.

    Futher, why not have a fuel filter the injector orifices are only the diameter of 40–500 μm range.

    Take care
    CJ
    Last edited by cjk6119; 02-14-2019 at 10:58 AM.

  9. #7
    WaterDR's Avatar
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    Problem with a fuel filter is they....well....filter. You get a pressure drop and especially a bigger one when plugged. I am sure if Yamaha thought one was needed, it would have one. But don’t think life will be turnips and roses if you put one on.

  10. #8
    TimeBandit's Avatar
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    Quote Originally Posted by cjk6119 View Post
    ......
    Futher, why not have a fuel filter the injector orifices are only the diameter of 40–500 μm range.
    CJ
    There is indeed a fuel filtering component on the inlet of the fuel pump assembly. Unless you have personally pulled the fuel pump unit out of the fuel tank, held it in your lap and took a real good look at the very bottom section, you'd miss a small dime-size filter material built into the body. It's not a screen, looks more like a white micron filter (and no, I don't know what micron size it is rated for). It's not a "consumable" or replaceable part (that I know of), so you won't find it singled-out on the parts fiche, alas it is there! I had a spare fuel pump on my self - yet recently sold it, otherwise I'd have taken a photo of it. If anyone else has one in-hand, look where I described and post a pic please.

    That all said, if you want to install an after-market in-line filter, go ahead . . . but it's not going to ever "catch" anything as long as the oem pump intake has that intake filter in-place.

  11. #9

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    And that's what I said in my opening statement is CJK6119"These Waverunners have no fuel filter except a fuel sock."
    But if your statement is true and I Quote
    TimeBandit " but it's not going to ever "catch" anything as long as the oem pump intake has that intake filter in-place. "
    T
    Then answer me this ... then why do cars have a fuel sock on them in the fuel tank attached to the fuel pump and a fuel filter inline with the injectors? I know of no car or truck that does not have one, even the engines that Yamaha co-developed with other engine manufactures have them installed on them.
    A sock filter can not filter down below 40 micron with a flow of 340 LPH, that why you need inline fuel filter that can filter to below 40 microns.
    Last edited by cjk6119; 02-15-2019 at 06:17 AM.

  12. #10
    TimeBandit's Avatar
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    The filter I am referring too is not a fuel sock.
    Found a pic.... reference the arrow pointing...
    Click image for larger version. 

Name:	wr_fp01.jpg 
Views:	106 
Size:	195.8 KB 
ID:	444825
    Ask Yamaha engineers what the micron rating is on this component before assuming the FIs are at risk.
    This design has been in the wild for a very long run, yet being known for 'clogged FIs' isn't even on the radar for the list of issues Yamahas are known for - so that little filter must be doing a decent job.

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