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  1. #1

    Return line restrictor 93 sl 750

    I've been reading in previous treads about a return fuel line restrictor. I don't believe my ski has one. Is this correct?


  2. #2
    Lake Mead Bum & BTLS Mark starflight's Avatar
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    The 93 diagram doesn't show one.



    94-95 diagram does....item #14


  3. #3
    Thanks, I looked at the same diagram and didn't notice one but wasn't sure.

  4. #4
    mr. happyfunbear tenjuna's Avatar
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    as I was told on my 93 650, it doesn't hurt to add one...in my case it actually helped.

    barbed line splicer, #90 jet (you may have to adjust this for your situation), and a $9 tap/die tool kit from Harbor Freight...15 minutes later I had it put in.

    there is a thread somewhere around here with instructions.

  5. #5
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by starflight View Post
    The 93 diagram doesn't show one.

    94-95 diagram does....item #14...
    The 1993 diagram may not show one, but did 1993 production actually use a fuel line restrictor?

    What about 1992?

    Sometimes these diagrams and parts listings are not completely accurate.

    I have never seen a definitive statement regarding these fuel line restrictors.

    Restrictor PN 5020773 is listed only for 1994-1995, 650 and 750 models

    Do we actually know for sure which models in which years really did have a separate restrictor positioned inside the return fuel line, and which years and models had the restrictor orifice tucked inside the carb itself?

    Did Polaris issue any Service Bulletins or Tech Tips that retrofitted the restrictor into the earlier years?

    Or were the 1992-1993 carbs simply tuned for lower fuel pressures than 1994-1995?

    1992-1995 fuel system related Service Bulletins

    PWC-92-04 SL 650 Carburetion Setup and Adjustments

    PWC-93-02 1992 SL650 Fuel Tank Drop Tube Retaining Cap

    PWC-93-03 1992 SL650 Update Kit PN 2200475

    PWC-93-07
    1. All 1992 and 1993 SL650 and SL750 Fuel Tank Drop Tube Retaining Cap
    2. Fuel Tank Drop Tube Lines and Clamps

    PWC-93-08
    3. Inspection of Oil System, Fuel System Vent Lines and Check Valves

    PWC-94-01
    1. Spark Plug Caps Improperly Installed on the Coil High Tension Leads
    2. Insufficient Torque on Cylinder Head Nuts
    3. Spark Plug Type Listed Incorrectly in Owner's Manual

    PWC-94-09 All 1994 SL650, SL750 & SLT, Fuel Tank Drop Tube Retaining Cap

    PWC-94-13 1994 SLT Fuel Tank Vent Relocation

    PWC-95-02 1994 SLT - Fuel Tank Vent System Update

    PWC-95-03 All 1994 Models - Failure Of Vacuum Controlled Fuel Valve

    PWC-95-05 All 1995 Models - Cracked Or Broken Stems On Fuel Tank Pick-up/Sender Unit

    PWC-95-07 All 1995 Models - Kinked Fuel Lines

    PWC-95-08 1995 SL650/750 - Incorrect Fuel Line Routing

    PWC-95-14 1995 SL650/SL650 STD - Piston Damage Or Lean Condition At High Throttle Settings

    PWC-95-18 All 1992-1995 Model Watercraft - Fuel Valve Restriction May Cause Lean Condition

    PWC-95-19 1994 - 1995 SLT 750 - Fuel Cap Cracking

  6. #6
    mr. happyfunbear tenjuna's Avatar
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    from my memory of the conversation at Utica, it was thought that there might be a restrictor built into the last (pto) carb, but in any case on my ski the fuel pressure was pretty low (1-2 psi), and it was suggested that I add one anyway.

    I am upwards of 4-5 psi now, so I am not worried at all about fuel delivery.

  7. #7
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by tenjuna View Post
    from my memory of the conversation at Utica, it was thought that there might be a restrictor built into the last (pto) carb, but in any case on my ski the fuel pressure was pretty low (1-2 psi), and it was suggested that I add one anyway.

    I am upwards of 4-5 psi now, so I am not worried at all about fuel delivery.
    Before the inline restrictor was added, where was your fuel pressure being measured?

    If there is indeed a restrictor inside your last carb, then the only places you can measure accurate fuel pressure would the return fuel lines between carbs, before that last carb.

    Or on the fuel pump supply side lines, which might not give the same measurements...

    Thinking back to Starved Rock, I think you said there was a difference in the pressure/resistance you felt when pumping the primer bulb, after the inline restrictor was installed. That would imply there isn't an internal restrictor in your carbs.

    Do you know whether your carbs are original 1993 spec?

    Just trying to find some confirmation about these restrictors. What years/models they were stock, whether they can be retrofitted to earlier years with positive results...

  8. #8
    mr. happyfunbear tenjuna's Avatar
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    understood...I don't think there is a lot of knowledge on the 1992 and 1993 models, they seem to be a different beast than 94+.

    in fact, there was comments both ways on whether there was a restrictor or not, so I don't know that I can say which is correct. the fuel pressure was tested after the last carb, so that would have made the test invalid if there was a restrictor. I have the carbs pulled right now so if someone could point me in the right direction, maybe we could make that determination once and for all? to my knowledge these are the original model 1993 carbs.

    I went with the flow at the time and added a restrictor since 1. it was low pressure as tested and 2. it "doesn't hurt to add one" and 3. I had all the parts with me.

    in any case I had much better pressure at the bulb after adding it, so I think I made the right choice.

  9. #9
    Lake Mead Bum & BTLS Mark starflight's Avatar
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    My memory is fuzzy at times, but...

    I believe I've seen a thread on here a good while ago about this subject. I remember someone asking about the location of the restrictor, and someone else stated that each one of the carbs had its own restrictor for 92 & 93. That person (I can't remember whom) also posted pictures of the inside of the inlet plates showing the individual orifaces.

  10. #10
    mr. happyfunbear tenjuna's Avatar
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    I have seen/heard that as well, but I could not find it...I don't think they were helping much in any case.

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