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  1. #1

    Question SL650 fuel delivery problems!!!!!

    I have a 94 Polaris sl650. It has sat for about a year. It had a lot of oil in the crank case. I pulled the plugs and the vacume hose off of the case. I turned over the motor and blew out all the oil (took several days I didn't want to burn up the starter). I hooked up the vacume hose and turned it over and it's not sucking fuel. I pulled the fuel supply line from the petcock and sucked on it, there were no leaks and the fuel flowed easily. So I thought the fuel pump was bad, I purchased a used 3 output fuel pump hooked it up and it did the same thing! It moves the fuel just a bit but not enough to suck it into the cards. What is wrong?!?!?!

    Thanks for all your info!!!

    Kory


  2. #2
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Did you try priming the carbs with a little premix first?

    It takes a while for the fuel pump to filll the hose, water seperator, and finally to the pump.

    Also check your filters and petcock for restriction.

    And do you still have the autocock installed? If so, remove it and cap the fitting air-tight.

  3. #3
    I sucked the fuel enough that it filled the water seperator, and some of the hose to the pump, after a lot of cranking it kind of filled the fuel hoses and eventually into the first carb but couldnt get it to fill the second two carbs. I will try bypassing the petcock to eliminate one problem.

    What is an autocock and where is it located?

    Thanks for all the info!
    Kory

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    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Here's a pic of the autocock.



    Normally found just in front of the fuel pump.

  5. #5
    I do not have an autocock on the ski.

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    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    What's your compression on the PTO (back) cyl?

    Poor compression will yield a poor pulse to the fuel pump.

    Also test the used fuel pump with a vacuum pump.

    It should hold 5 psi indefinately.

  7. #7
    all 3 cyls are 100 psi. That seemed low all the 780's I've had were 120 but since it was consistent I wasn't that worried about it. Is that normal for the 650's?

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    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    That's a bit low.

    They too should be in the 120-130 psi range.

  9. #9
    Thats what I was afraid you would tell me. Its not normal that all 3 cyls would be low at the exact same psi is it?

  10. #10
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Most likely the gauge just reads low. As long as the cyls are consistant, you'll be fine with 100 psi. (it'll still run good, just not as "snappy" than 120 psi)


    Is there any oil or fuel left in the pulse hose? It may be blocking the signal to the pump.

    Try by-passing the petcock and water seperator. If that doesn't change anything, re-install them.

    Then try unscrewing the gas cap and see if that helps.

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