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johnson 1991 v4 90hp wont start

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  • johnson 1991 v4 90hp wont start

    hello my v4 90hp wont start without primer solenoid on after its starts i turn primer back to normal it will idle for 10 mins then die if i pump the fuel line it helps so im thinking fuel pump iv cleaned carbs replaced thermos anyone have a good thought about it need some input thx


  • #2
    Re: johnson 1991 v4 90hp wont start

    The topic header says it won't start, yet you indicate it will run. Not sure just what you mean regarding the primer solenoid. You don't "turn it back to normal" during regular operations. To prime the engine for cold start, you push in on the key when it is in the on, or start position. That will inject a small amount of extra fuel direct into the carb throats. That's the choke operation. There is a red lever on the side of the solenoid, which is not to be moved during normal operations. That red lever should always be kept parallel to the length of that solenoid. You are performing a good test of the fuel system by constantly priming the hose bulb. That action forces extra fuel into the carb bowls. If the engne runs "normally" as long as you prime that hose bulb, you've got a fuel delivery issue. Very well could be a weak fuel pump. (Or fuel restriction-like a bad hose, sticking anti-siphon valve, etc.) The issue with a weak pump is that it may provide some fuel to run the engine, but maybe not enough to sustain it-this usually is a high speed WOT problem, but surely could occur at idle if the pump is weak enough.

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    • #3
      Re: johnson 1991 v4 90hp wont start

      Do you have an external filter? Did you check screen on Pump?
      Second EMD on red leaver...leave it alone...unless your trying to pull start or mist it.
      It's a possibility!
      Love my '93 88spl Johnson and '93 Larson bow rider

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      • #4
        Re: johnson 1991 v4 90hp wont start

        ok will not touch red lever and ill check my filters the key primer makes a sound when pushed in but doesnt help

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        • #5
          Re: johnson 1991 v4 90hp wont start

          Originally posted by arthurj12 View Post
          hello my v4 90hp wont start without primer solenoid on after its starts i turn primer back to normal it will idle for 10 mins then die if i pump the fuel line it helps so im thinking fuel pump iv cleaned carbs replaced thermos anyone have a good thought about it need some input thx
          I understand what you're saying about turning the RED lever of the primer solenoid to the manual override position, then turning it back to the normal automatic position, also also the priming the fuel primer bulb statement.

          What you've had to say indicates that the fuel pump is failing OR the pressure line that leads from the pump to the crankcase is cracked, broke, leaking.

          The proper and normal starting procedure for that engine incorporating the Fast Start feature and the fuel primer solenoid is to..... Pump the fuel primer bulb up hard, turn the key to the START position and push the key in at the same time to engage the primer solenoid, and hold the key in until the engine fires and starts, then release the key to the ON position.

          It may be necessary to bump/push the key in momentarily from time to time to keep a cold engine running until it warms up.
          Our Questions Require Answers... If You Refuse To Answer Our Questions... How Can We Answer Yours?

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          • #6
            Re: johnson 1991 v4 90hp wont start

            Did you clean the carbs before or after it wouldnt start and run?

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            • #7
              Re: johnson 1991 v4 90hp wont start

              ok thx alot ill check the pressure line is there rebuild kits for the vro2 pumps available if need be

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