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Thread: Help Msx 150

  1. #1

    Help Msx 150

    I have a 04 msx 150 in my shop it starts and then stalls it will run with 1 injector unpluged. Check engin light is on and I don't have the soft ware or harness to check.


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    Moderator beerdart's Avatar
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    ph2ocraft's Avatar
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    riptide, check you fuel pressure.

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    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by ph2ocraft View Post
    riptide, check you fuel pressure.
    Bernie gave me this tip for Fitch injectoed motors, not sure if it applies to Bosch injection systems;

    Hold the fuel line from the fuel pump in your hand, then try to start the motor.
    If you feel the hose pressurize, the fuel pump is probably OK, as fuel pump failure usually means NO pressure, not partial pressure.

    If no pressure, check for electrical power to the pump.

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    ph2ocraft's Avatar
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    Weak or low pressure will and does create a poor running condition.
    Poor or hard starts
    Hestitation upon acceleration
    Boggish feel at full throttle or higher RPM's

    Most of these conditions can be directly related to a weak fuel pump.
    I've replaced dozens of fuel pumps for those various reasons on both the Ficht and Bosch systems.
    I asked a customer a dozen times if his boat had the correct fuel pressure and he kept telling me "yes, the system has pressure". I finally asked how he measured the pressure. His response was "I can hear the pump run"
    Guess what his hesitation was??
    It takes minutes to make sure you have the correct operating pressure.

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    Bernie's Avatar
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    Keith, Different system ,works on higher pressure and the injectors function a little different

    Cheers

    Bernie

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    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by Bernie View Post
    Keith, Different system ,works on higher pressure and the injectors function a little different
    Cheers
    Bernie
    Quote Originally Posted by ph2ocraft View Post
    Weak or low pressure will and does create a poor running condition.
    Poor or hard starts
    Hestitation upon acceleration
    Boggish feel at full throttle or higher RPM's

    Most of these conditions can be directly related to a weak fuel pump.
    I've replaced dozens of fuel pumps for those various reasons on both the Ficht and Bosch systems.
    I asked a customer a dozen times if his boat had the correct fuel pressure and he kept telling me "yes, the system has pressure". I finally asked how he measured the pressure. His response was "I can hear the pump run"
    Guess what his hesitation was??
    It takes minutes to make sure you have the correct operating pressure.
    I just keep on learning!

    Can you use a standard tire pressure gauge on the schrader fuel line pressure valve, or do you need to use a meant-for-use-with-fuel gauge?

  8. #8
    Don't you love being watched?? milesengineer's Avatar
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    No, you can not use a tire pressure gauge.

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    Bernie's Avatar
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    Well I have used a car tyre pressure gauge .How ever when you want to use it again it is no good .so for a one off throw away item I did .not recommended safety wise but...

    Bernie

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    2&4strokepolaristech's Avatar
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    msx problems

    we need more information than that. the pressure regulator is in the rail in that boat like a car(the correct way to do it!) i would start with the basics. compression/spark/fuel. you should ahve about 125-145 psi in the cylinders. you can use a noid light to check for a signal at the connector for fuel injectors. how are the spark plugs? you do not need the software. i only use it about 10% of the time and mainly use it to clear codes. oh and a quick chck to see if you have fuel while cranking is to pull the front line off and crank it over with the lanyard in and put line in a container(then you can look at fuel condition as well) how many hrs on this boat? has it ever had a fuel filter? i could go on and on but lets see what you have done!!!

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