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    1996 mercruiser 4.3LX fuel pump question

    Do you have the correct wiring diagram for the oil pressure switch. As in which terminal the purple/yellow and purple wires are suppose to connect to? Maybe they were put on backwards?
  2. N

    1996 mercruiser 4.3LX fuel pump question

    Right. Thank you. I double checked. I have it wired correctly! So the oil pressure switch still needs to close when starting the engine correct? Since it won’t get fuel while trying to crank over, nor get fuel while running (after putting fuel in carb) it still leads me to believe that it is a...
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    1996 mercruiser 4.3LX fuel pump question

    I realized I just answered my own question. The purple wire that gives 12V while the key is ON feeds power to fuel pump only when the oil pressure builds up to certain pressure. Everything is indicating that I have a bad oil pressure switch In my opinion. Can anyone confirm my diagnosis?
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    1996 mercruiser 4.3LX fuel pump question

    Update: I jumped the oil pressure switch and the fuel pump turns on and fuel does pump into carb with the key in the ON position. What does this tell me?
  5. N

    1996 mercruiser 4.3LX fuel pump question

    Hello. I am in the process of diagnosing what could be wrong with my boat. I am not getting fuel to the carb. Things I have completed/diagnosed: -Bad starter. Replaced. Works flawless. - Replaced slave solenoid -checked for 12V from purple/yellow wire from starter solenoid while cranking...
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