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  1. K

    Problem with vacuum

    2003 90 HP 4 stroke OB Mercury. Motor runs fine on earmuffs with vacuum line disconnected at T near a check valve. Once I hook this back up, it's very hard to start, idles rough and I get gas in my crank. Any help with this please?
  2. K

    Check Valve on vacuum line? A sort of PCV Valve? What's it do?

    2003 Mercury 90 HP OB 4 stroke. Had a issue with starting......it would turned over but had hard time starting. Checked some vacuum lines and mistakenly pulled one out that goes behind the carbs (really hard to get to). On this vacuum line there's a kind of check valve where you can blow through...
  3. K

    Wiring harness diagram?

    2003 Mercury 90 HP, 4 stroke Serial # 0T785839 Model 90ELPT 4S. I'm looking for a diagram showing what each pin powers on my wiring harness.. It's a 8 pin connector
  4. K

    Can a bad rectifier cause throttle load problems?

    2003 90 HP Mercury OB. Can a bad rectifier cause a motor to bog, sputter at mid to higher throttle?
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