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  1. #1
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    Mercury 3 Liter EFI, ECU, and bleed lines

    I noticed the service manual for Merc 3-liters (1994-1998) has different routing for the bleed lines depending on what ECU it has. I've read somewhere that it is important to match the routing to the ECU, but how can this be? Why would a different year of ECU care about how the bleed lines are routed? Doesn't make sense to me

    Let's say for arguments sake that I'm right and it doesn't matter if you match the wrong bleed line routing for a given year of ECU... is there a particular bleed line routing that will work better for the engine?

  2. #2
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    Anyone? Surely someone here must know about the Mercury 3 liter?

  3. #3
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    Look at it as playing the lottery. As in , pick six . There was no way of telling what the next year .. or better yet , what the next run of serial number ... bleed hose routing was gonna be .
    Not that it meant much .. They finally got it right (at least on paper) for the 2005 EFI / 300x , by following , or better yet leading the firing order , so intake signal vacuum swept the puddled fuel (if there was any) from the trough in the reed cage area..
    I have blocked them off , and tried just about every conceivable combination , no magik wand there ..

    If you insist on iney-meanie-miny-mo the lines .. Buy a roll of H-174 from the NAPA store ... and have fun .. <--- {raw fuel (-===

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  5. #4
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    Lol I probably won't try every combination out there, but I'll take your advice and use H-174

    I have to wonder though, how come they plugged up six of the access points on either side of the motor early on, then decided later to route bleed lines to those points (see attached pictures)?

    I get the basic principal behind what the bleed lines are doing, but I'm having trouble following what's flowing where exactly, especially in the cases with the additional 12 access sites
    Attached Thumbnails Attached Thumbnails Screen Shot 2021-02-24 at 10.14.16 AM.png   Screen Shot 2021-02-24 at 10.13.53 AM.png  

  6. #5
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    I think on some of them , they used the road map to Kenosha ..

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