what Vacuum line is this?

M Body General Discussion

  1. IndieDippy

    IndieDippy Well-Known Member

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    been figuring out whats wrong with my fury. several Vaccum lines have been plugged with screws causing a blevvy of leaks thus the clicking noise and stall. one last one needs to be fixed. this one at the rear of the carb is plugged with a big screw and cut.

    IMG_20200626_114127094.jpg

    IMG_20200626_114200464.jpg

    IMG_20200626_114131793.jpg
     
  2. Mikes5thAve

    Mikes5thAve Well-Known Member

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    The big ones go to PCV valve and the charcoal canister. Some years also brake booster, some years brake booster comes off intake manifold.
    Check the vacuum hose sticker under the hood.
    If the carb isn't original it could be one that isn't needed.
     
  3. Aspen500

    Aspen500 Well-Known Member

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    Coming from the base of the carb and the size, it should go to the PCV valve.
     
  4. IndieDippy

    IndieDippy Well-Known Member

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    its an original lean burn equipped car. not sure why this line was cut. can someone point me to the location of where this hose leads to? also what size is this hose? thanks
     
  5. IndieDippy

    IndieDippy Well-Known Member

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    one big line goes to the PCV valve. can't figure out where this plugged one goes. as far as i can tell this car has a factory carb. car has been shaking a lot lately. really at a loss as to what is wrong here.

    IMG_20200701_130433891.jpg

    IMG_20200701_130324919.jpg

    this plugged line is located to the left side of the car. one to the right is hooked up to the PCV valve
     
  6. M_Body_Coupe

    M_Body_Coupe Well-Known Member

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    Well what I see right there in that last pic is a BIG GAPING vac leak. See the 'T' in that line?

    So that channels the manifold vacum to your choke pull-off (which is that puck-like pot the run lines to) and usually is also connected to something else that need vac signal. But in your picture it looks like tha end of that 'T' is wide open...so when the car is running you should in fact feel air getting sucked in-there.

    Do you know whether that is a Holley 1945 carb?

    My '80 FSM 'Engine Performance Manual' book shows the complete carb hookup here...I'll scan and upload the first couple of pics, that should help I think.
     
  7. M_Body_Coupe

    M_Body_Coupe Well-Known Member

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    OK, here is the scan...

    AUTO - Carb_Scan.jpg
     
  8. Mikes5thAve

    Mikes5thAve Well-Known Member

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    If it's stock it should either be a Carter BBD or a holley 6280. I don't think it's a BBD with that solenoid sticking out the side.

    Like I said in earlier post there should be a sticker under the hood that shows where all the vacuum hoses go. It's either on the hood or the top of the fire wall by the vent. ANy nipple that doesnt' have a hose shown should be blocked off.
     
  9. IndieDippy

    IndieDippy Well-Known Member

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    the T you see open came off when i took the air cleaner off. I've put it back together. i'm mainly focused on the hose with the screw in it. by looking at your scan maybe this is the crank case hose? kinda hard to tell. this hose is located under the choke diaphragm. has two hoses at the rear one which goes to the pcv but this one located to the left side of the car is plugged with a screw. i'll look at the underside of the hood and see what it says. car is a 1988 fury if that helps
     
    Last edited: Jul 1, 2020 at 9:28 PM
  10. IndieDippy

    IndieDippy Well-Known Member

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    here are the lines. looks like maybe that one actually goes to nothing

    IMG_20200701_223957472.jpg
     
  11. Aspen500

    Aspen500 Well-Known Member

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    I see there's another port that goes to the PCV valve. It is entirely possible, if this isn't the original carb, that port is unused and needs to be plugged. I'd get an actual vacuum plug instead of a bolt shoved in a hose though.
     
    Last edited: Jul 2, 2020 at 1:04 PM
  12. IndieDippy

    IndieDippy Well-Known Member

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    think all i need to do is replace some hoses. one that goes to that T is also a bit tough and cracked. i'll see if i can get an actual plug
     
  13. IndieDippy

    IndieDippy Well-Known Member

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    upload_2020-7-2_15-39-49.png
    this part was also previously plugged. i've put it back together now though