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  1. #1

    Default Odd addition to the Vent line

    I've had my truck for about 6 months now. I started noticing a stronger and stronger smell of gas after about 15 minutes of operation. It didn't take me long to find the culprit. I had gas literally pouring out of the prefilter on my air cleaner. (I have the old style air cleaner) Upon further inspection I found that the fuel vent line coming from the fuel pump was pouring gas into the prefilter, so much that the pan of the air filter had about 3 or 4 tablespoons lying on the bottom as well. I took a closer look and discovered what looked like steel wool shoved into the vent?? hole on the bottom of the air cleaner. I removed the steel wool only to find it completely clogged. I searched through the manulas found only on this <AWESOME WEBSITE> and couldn't see any reason for this "addition" being in place. I removed the steel wool, fired up my truck, and "I'm in lOVE"...Man it's like a completely different rig! Runs smoother, idles like a kitten, even runs quieter! I'm wondering if anyone has seen this before? The vacuum lines leading to the carb and air cleaner were missing some clamps, replaced and WOW!!! What a total difference. I've included some pictures to illistrate what I am looking at on my truck. I'm starting to get into some more serious restore and tuneup, so stand by experts! Great site and I'm so glad to be a part of it!
    <I can't figure out how to post the pics I took>Oh wise ones?



    Last edited by Binford; January 8th, 2008 at 12:22 AM. Reason: Posted the pics

  2. #2
    Join Date
    Oct 2006
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    Port Orchard, Wash.
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  3. #3
    Join Date
    Sep 1998
    Location
    North Central Wisconsin
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    11,520

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    The bolt and plate holding the air cleaner down isnt stock...these type had a rubber collar on the bottom of the air cleaner that went over the carb neck and had a hose clamp type of ring over the rubber part with a long handle sticking out to the front that allowed it to be turned by hand to loosen or tighten it.

    Glad it is running better...usually fuel coming out of that vent is due to the fuel pump diaphragm being wasted.

    It been so long since I have had the stock air cleaner, I cant be sure, but I dont remember anything there...maybe it is a mesh type filter screen and ees to be cleaned really bad? It may not belong there at all either...like I said, its been a while.

    Glad it is running good now...ENJOY!!

  4. #4

    Default

    you might not have the stock carb. It doesn't usually have the threaded center stud. The stock air cleaner has a metal clamp and a threaded rod to close it. Also, as Jon said if you had lot's of fuel in your air cleaner then the fuel pump diaphragms are likely bad. Don't run the engine until you fix it. If you fill the crankcase with gasoline (which will happen with a bad fuel pump) you will burn up your main bearings in short order.

    Vacuum leaks will cause it to run poorly. Another place for leaks is the wiper switch and vacuum lines.

  5. #5

    Default

    My air cleaner has the same wool screen in that hole, good or bad. My rig has been running pretty good, always room for improvement though. I'm going to check it for the build up you spoke of.

    Also, I though that the vacuum system on the wipers didn't effect the engine performance, separate systems. I've heard of people noting a slight idle change if completely open to draw air though.

  6. #6

    Default

    Some trucks have replacement fuel pumps without the vacuum pump and run the wiper from manifold vacuum. One of the first things to do should be to replace the 40 yo fuel, vacuum and radiator lines with fresh rubber.

  7. #7
    Join Date
    Jan 2007
    Location
    Fort Smith, Arkansas
    Posts
    911

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    Quote Originally Posted by adk4x4 View Post
    My air cleaner has the same wool screen in that hole, good or bad. My rig has been running pretty good, always room for improvement though. I'm going to check it for the build up you spoke of.

    Also, I though that the vacuum system on the wipers didn't effect the engine performance, separate systems. I've heard of people noting a slight idle change if completely open to draw air though.
    Any vacuum leak will affect performance to some degree.

  8. #8

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    Quote Originally Posted by Stkelsey View Post
    <I can't figure out how to post the pics I took>Oh wise ones?



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