| Re: [GMCnet] smog/vent? [message #74423 is a reply to message #74408] |
Fri, 19 February 2010 22:51   |
midlf
Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)
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Senior Member |
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| Ken Burton wrote on Fri, 19 February 2010 21:23 |
Terry,
I'm NOT looking at any documentation but here is what I remember. Mounted on the top of each tank is a vent fitting. It is all by it's self and not part of the pick up assembly that you removed to get to the socks. The two fittings (one from each tank) are hooked by a hose to a TEE just sitting somewhere on top of the tanks. It is probably on top of the rear tank. From that "tee" another hose runs to a the fuel separator mounted in the left wheel well. A second hose from the fuel separator runs along the frame rail to the front charcoal canister. If you have a California coach like mine there will be two fuel canisters plumbed in series.
One note on that separator. It is a floating ball check valve that is suppose to shut off if liquid gasoline enters to prevent liquid from entering the line to the charcoal canister. So connecting the correct line to the each port of the separator is important there.
I hope this is the info that you wanted.
Ken B.
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For a diagram of the vent system see the maint manual X-7425 section 8 page 8-2 figure 1 It shows the layout of the lines. On my 74 GMC did not put the "T" on top of the tanks. It was in the wheel well close to the shield that protects the lines where they cross over the frame and go into the wheel well. If you look just to the left of the left shock absorber on this picture you can see the "T" just above that shield:
http://www.gmcmhphotos.com/photos/showphoto.php?photo=24754&title=getting-started&cat=4936
The hose connections to the separator are shown here:
http://www.gmcmhphotos.com/photos/showphoto.php?photo=30403&title=starting-to-put-it-back-together&cat=4936
As shown in the maint manual the line to the front mounted vapor canister goes to the top connection of the separator.
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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