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the red line that comes off the fire wall,fuel tank vent line?where does this traditionally plug into? I put a weber copy on my truck,most of my hoses and lines were removed b4 i got the truck,76 luv,my redline adapter plates dont have fittings on them by the way. thanks

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76 mikado project,mean green

The red line comes from the fuel tank vapor separtor that is mounted in the front left cornor of the bed. It goes to a check and relief valve on the passenger side of the firewall. From there, 2 hoses come out and 1 goes to the air cleaner and 1 to the oil pan. Basically the valve allows any vented fuel vapor to be drawn into the air cleaner and also allows any air going into the fuel tank to be filtered. The same goes for the second line to the oil pan. Most important is in case of a back fire it acts as a check valve so your fuel tank and oil pan dont go "KABOOOOM". There is a person here that swears this is not a correct set-up, sooner or later he is in for problems.

The check valve opens at 1.0-1.4 in. HG
The relief valve opens at .2-06 in. HG

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Certified pilots, looking down on people since 1903.

I know who you are talking about,asking for trouble!! I have a rectangular aftermarket air cleaner,should I put a fitting on the bottom side to route this hose to? thanks for the help.

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76 mikado project,mean green

I ran into this also I put one on the air cleaner and pluged the other one cuz I couldn't figure out where it went I gueSs I better put the other one to the oil pan- which one goes to the oil pan?

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currently working on my 1977 luv truk

I was just gonna ask about that hose that go's to the oil pan, glad i read this post first. Can I plug that off oil pan hose off? Don't mean to thread jack.

I wouldn't plug it off. The oil pan needs to vent, whether it be to the atmosphere or to the check valve.

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OK, I'm over it. Where's the beer?

Very timely post. I'm in the middle of a weber install and wondered about that vent line too. Just let the hose breath on its own(jeez-where to point it??!) OR, could I just utilize the capped EGR port on the carb for this?
Thanks,

Jimbo

I am working on a stock air cleaner delete today, what I plan to do is take the line that goes to the air cleaner now and install a miniature breather onto it so that it can still vent to atmosphere, but so I won't have to plug it into my replacement air cleaner. All other lines will stay the same. Will put the breather right on the check valve fitting. It is a unit that I saw at Pep Boys, I think from Spectre, but I can't find it on their website. It's smaller than all the other breathers though I think about 1.5" in diameter, at my Pep Boys it was near all the cold air intake parts rather than near the chrome valve covers.

Thanks, and what a cool idea. I'll see if I can find one, other wise will make do with a mod to the Weber supplied air cleaner. Any thoughts re: my other post about using the stock Hitichi phenolic spacer with the new 32-36 weber? Perhaps at the least, longer chanfered bolts?
Thanks again,
Jimbo