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When my son bought his '71 convertible, the guy he bought it from showed me a black plastic thing he called a roll over valve. He said it goes on top of the gas tank, has a rubber hose attached, and prevents gas from leaking if the car rolls over. Is this correct and which hose is connected to it? I have checked with my friend in a Chevy parts dept. and he can't find it listed nor does he know about it. Any explanations are greatly appreciated.
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Re: Valve?
Sounds like you are talking about the drain hose. The rubber boot between the body and the filler neck has a hole for a plastic nipple. A hose from the nipple outlet runs down the outside of the tank, and on my '63 the end is tied with a plastic strap to the inner bumper bracket on the right hand side. The purpose of this is to drain any water that could work it's way past the outside access door which is not sealed. The AIM for your year will show the details. "Rollover valve", eh? That's one of the more interesting Corvette myths I've heard,lately. Of course, eventhough I'm no '71 expert, I'll be real embarrassed if someone can confirm this "myth".
DUke -
Re: Valve?
Sorry no roll over valve in 1971. If you roll it over all the gas leaks out.
Actually if you have Rochester carb there may be a little piece of rubber on the fuel filter that is a roll over valve, but I believe this is not OEM feature for 1971 or 1972 - just available on replacement filters (none of which is visible). I am not sure the same feature might work on the Holleys if you choose to use a "paper" fuel filter.
There is black plastic part that attaches to upper left of fuel tank in 1971 and newer (I don't know how far up it goes) that is vapor/fuel separator and is part of vapor recovery system, but I am not aware that it has anything to do with roll over.
Me thinks someone is pulling your leg a little bit.
Terry
TerryComment
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Re: Valve?
Steve, Dukes' got to be right. I think it should be"overflow valve", not the other. The plastic valve pushes through a hole in the rubber cup that surrounds your gas cap. the overflow hose is pushed over the outboard end. the hose routes down the rear of the tank, into the inside top of the right rear bumper,exiting from the bottom of same(one inch or so) There should be a coiled spring inside the bottom 6 inchesComment
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Nipple, not Valve
I don't mean to be picayunish, guys, but it's a nipple not a valve. The p/n in my '63 AIM is 3785142. Maybe someone with a '71 AIM can check to see if it's the the same or a different number eight years later.
DukeComment
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Re: Nipple, not Valve
Duke----
The part in question is described by GM as a NIPPLE; it has no valve function or properties. It merely connects the filler neck SEAL("boot")to the drain hose.
The 65-82 part number for this part is 3849610 and you can still buy it from GM for a list price of $0.93.In Appreciation of John HinckleyComment
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Re: Valve?
Steve----
The part in question has absolutely NOTHING to do with "roll-over spill prevention". Based upon your description of the location of the part, I'm quite sure that I know which part you're talking about. This part is a fuel vapor seperator used as part of the evaporative emission control(EEC) system on 1970 Corvettes with NA9 and all 1971-1974 Corvettes.
This part is a black plastic device which mount to a bracket on the top left side of the fuel tank. It was GM #7028035 and was discontinued many years ago. This is not a part that you want to need. Due to their construction and exposure to fuel, they are a life-limited component. Besides having been discontinued long ago with NOS supply virtually exhausted, they are not reproduced.In Appreciation of John HinckleyComment
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Thank you
Thank you Joe, and all who responded.Comment
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