I changed both the hoses and the separator on my a while back. My leak showed up when I was doing some work on the passenger side and had the car at a pretty good angle. Funny thing is that the new separator leaked too so I had to seal it before I could install it. It is molded out of nylon so epoxy works well on it. I had to drop the exhaust and mufflers on the driver side to be able to reach the valve and hoses. The separator valve has a float inside of it and is suppose to stop liquids from getting into the charcoal canister from folks that overfill the tanks. Rule of thumb is not to top-off the tanks. Always leave it a little room at the top.

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Brian - NCM Lifetime Member

73 coupe L48, Flat-top pistons, Performer RPM Heads, Crane Cam and roller rockers, Holley 650 vac sec. Performer intake,
3.55 gear BTO 200-4R trans,
Leather seats, Seatbelt Plus 3point seatbelts, Pioneer CD player
Magnaflow Exhuast System

http://www.fullthrottlecorvette.com/1970--1974-Corvette-Fuel-Tank-EEC-Valve_p_2468.html

I presume this is the separator valve previously mentioned. Best price I could find.


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DanT

That is the part.

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Brian - NCM Lifetime Member

73 coupe L48, Flat-top pistons, Performer RPM Heads, Crane Cam and roller rockers, Holley 650 vac sec. Performer intake,
3.55 gear BTO 200-4R trans,
Leather seats, Seatbelt Plus 3point seatbelts, Pioneer CD player
Magnaflow Exhuast System

Yeppers....that be it. I would take a look first, to see if it is just one of the hoses, rather than spend $40, and then not need it. If you do get a "new" one, I would do as Brian did on his, and epoxy around the dang seam on it....cause it WILL leak, eventually. My replacement one did, just as Brian's did....

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Joel Adams
C3VR Lifetime Member #56    
My Link


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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

Does that mean my 79 doesn't have one, or is it just a different part? Mine doesn't leak, even when I overfill it (guess I shouldn't have said anything, I'll jinx myself!).

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"Down on the Boardwalk...

(Click image to see a larger version}

I think '74 was the last year for this particular set-up. I think after that, the vapor separator was part of the charcoal canister/purge valve, and the hose from that just runs directly into the top of the tank, with a check-valve....I could be wrong. I should prolly do a little research on that....now you got me curious....
The cars after '74-5 also had the bladders in the tanks, so that prolly has something to do with it, too.


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Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

All my research for them only turned up the valve in the link for just 1970 to 1974.

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DanT

Maybe one less thing to worry about!

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"Down on the Boardwalk...

(Click image to see a larger version}

Well after getting most all the suspension upgrades done I finally got around to tackling the separator valve replacement. Found it and immediately saw that the larger of the 2 hoses running to valve, the one from top of the tank was split open just below the clamp on the valve. Can this hose be replaced without dropping the gas tank? Don't really want to do that if I don't have to. Can it be accessed from tank filler area if rubber seal is removed, and how is that done? Valve actually looked good but I will replace that just to prevent future problems.(I did epoxy the seams) Service manual amd assembly manual really doesn't show much of anything on this There is enough slack in hose to cut bad part off and reattach but I'd like to do it correcty. And so tomorrow it goes all back together again...

|UPDATED|4/1/2013 7:39:08 PM (AZT)|/UPDATED|


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DanT

this diagram might help

The hose can be changed without pulling the tank. You will need to remove the vapor separator, tho. The hoses should have spring clamps on them, unless they have been changed to the worm/screw type. It's a tight fit up in there, past the mufflers, but it can be done. 

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Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"