C3 Vette Registry - The Best Resource on the Net for C3 Vettes! C3 Vette
Forums -> C3 Fuel, Emission Control, and Exhaust Systems
Not Logged In! Login or Register!  Users Online: 27 / Help 
Features  Find C3 Parts on ebay in only 2 or 3 clicks!  | Add YOUR C3 to the Registry

Supporting Vendors
Mid America Motorworks
Volunteer Vette Products
CorvetteClothing.com
Bair's Corvettes
VetteBookStore.com

C3 of the Month
None Current
Enter Yours Today!
Online C3 Show
13
C3s are Registered

Vanity Plates
CARLYS
Kid Carly
Featured Links

Buy Now
Collector's Originality Guide Corvette 1968-1982 (Paperback)
Collector's Originality Guide Corvette 1968-1982 (Paperback)


Corvette Magazine - $19.99 for 8 issues
Corvette Magazine
Only $19.99 for 8 issues


Chevrolet Corvette: 1968 thru 1982, All V8 models (Haynes Manuals) (Paperback)
Chevrolet Corvette: 1968 thru 1982, All V8 models (Haynes Manuals) (Paperback)


Motor Trend - $5 for 12 issues.
Motor Trend
Only $5 for 12 issues.



| Hide Signatures and Profile Pics

 New Topic New Topic Post Reply Reply New Poll New Poll Search     Search Page [1]  
6/28/16 12:57pm - Original Message: '1972 Fuel Leak'
gtr1999
Limited Member
- Send Private Message


Wallingford, CT - USA

Vette(s):
1969 350 4 spd drop top 1972 350 auto coupe

Joined: 5/2/2016
Posts: 53
I posted this on NCRS and figured I would share with you.
 
I was out in my 72 on Sunday and filled the tank before stopping for 1.5 hours. When I came out I found gas dripping out behind the LF tire area. I was confused, knowing the gas line from the tank to the fuel pump is on the RH side.
 
So I took a look underneath and saw the original charcoal tank had gas dripping out pretty good, about a qt or so into a plastic container we placed under it. I forgot about the gas vapor line from the top L H side of the gas tank. There is a check valve there and a hose running down the LH frame rail to the top of the charcoal tank under the LH fender.
 
The guys on NCRS confirmed what I suspected, I overfilled the tank, the check valve didn't work as it should and flooded the charcoal tank. Joe Lucia also confirmed the filler necks on the 70-74's are deeper to prevent over filling unless you do what I did and filled it up too much.
 
I let it drip, started up and it stopped, drove 15 miles home without a problem and it was fine.
 
I've owned this car since 1979 and never had this happen before so the check valve must have just failed the other day.
 
Just thought I'd pass it along in case anyone else has this issue.
 
Gary
 Reply Reply  Quote Reply w/Quote
 
Support C3VR!
Suport our advertisers
6/28/16 6:54pm - Reply: 'Re: 1972 Fuel Leak'
Vman73
Standard Member
- Send Private Message


Gig Harbor, WA - USA

Vette(s):
1973 L82 4 Speed Coupe - Very original, well documented driver/survivor. 2016 Bend Regional NCRS Top Flight.

Joined: 10/2/2014
Posts: 353
Gary, thanks for posted this info, I also read your post on the NCRS Forum. I've owned several C3's over the years and never heard of that particular issue. I'll keep an eye out when filling my '73. Thanks again, John.

____________________________________
John Sigmund
valkman57@sbcglobal.net
NCRS Member 61302
NW NCRS Chapter Member



Duct tape is the new Black !!
 Reply Reply  Quote Reply w/Quote
6/28/16 8:04pm - Reply: 'Re: 1972 Fuel Leak'
73shark
Standard Member
- Send Private Message


Overland Park, KS - USA

Vette(s):
1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.

Joined: 7/9/2003
Posts: 375

My 73 did something similar but it wasn't due to over filling the
tank. The valve on top had cracked and wasn't allowing the absorbed vapors from being sucked into the manifold and therefore allowed the charcoal to become saturated. Fixed the valve and was OK after that.

|UPDATED|6/28/2016 5:04:48 PM (AZT)|/UPDATED|


____________________________________

1973 L-82 4 spd

 Reply Reply  Quote Reply w/Quote
6/28/16 8:10pm - Reply: 'Re: 1972 Fuel Leak'
gtr1999
Limited Member
- Send Private Message


Wallingford, CT - USA

Vette(s):
1969 350 4 spd drop top 1972 350 auto coupe

Joined: 5/2/2016
Posts: 53
I believe you are referring to the black plastic valve correct? If I recall I had another used tank with one on it and it was so brittle it fell apart.
 Reply Reply  Quote Reply w/Quote
6/28/16 10:07pm - Reply: 'Re: 1972 Fuel Leak'
Adams' Apple Lifetime Member
Lifetime Member
Moderator
- Send Private Message


Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19448







____________________________________
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"
 Reply Reply  Quote Reply w/Quote
6/29/16 9:30am - Reply: 'Re: 1972 Fuel Leak'
73shark
Standard Member
- Send Private Message


Overland Park, KS - USA

Vette(s):
1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.

Joined: 7/9/2003
Posts: 375
gtr1999 said: I believe you are referring to the black plastic valve correct? If I recall I had another used tank with one on it and it was so brittle it fell apart.


Mine was on top of the canister and IIRC, it simply came unsealed where the two halves we joined.

 But that was 20 years ago and I've slept since then.  ;)


____________________________________

1973 L-82 4 spd

 Reply Reply  Quote Reply w/Quote
6/29/16 8:33pm - Reply: 'Re: 1972 Fuel Leak'
gtr1999
Limited Member
- Send Private Message


Wallingford, CT - USA

Vette(s):
1969 350 4 spd drop top 1972 350 auto coupe

Joined: 5/2/2016
Posts: 53
Yes that is it and it is on the upper LH side of the tank. Right where you can't reach it with the muffler in place!
 Reply Reply  Quote Reply w/Quote
6/29/16 10:28pm - Reply: 'Re: 1972 Fuel Leak'
73shark
Standard Member
- Send Private Message


Overland Park, KS - USA

Vette(s):
1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.

Joined: 7/9/2003
Posts: 375
Another good reason for side exhaust.   Wink

____________________________________

1973 L-82 4 spd

 Reply Reply  Quote Reply w/Quote
7/6/16 3:52pm - Reply: 'Re: 1972 Fuel Leak'
danascar
Standard Member
- Send Private Message


Germansville, PA - USA

Vette(s):
1974 Coupe 358ci 4 speed Black w/Medium Saddle interior w/79 custom leather seats

Joined: 1/28/2010
Posts: 763
Had the same problem with my 74. Ordered new separator and replaced and in the process of replacing separator found both rubber hoses attaching to valve dry rotted and cracked badly, separator was fine but replaced anyway. I epoxied all joints on valve to prevent future possible leaking of valve.




|UPDATED|7/6/2016 12:52:14 PM (AZT)|/UPDATED|


____________________________________
http://www.c3vr.com/member_uploads/14001_14100/14006/IMG_256920168147411r.jpg


 
Dan T
 

 Reply Reply  Quote Reply w/Quote
7/6/16 7:23pm - Reply: 'Re: 1972 Fuel Leak'
gtr1999
Limited Member
- Send Private Message


Wallingford, CT - USA

Vette(s):
1969 350 4 spd drop top 1972 350 auto coupe

Joined: 5/2/2016
Posts: 53
I was out over the weekend. Stopped filling up once the level was at the bottom of the fill neck, came up, topped it a little then stopped. No leaks. That is how I'll leave it until I have time to work on it. Since I don't like the Flow master 50's on the car now I'll handle it with the exhaust change out.
 Reply Reply  Quote Reply w/Quote
4/3/17 5:13pm - Reply: 'Re: 1972 Fuel Leak'
wetvet
Standard Member
- Send Private Message


Lake Oswego, OR - USA

Vette(s):
1972 Steel Cities Gray T Top. Original Owner, Original Paint and Interior. The running gear has been rebuilt after 240,000 miles.

Joined: 10/17/2003
Posts: 540
Yes these separators do leak . I kept smelling gas when I parked the car in the garage after a drive. I thought it was a tank leak or a fuel line. Turned out that the side of that separator just became un-sealed (glued). Replaced with a new separator and all is fine now.

____________________________________

(click to see a larger image)


"It Takes A Little Longer To Do It Right"
"It Takes A Lot Longer To Do It Again"
 Reply Reply  Quote Reply w/Quote
 New Topic New Topic Post Reply Reply New Poll New Poll Search     Search Page [1]  
 Forums -> C3 Fuel, Emission Control, and Exhaust Systems
(Moderator: Adam Wartell, Norsky, Adams' Apple, kstyer)
 

 
Official C3 Vette Registry Community:
Home | Forums | Email | Who's Online | Clubs | Events | Member Stats

Other Official C3 Vette Registry Areas:
Members | Research | Shop | My Account | About C3VR
 

Corvette is a registered trademark of the General Motors Corporation(GM) & Chevrolet Motor Division. Vette Registries, LLC is responsible for all site content (except for member submitted content or where otherwise noted) and does not claim or imply that Chevrolet or GM is responsible for Official C3 Vette Registry content. Vette Registries, LLC is independent from GM and is not affiliated with, sponsored or supported by GM.  Copyright/trademark/sales mark infringements are not intended, or implied and are in fact used to support GM, Chevrolet and Corvette

Official C3 Vette Registry content is Copyright 2001-2017, Vette Registries, LLC. Content may not be reused without written consent. All Rights Reserved. NS

Corvette (Vette) Model Years on this site: 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 30