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Topic: Rear fuel leak

in Forum: C3 Fuel, Emission Control, and Exhaust Systems

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Rear fuel leak

Posted: 7/6/13 7:48pm Message 1 of 8
Case75
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Canada
Joined: 6/19/2012
Posts: 230
Vette(s): 1975 Corvette 383 stroker w/Patriot 190 heads, Eagle stroker kit, Comp 279TH7 cam, DUI distributor, Edelbrock 7116 intake, Edelbrock 1806 carb, Hedman Hedders, TH400 w/TCI Breakaway 2400 stall, Transgo 1-2 shift kit.

I have discovered a fuel leak at the rear of the car on the passenger side. Fuel is running off of the vehicle frame and down on to the muffler but only when the car is running. After shutting the car off it stops shortly afterward. I suspect a rubber fuel line is leaking but can't see up in there very well without a lift. The car is a '75 coupe. Anyone had this problem before?









|UPDATED|7/6/2013 7:48:59 PM (AZT)|/UPDATED|



 
Build Date: May 7, 1975. 383 w/267 RWHP/310 RWTQ
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Re: Rear fuel leak

Posted: 7/6/13 8:37am Message 2 of 8
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Adams' Apple
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Duncanville, TX - USA
Joined: 11/8/2003
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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
It will be either the connection where the rubber line from the tank connects to the steel line on the car, or just a hole/crack in the rubber line itself. Could be either the main feed line OR the return line, but return line sounds more plausible, since it only leaks while running.
Gotta get up in there and have a look-see. Easy enough to change the rubber lines, so I would suggest doing that, anyway. Be sure the metal lines don't have a rusted out spot in them somewhere in the area, too, but my guess is one of the rubber lines has failed.



Joel Adams
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Re: Rear fuel leak

Posted: 7/6/13 7:47pm Message 3 of 8
Case75
Former Member
Send PM
Canada
Joined: 6/19/2012
Posts: 230
Vette(s): 1975 Corvette 383 stroker w/Patriot 190 heads, Eagle stroker kit, Comp 279TH7 cam, DUI distributor, Edelbrock 7116 intake, Edelbrock 1806 carb, Hedman Hedders, TH400 w/TCI Breakaway 2400 stall, Transgo 1-2 shift kit.
Thanks Joel. Makes sense that it is probably the return line as you say. I have a set of ramps that I can back it up on to for a better look. What size diameter are the two lines?


 
Build Date: May 7, 1975. 383 w/267 RWHP/310 RWTQ

Re: Rear fuel leak

Posted: 7/7/13 6:13am Message 4 of 8
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Adams' Apple
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
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
Main feed line should be 3/8", return line prolly 5/16".....but it may be 5/16" main with a 1/4" return....memory a little fuzzy this early in da morn....LOL


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"

Re: Rear fuel leak

Posted: 7/7/13 7:06pm Message 5 of 8
Case75
Former Member
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Canada
Joined: 6/19/2012
Posts: 230
Vette(s): 1975 Corvette 383 stroker w/Patriot 190 heads, Eagle stroker kit, Comp 279TH7 cam, DUI distributor, Edelbrock 7116 intake, Edelbrock 1806 carb, Hedman Hedders, TH400 w/TCI Breakaway 2400 stall, Transgo 1-2 shift kit.
Thanks again Joel. I just ordered all new rubber lines. The two at the tank and the two up at the pump. Figured I may as well replace them all as they're over 38 years old. Not very expensive insurance I figure.


 
Build Date: May 7, 1975. 383 w/267 RWHP/310 RWTQ

Re: Rear fuel leak

Posted: 7/12/13 7:22pm Message 6 of 8
Case75
Former Member
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Canada
Joined: 6/19/2012
Posts: 230
Vette(s): 1975 Corvette 383 stroker w/Patriot 190 heads, Eagle stroker kit, Comp 279TH7 cam, DUI distributor, Edelbrock 7116 intake, Edelbrock 1806 carb, Hedman Hedders, TH400 w/TCI Breakaway 2400 stall, Transgo 1-2 shift kit.
Installed the new fuel lines today and everything is good now. Dropped the tank down to check the sending unit gasket and overall condition of the tank. Tank was still like brand new after 38 years. The spare tire is the original Firestone 500 white wall and it still held air!


 
Build Date: May 7, 1975. 383 w/267 RWHP/310 RWTQ

Re: Rear fuel leak

Posted: 7/12/13 8:00pm Message 7 of 8
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Adams' Apple
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
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
Good deal on the fuel lines!Clap

Please...do not EVER run that 500 tire on yer car. it's likely to explode any second. The only thing it is usable for now is show duty, and points. Ouch



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"

Re: Rear fuel leak

Posted: 7/13/13 5:26am Message 8 of 8
Case75
Former Member
Send PM
Canada
Joined: 6/19/2012
Posts: 230
Vette(s): 1975 Corvette 383 stroker w/Patriot 190 heads, Eagle stroker kit, Comp 279TH7 cam, DUI distributor, Edelbrock 7116 intake, Edelbrock 1806 carb, Hedman Hedders, TH400 w/TCI Breakaway 2400 stall, Transgo 1-2 shift kit.
Adams' Apple said: Good deal on the fuel lines!Clap

Please...do not EVER run that 500 tire on yer car. it's likely to explode any second. The only thing it is usable for now is show duty, and points. Ouch

Not a chance of that Joel. I have CAA (Canadian AAA) if I get a flat. I should buy another rim and tire to put in the carrier really if I was smart and put the original in the garage.




 
Build Date: May 7, 1975. 383 w/267 RWHP/310 RWTQ

in Forum: C3 Fuel, Emission Control, and Exhaust Systems


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