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Forums -> C3 Fuel, Emission Control, and Exhaust Systems
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7/19/11 10:31pm - Original Message: 'Carb problems. 1980 L-48 stalls'
Former Member
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Kentwood, MI - USA

Currently own: 1980 L-48 automatic. Custom painted in gray metal flake with silver hood accent. Oyster interior. Previously owned: 1976 silver Sting Ray with black interior. 1980 L-48 black with oyster interior.

Joined: 6/11/2011
Posts: 10
1980 L-48 with Rochester Quadrajet carburetor. Randomly stalls while driving and then will not restart immediately. Crank it over a couple of times and will eventually start again, usually after 3-5 minutes. When stalled, hit the throttle while looking into the carb and no fuel flowing into the primary jets. I have replaced the fuel filter, fuel pump, had the float adjusted but it continues to randomly stall while driving. Can be cruising at 50 mph and then just stalls. Any ideas? Thanks for your help.

(duplicate thread deleted)
Adams' Apple2011-07-20 05:03:42
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7/20/11 12:04am - Reply: 'Carb problems. 1980 L-48 stalls'
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sonoma, CA - USA

72 LT-1 AC coupe,69 l-36 coupe

Joined: 8/9/2002
Posts: 784
could be the rubber hoses roting and causing a restricted fuel line,  pull the fuel line at the carb and add a rubber hose to the end of the steel line and put the hose into a good size container and crank the engine, you should get about a pint in about 30sec, don't forget to ground or disconect the distributor,  if equiped check the seperator valve and the charcoal canister, not sure about a 80 vette but most canisters have a replacable paper filter at the bottom, kinda looks like a coffee filter, take a flash lite look inside of the tank, ck for rust or a possible clogged pick up sock. anips2011-07-19 21:15:45

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7/20/11 8:06am - Reply: 'Carb problems. 1980 L-48 stalls'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

#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: 19511
Imma thinkin the same thing...restriction somewhere. Also, try driving with the fuel cap loose, and see if it still stalls. That would point to a clogged purge line/stuck purge valve on the canister. This would create a vacuum inside the fuel tank, and could cause it to starve for fuel until it sits for a few minutes. A vapor lock would do the same thing.

Joel Adams
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12/22/11 7:34pm - Reply: 'Re: Carb problems. 1980 L-48 stalls'
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Badin Lake, NC - USA

1979 Red L-48 Corvette with Doeskin interior, 3-speed automatic, 3.55 rear; 1986 L-98 Coupe, 4+3 Manual - Satin Black and Purple (SCCA TT/Hillclimb Car); 1993 White LT-1 Coupe, Black Interior, 6-speed

Joined: 4/21/2004
Posts: 101
This may or may not be the problem, but I had a similar issue with a Chevy Suburban, with carb, of that vintage...under high load it would just cut out. Turned out it was water in the fuel tank that you would have no issues while at idle in the driveway, but when you would demand full fuel flow, it would flat die out.
So, I used a couple bottles of HEET to help clean it out and eventually just dropped the tank and cleaned it out.  Corvettes of this vintage tend to sit, especially in the winter and condensation can be a real problem.

C3: 1979 Corvette Coupe, Auto, L-48, Red/Doeskin (my wife's fave);
C4s: 1986 C4 coupe (SCCA road race car), satin black, 4+3, Z51 package, L-98;  & 1993 C4 coupe, white, 6-speed, LT-1.
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12/23/11 3:36pm - Reply: 'Re: Carb problems. 1980 L-48 stalls'
aceinthehole Lifetime Member
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Valley Springs, CA - USA

1978,Metalic Money Green W/Gold emblems,TH350 w/gear splitter,black & grey interior.1978,two tone,Metalic Rootbeer & gold ,Doeskin interior,auto. trans. 1981, Silver w/mirrored T-Tops,4 spd, charcoal interior.

Joined: 11/20/2005
Posts: 3618
Another possibility I try to remember is the short pieces of fuel line under the rubber boot at the gas cap. Those lines can crack with age and suck air if they've never been replaced. Easy to check.

Jimmy B.
Just can't wait to get on the road again.

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 Forums -> C3 Fuel, Emission Control, and Exhaust Systems
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