Fuel smell
Team Owner
Joined: Sep 2006
Posts: 31,267
Likes: 4,362
From: Westminster Maryland
Hi y17,
Here's a couple of possibilities.
Look for a leak at the connections of the fuel line to the carburetor, and the fuel line at the fuel pump.
Also look at the connection between the hard fuel line coming from the gas tank and the rubber hose that connects it to the fuel pump.
Good Luck!
Regards,
Alan
Here's a couple of possibilities.
Look for a leak at the connections of the fuel line to the carburetor, and the fuel line at the fuel pump.
Also look at the connection between the hard fuel line coming from the gas tank and the rubber hose that connects it to the fuel pump.
Good Luck!
Regards,
Alan
Safety Car
Joined: Oct 2007
Posts: 3,729
Likes: 267
From: Austin Texas
Corvette of the Year Winner 2017
2016 C3 of Year Finalist
I just had the same problem terrible gas smell,
no leaks found, I finally found the fuel pump weep holes slightly wet.
replaced the fuel pump, problem solved.
no leaks found, I finally found the fuel pump weep holes slightly wet.
replaced the fuel pump, problem solved.
Instructor
Joined: Jan 2012
Posts: 201
Likes: 0
From: some hole in the ground town- camp verde:) arizona
i have one 
running it too rich. fuel is flowing back up into the carb. i had this problem once, extremely bad. fuel was shooting out of the carb and soaking the engine bay. this was because i had just rebuilt it (carb) having never seen one before and made my adjustments AFTER i put it in the car.
do as i say not as i do
running it too rich. fuel is flowing back up into the carb. i had this problem once, extremely bad. fuel was shooting out of the carb and soaking the engine bay. this was because i had just rebuilt it (carb) having never seen one before and made my adjustments AFTER i put it in the car.do as i say not as i do
Safety Car
Joined: Oct 2007
Posts: 3,729
Likes: 267
From: Austin Texas
Corvette of the Year Winner 2017
2016 C3 of Year Finalist
if the carb is wet on the inside your needle seat/ float is not sealing.
or your pump pressure is too high not allowing the float to close the needle valve.
or your pump pressure is too high not allowing the float to close the needle valve.
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Racer
Joined: Nov 2011
Posts: 261
Likes: 1
From: Montgomery TX
What year is your C3?
I would check all the vacuum lines from and to the charcoal canister mounted behind the LF wheel well. this is the fuel vapor return system and if any of those hoses are cracked or cut you will get strong fuel smell as the fuel expands and contracts in your tank. It will be strongest right after you drive it and park it then subside as it cools down. If you decide to remove or defeat the canister make sure you install a vented fuel cap.
I would check all the vacuum lines from and to the charcoal canister mounted behind the LF wheel well. this is the fuel vapor return system and if any of those hoses are cracked or cut you will get strong fuel smell as the fuel expands and contracts in your tank. It will be strongest right after you drive it and park it then subside as it cools down. If you decide to remove or defeat the canister make sure you install a vented fuel cap.
Team Owner
Joined: Sep 2006
Posts: 31,267
Likes: 4,362
From: Westminster Maryland
Hi Y17,
There isn't any pressure or vacuum on any of the vapor or pvc lines that are part of the Evaporative Emissions Control System unless the engine is running.
When the engine is running the vacuum then pulls the gas fumes from the sealed gas tank into the canister. The fumes are then pulled from the canister into the carb where they are burned.
What year is your car?
Regards,
Alan
There isn't any pressure or vacuum on any of the vapor or pvc lines that are part of the Evaporative Emissions Control System unless the engine is running.
When the engine is running the vacuum then pulls the gas fumes from the sealed gas tank into the canister. The fumes are then pulled from the canister into the carb where they are burned.
What year is your car?
Regards,
Alan
Advanced
Joined: Oct 2011
Posts: 84
Likes: 2
From: whiting NJ
Had the same problem
Safety Car
Joined: Oct 2007
Posts: 3,729
Likes: 267
From: Austin Texas
Corvette of the Year Winner 2017
2016 C3 of Year Finalist
Replace the fuel pump. it is leaking thru the diaphram,
the gas vapor exits the weep holes on the fuel pump, and mostly evaporates, thus leaving no or min. drip.
the gas vapor exits the weep holes on the fuel pump, and mostly evaporates, thus leaving no or min. drip.
Racer
Joined: Nov 2011
Posts: 261
Likes: 1
From: Montgomery TX
Another thing to check: The vapor line from the fuel tank is a steel line on the inside of the left frame. It ends just behind the L Front wheelwell and a rubber hose connects it to the vapor cannister also mounted behind the LF wheelwell. That hose deteriorates, cracks and can separate and fumes from the fuel tank will come from the end of the vapor line. I had this problem and it stunk up the garage. The vapor canister was removed when I replaced the carb and manifold, I plugged the vapor line to the tank and the smell went away. If you do this you will need to vent your gas cap or buy a vented cap.
Instructor
Joined: Jan 2012
Posts: 103
Likes: 0
From: Sonoma Ca.
Another thing to check: The vapor line from the fuel tank is a steel line on the inside of the left frame. It ends just behind the L Front wheelwell and a rubber hose connects it to the vapor cannister also mounted behind the LF wheelwell. That hose deteriorates, cracks and can separate and fumes from the fuel tank will come from the end of the vapor line. I had this problem and it stunk up the garage. The vapor canister was removed when I replaced the carb and manifold, I plugged the vapor line to the tank and the smell went away. If you do this you will need to vent your gas cap or buy a vented cap.
Last edited by anips; Feb 8, 2012 at 09:39 PM.
