zanimul

Hi All,

I'm getting a heavy amount of gas fume in the garage where my '80 L-82 is parked. I'm a bit concerned over the potential possibility of a fire since the garage is part of the house. I have not dug into this issue, yet, but I'm suspecting the EVAP Canister. Reason, all the hoses are still original, with the exception of the heater and radiator hoses.

Any thoughts/suggestions much appreciated.

MelWff

It could be the evap system as well as anything else in the system. Start at the tank looking for leaks in the tank itself as well as the rubber lines from the tank to the frame lines. Next follow the lines forward to the fuel pump and check the pump itself. Then follow the line out of the pump to the carburetor looking for signs of a leak. The charcoal filter in the evap canister could be soaked and need replacing.

zanimul

I should add that I see no fluids or evidence of leaks on the floor.

OldCarBum

I have the same issue with the 73 I just purchased. I'm going through and replacing all the fuel and evap rubber lines. They are all original so I'm starting there. I was looking through the General Maintenance Section in the Service Manual last night and it recommends to change out the filter in the evap canister every 24,000 miles. I doubt mine has been changed in years, if ever. Napa Auto Parts stocks them and I'll be replacing that this weekend. My gas cap is original as well and I could detect fumes coming from there when I flipped open the cover so I'm ordering a new one. Invest in a service manual and the assembly instruction manuals. They will show you how to properly hook up all the lines and are full of great information. I found the service manual online at Helm and the AIM is available from Corvette Central or Wilcox who both have sponsored adds on the forum. Have Fun.

mortgageguy

As you know, the evap cannnister is on the left front side, just behind the front tire. Stick your nose down near the side vent, you may detect a strong odor in that area. Is so, the charcoal is saturated and needs replacing. I replaced the charcoal and filter in mine last summer. Very easy and solved any fuel odor that I had.

croaker

You checked the weep hole on the fuel pump?

hotrodnick

I have had the same issue, I thought I had a line from fuel pump to carb leaking. I replaced it this winter and seemed ok. When it got warmer I started to get a smell again. About a week ago the 79 died and would not idle. Turned out the Qjet needed rebuilt, still had a rich smell added a electric choke now that odor is gone.

billschroeder5842

No leaks and a strong vapor sounds like the evap canister.

I rebuilt mine a couple of weeks ago. 2 hours and $16 worth of charcoal from PetSmart.

gsimon767

There are two sealed plugs under the base of a Quadrajet carb that are known to leak raw fuel. If you can't find an obvious source of the leak it could be the carb, assuming you have a Quadrajet. You may have to remove the carb to see if the base is wet or raw fuel is in the manifold. Usually you would have some starting or running issues depending on the severity of the leak. If that is the problem a carb rebuild is needed.

BOOT77

Do you have 10% ethanol in your fuel? Google it, made more than a few redo the fuel lines even aftermarket stuff.

edit: if I buy normal fuel line I make sure it says J30R9 on it.

hotrodnick