Help with Gas Odor
Racer
Joined: Feb 2013
Posts: 386
Likes: 3
From: Clifton Virginia
Here's a better picture before second fuel line and filter was installed. You can also clearly see the 90 degree nipple where the other end of this nipple is connection to the charcoal canister.
Burning Brakes
Joined: Oct 2011
Posts: 956
Likes: 86
From: McDonough Georgia
The vent line to the charcoal canister used to be where the fumes were forced through back into the carb to reburn.
Blocking of the vent line and adding a vented cap simply allows the pressure to stabilize and not force the fumes out through whatever is the least path of resistance. Since this was done, time to look elsewhere.
I find it very hard to believe that the overflow is the culprit. Just doesn't make any sense. The overflow is above all that. Also, why wouldn't my car make all those smells, and everyone else?
Does your car have the mechanical fuel pump replaced with an aftermarket or electric?
There is also a vent return line on the stock fuel pump to prevent vapor lock. If you changed your fuel delivery system did you block off this vent line?
Blocking of the vent line and adding a vented cap simply allows the pressure to stabilize and not force the fumes out through whatever is the least path of resistance. Since this was done, time to look elsewhere.
I find it very hard to believe that the overflow is the culprit. Just doesn't make any sense. The overflow is above all that. Also, why wouldn't my car make all those smells, and everyone else?
Does your car have the mechanical fuel pump replaced with an aftermarket or electric?
There is also a vent return line on the stock fuel pump to prevent vapor lock. If you changed your fuel delivery system did you block off this vent line?
Thread Starter
Advanced
Joined: Apr 2007
Posts: 65
Likes: 0
Here's the description of the layout:
It's a brand new Eckler's replacement tank for the '78. The sending unit/filler neck is new also, along with a brand new vented cap. Because of the fuel injection, holes were tapped into each side of the tank (one for delivery at the bottom left, and one for return at the top right). The stock delivery/return tubes at the sender/filler are capped off. The vent tube from the sender/filler that goes to the charcoal canister has a short hose that goes to a vent fitting at the top of the tank to the left. From there, another hose is connected that was just an open vent to atmosphere. Thinking that was my problem, I capped that open vent hose. Still have the horrible gas odor....
It's a brand new Eckler's replacement tank for the '78. The sending unit/filler neck is new also, along with a brand new vented cap. Because of the fuel injection, holes were tapped into each side of the tank (one for delivery at the bottom left, and one for return at the top right). The stock delivery/return tubes at the sender/filler are capped off. The vent tube from the sender/filler that goes to the charcoal canister has a short hose that goes to a vent fitting at the top of the tank to the left. From there, another hose is connected that was just an open vent to atmosphere. Thinking that was my problem, I capped that open vent hose. Still have the horrible gas odor....
Burning Brakes
Joined: Oct 2011
Posts: 956
Likes: 86
From: McDonough Georgia
Here's the description of the layout:
It's a brand new Eckler's replacement tank for the '78. The sending unit/filler neck is new also, along with a brand new vented cap. Because of the fuel injection, holes were tapped into each side of the tank (one for delivery at the bottom left, and one for return at the top right). The stock delivery/return tubes at the sender/filler are capped off. The vent tube from the sender/filler that goes to the charcoal canister has a short hose that goes to a vent fitting at the top of the tank to the left. From there, another hose is connected that was just an open vent to atmosphere. Thinking that was my problem, I capped that open vent hose. Still have the horrible gas odor....
It's a brand new Eckler's replacement tank for the '78. The sending unit/filler neck is new also, along with a brand new vented cap. Because of the fuel injection, holes were tapped into each side of the tank (one for delivery at the bottom left, and one for return at the top right). The stock delivery/return tubes at the sender/filler are capped off. The vent tube from the sender/filler that goes to the charcoal canister has a short hose that goes to a vent fitting at the top of the tank to the left. From there, another hose is connected that was just an open vent to atmosphere. Thinking that was my problem, I capped that open vent hose. Still have the horrible gas odor....
It seems to me that if the easy stuff is ok, then the injection system needs to be looked at.
Gas in the exhaust pipes?
Thread Starter
Advanced
Joined: Apr 2007
Posts: 65
Likes: 0
Commander,
Gas in the exhaust pipes? Tell me more. You may be on to something....
Burning Brakes
Joined: Oct 2011
Posts: 956
Likes: 86
From: McDonough Georgia
Normally, a faulty fuel injector will cause gas to flow unburned into the exhaust.
Also, a bad catalytic converter will cause a rich mixture.
The system is normally computer controlled. If this is the case, you need to check the specs for your application.
Also, does your system require a pressurized gas tank? Might be the hiss you hear.
Also, a bad catalytic converter will cause a rich mixture.
The system is normally computer controlled. If this is the case, you need to check the specs for your application.
Also, does your system require a pressurized gas tank? Might be the hiss you hear.
