I've got a question, also....the previous owner had the line going to the cannister pinched off on my '72. The plastic valve mounted on the left side of the tank (it's marked ac delco-Rochester) has the top nozzle broken off which I'm guessing went to the cannister. The intake nozzle (hose from tank runs into it) is not clogged, I ran compressed air thru and it's operational. Here's the question: the EEC system is no longer performing its intended task (filtering fumes), but can the valve still relieve pressure from the tank? As a precaution, should I get a vented gas cap? Thanks.

JR

[QUOTE=princered72]I have a 72 convertible. I removed the tank to redo my rear suspension and found there is a valve on the tank that is to prevent, I believe, liquid gas from getting to the canister which is mounted in the left front fender. the valve is plastic and is not available repro from what I found. You can bypass the valve with no trouble, from what I have been told. I used epoxy on my valve and also redid my canister. [/QUOTE]

When I replaced the tank in my 73 I found there is a plastic valve (on the drivers side, top of the tank) that is to prevent liquid fuel from entering the line to the canister.

In my case the plastic case was cracked and allowed fuel to drip down on the the muffler.

Since the valve is mounted at the very top of the tank I would only have this problem when the tank was full and the gas was sloshing around.

To fix the crack I too used epoxy.

Also, when I installed the new engine I did not run the line from the canister to the carb. I left the canister installed with the line running from the gas tank the canister, but left the carb line end open. This allows the tank to vent if needed. I have never noticed any gas smell either...

If memory serves me correctly, the valve in question is a float valve. Your float may not be floating anymore which allows the canister to suck liquid gas... which splashes into the valve when the gas tank is full.

You might be able to do away with the valve all together and plug the line to the canister (and remove the canister if you want). However, you'll need a vented gas cap or equivalent so that the tank is vented.

 

There is also a paper filter located at the bottom of the canister. Mine was very brittle but intact and clogged from dirt,etc. Have not found a vendor who sells them. May have to fabricate one that will work.

[QUOTE=82CE]There is also a paper filter located at the bottom of the canister. Mine was very brittle but intact and clogged from dirt,etc. Have not found a vendor who sells them. May have to fabricate one that will work.[/QUOTE]

You should be able to get that filter from most auto parts stores. I bought one recently, less then 5 bucks.