Fuel tank vent

[CommrclDiver]

Ok, this is what I got, I got a vent coming from my fuel tank into what I have been calling a charcoal filter and from that filter there is a cardboard looking hose that is mangled. The questions I have are, What is that thing that I have been calling a charcoal filter and, Where did the cardboard looking hose go to originally

[fordman]

it is a charcoal canister.

[Mancar1]

It went to the intake so the fumes could be burned in the engine. The charcoal canister was designed to reduce emissions, increase mpg, and it supposed to improve performance. I would think it reduces some emissions, maybe a little hard to determine mpg increase, performance??? Do you need it for your engine to run properly? No. If you have to have your truck pass an emission test you will need it.

[Racer Z]

The charcoal canister is a place for evaporating fuel to collect while the engine is not running. When the engine starts, the fumes get cleared out by going through the carburetor and burning. It was an early attempt to reduce unburned fuel from entering the atmosphere. Unless your area legally requires you to keep it, you can ditch it all and go back to a more normal setup. If your area requires you to keep it, you will need to fix it.

I live in sunny Southern California where we have the strictest smog regulations and anything 1975 and older is smog exempt. 1976 and newer trucks have a lesser penalty than cars. If it was mine, I would remove it and convert it backwards to something more civilized.

Before you do anything, check-up on what your area legally requires for your year of truck.

[CommrclDiver]

What I am hopeing to do is rid myself from some of the gas fumes in the cab. Would hooking it up help with that?

[mybros71]

The best way to get rid of the fumes in the cab is to get the tank out of the cab. If you remove the components, keep them. Smog exemptions forolder vehicles was enacted with the stroke of a pen, and can as easily be repealed, especially with the political climate in California. You are in Texas and I don't know what the law is there. So X2 on what Racer Z said about checking lagality.

If you remove the canister, you are still going to be left with a vent line coming from the tank to the engine compartment you will need to plug. If you remove this vent line, you will have two more holes in your tank you will need to plug. Relocation of the tank outside the cab is pretty easy, depending on how fancy you want to get. Anywhere from the temporary move to the bed directly behind the cab and a filler inside the bed, to use of a saddle tank or Mustang tank between the fraimrails behing the rear end. A lot of folks on here have done all kinds of gas tank relocations.

[fordman]

gas fumes in the cab means the filler neck hose is bad.

[Racer Z]

What I am hopeing to do is rid myself from some of the gas fumes in the cab. Would hooking it up help with that?

gas fumes in the cab means the filler neck hose is bad.

If all you want to do is stop the smell of gas, replace all the rotting rubber lines. Don't skip a beat. Don't say, "That looks good enough." Unless you replaced it within that last few years, it is 40 years old and ready to fall off. I will bet good money that these trucks did not smell of fuel when they were new.

[mybros71]

If all you want to do is stop the smell of gas, replace all the rotting rubber lines. Don't skip a beat. Don't say, "That looks good enough." Unless you replaced it within that last few years, it is 40 years old and ready to fall off. I will bet good money that these trucks did not smell of fuel when they were new.

Both my dad and my next door neighbor who still owns his 1970 F-100 said their trucks smelled a little when they were new. My dad said it was to get you high so you would not notice how rough riding his highboy was. My neighbor said: "Well you are sitting 12 inches from the filler neck."

[cdeal28078]

[quote="mybros71"]The best way to get rid of the fumes in the cab is to get the tank out of the cab. If you remove the components, keep them. Smog exemptions forolder vehicles was enacted with the stroke of a pen, and can as easily be repealed, especially with the political climate in California. You are in Texas and I don't know what the law is there. So X2 on what Racer Z said about checking lagality.

I have a 71 F100 with the fuel tank that has all of the emission hoses on top of it and it once had the charcoal can with the other hose going to the air breather. Since I fixed the gas cap gasket I never smell any fuel vapors inside the cab.
Clint

[CommrclDiver]

In the county I live in in Texas, your vehicle is exempt from emission testing if it is 24 years or older. Shoot I'm riding around with side pipes on mine and have been for the last 5 or 6 years. I was asked about the charcoal filter once about 10 years ago from one inspection place and have never been asked about it again.

Back to the original question about gas fumes in the cab. So the Mustang tanks will fit between the frame rails huh?

[Mancar1]

gas fumes in the cab means the filler neck hose is bad.

I agree with Fordman, and Racer Z. I have the in cab tank with no fuel smell in the cab.

[Florian]

Just one stupid question: is this the charcoal filter you´re talking about?



Thanks!

Florian

[CommrclDiver]

Just one stupid question: is this the charcoal filter you´re talking about?

[ Image ]

Thanks!

Florian

[fordman]

florian yes that is the charcoal canister.