Hey guys, I pulled the codes on my truck and I am getting code 85 for the vapor canister and I started looking at it and I realized there are vacuum lines missing from it, and its been messed with before. I think I am going to just remove the entire system and plug the vacuum lines at the throttle body.

I have read all about it and they only down side to disabling it according to my research is that the code will not go away. But all the system does is vent the fuel vapor into the charcoal canister and back into the intake path correct? Its there to stop the system from venting vapor into the atmosphere for environmental reasons not because its mechanically needed. Does this sound correct? Is it ok to remove everything?

Thanks!

 

I am curious to see what you are talking about. Got any pics? And where its located on your truck?

 

I'll have to snap a few pictures in the morning its 1am here. But there are two canisters on the right side of the truck up by the radiator and they are mounted to the fender liner I believe. The fuel tank vent runs into them and then there is a vacuum line that runs to a valve on the throttle body that is hooked to a vacuum source on the throttle body I believe.

So instead of fixing a useless system I want to eliminate it.

 

I think I might know what you are taking about. Has a hard plastic line running on the outside of the frame to it?

 

pretty sure the line running to it is steel, then like 6" before the canister is rubber

 

Im in MA, forgot to mention that.

 

It should be a hard black plastic line, then it will turn into a regular rubber vac line before the canister. Sounds like it may have been tampered with already.

 

I am sure it has been, although I am pretty positive it is a metal line all the way from the tank to about 6" from the canister. Anyways do you guys see any issue removing the entire system? Just venting the tank out in back of the truck?

 

Removing any emission device is against the law, even if you don,t have emission testing in your area. You could fail a visual inspection if they do that in your area also. The charcoal canister doesnt hurt perfomance, so why not try to make it work again?

 

you can definitely just cap off the lines. You are right about it being environmental emission BS! it just stores fuel vapor from tank and then pulls the vapor threw the intake when it can be burned (throttle down). You should be able to just cap both sides. No need to get any water/dirt into your intake/fuel tank! The fuel tank will vent through the fuel cap (if needed).

 

I removed mine , and just ran a rubber line from the back vent tube up to the front fuel door and put a breather on it ,( i removed my front tank )....

 

+1

Emmission control devices ARE NOT BS as has been mentioned by another poster.... Evidently that poster is too young to remember the smog pall that hung over cities in the old days. YUK!

David

 

I never said emissions equipment was BS, actually not sure anyone did. But it is still not staying on the truck unless it is required to run properly. I am not going to put money into a charcoal canister to catch fuel vapor....seems silly to me. But we are all entitled to our opinions

 

I have a thought [AND IT SCARES THE HEEBIE JEEBIES OUTTA ME!!!!!], because I have been wondering about this as well.

If this is just FUEL VAPOR, what exactly is the point of having the canister? Why couldn't the vent line run direct from the tank to the TB? And, further more, if this were the case, why would a purge valve solenoid be necessary? Why couldn't the canister and the purge valve be eliminated altogether and just have a line running straight from the tank to the TB?

Let's ignore the fact that eliminating them will trigger codes. I want to know what the practical effect on the engine is [performance or otherwise] if this were to be done. And I want to ignore the codes part because some pre-computer engines also have charcoal canisters, so for my part I am not concerned about the computer aspect of it.

Depending on the answers I am considering doing this to my 91 F150- and this could be an option for the OP as well.

 

You are correct, you never said emmissions stuff was BS, that was in response to another poster.

As to fuel vapors, or better described as unburned hydrocarbons, weither from fuel evaporation (such as a open tank vent) or incomplete combustion are the #1 cause of smog.

Smog is the technicaly the reaction of sunlight & low level ozone with the unburned hydrocaron molecules.

Which is why these molecules are trapped by the vapor cannister and then burned.

Note that "smog" in the common definition has nothing to do with diesel soot / smoke as some would think, that is a different pollutant.

Same with burned hydrocarbons, different pollutant.

This is why your truck has the cannister and why it is a good idea to keep it operational so we can all breath a little easier.....

But again, YOU never said emmsions (environmental) controls were BS, and I wanted to mae sure that you did not think that I was putting words into your mouth.

Enjoy your Ford !

David