Deleting fuel vapor canister - good or bad?

jackcarter1971Member

Hey Folks:

Is deleting/removing the fuel vapor canister a good or bad idea? (1971 model yr) What are the pro's and con's?

Currently I have removed the vapor canister, to install a billet dual water tank mount, due to install a 180... one thing, leads to another...

If it is ok to leave off??? should I just cut and or remove the line coming from the gas tank and plug it?

Or do I need to keep some sort of vapor release system? If so what??? and where would it be best be positioned?

So in summary.
1. Is it ok to delete? or not.
2. If yes, ok to delete, what is best way to plug line or tank?
3. If no, what should I do, either with existing canister or new parts? both in terms of what new parts? and where should they be positioned?

Thoughts?

Cheers
jc71

7/16/118:22 AM

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dave2811Member

Yea, it is OK to remove the canister, but DO NOT plug the line. That is a vapor vent that allows the fuel tank to breath.

I have deleted mine and just ran a short hose left and forward of the fuel tank so that any overflow that may occur from topping off the tank will spill away from the hot parts of the motor.

7/16/1112:33 PM

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zr1panteraForum Sponsor - SACC Restorations

IMO that is not a safe solution. A one way check valve may make more sense so air can enter but fuel cannot escape and cause a fire or worse in a rollover situation...

7/16/112:56 PM

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jackcarter1971Member

What would be the best check valve to plumb in? Please let me know any recommendations...

That said, I will probably keep the line running over to the passenger side... extend it down the inside rear fender and then attach a check valve at the end. Thoughts?

7/16/117:02 PM

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joules"Racing is Life, anything before or after is just waiting" - Steve McQueen

Here is Hall's solution that I think many are using.

http://hallpantera.com/cgi-bin...ntera-inc&item=22057

Julian

7/16/119:21 PM

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panterapattMember

I removed mine and put it on a T connection between my PCV connection to the carb.

7/16/1110:25 PM

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angelobMember

quote:
Originally posted by Panterapatt:
I removed mine and put it on a T connection between my PCV connection to the carb.

Why would you do that? Something about putting that vent line to a vacuum source just seems really wrong to me. What if for some reason you had a backfire? Or the PCValve doesn't seal perfectly, during said backfire or engine shutdown you just dumped fuel vapor into your valve covers. Vent yes Vacuum no. Am I missing something here? I just picture a lot of potential hazards.

7/17/115:15 AM

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jb1490Member

quote:
Am I missing something here?

I suspect that he connected it to the crankcase vent hose that goes to the air cleaner. Otherwise, the engine vacuum could collapse the fuel tank, and certainly would make it much harder for the fuel pump to draw fuel from the tank, potentially stopping the flow of fuel to the carb. On the stock air cleaner there is a small filter inside to help protect the crankcase during backfire.

John

7/17/118:06 AM

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angelobMember

PCValve is connected to engine manifold vacuum. He is not connected to an air breather vent from his description. Either way, full tank, semi hard cornering/braking, fuel sloshing into a breather is not good either.

Personally, I would reroute that line. Better safe than sorry.

Angelo

7/17/119:15 AM

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jb1490Member

quote:
PCValve is connected to engine manifold vacuum.

Yes, that is correct, but the PCV system needs to have a "fresh" air supply. This is normally done with a hose from the opposite valve cover to the air cleaner. Perhaps he just made a typo???

The original carbon canister had a hose connecting it to the air cleaner.

John

7/17/1110:06 AM

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panterapattMember

You are right - I mis-typed this - I connected the tank vent to my air cleaner, not the PCV. If I recall, that canister had a connection back to the air cleaner, hence my reason for continuing to connect it back to the air cleaner. That as opposed to leaving it "hanging" in the engine bay. PCV is not in the loop. sorry for the mis-type

Lee

7/17/1110:41 PM

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jb1490Member