Removal: Vapor Return System?
Thread Starter
Instructor
Joined: Aug 2010
Posts: 246
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From: San Diego CA
Removal: Vapor Return System?
I have a '72 that I'm in the process of bringing back to life in the form of a stripped down driver, and while I'm in there running new brake lines - can I get rid of what I'm assuming is the vapor return system?
Looking at what's currently in the car, I have the hardline that runs down the left frame rail connected to what I'm assuming is the charcoal canister behind the left eggcrate. The back end runs up to a black box connected to the top of the tank, that's currently missing the bottom. (guess from where my tank was spilling on right turns when full!)
Long story short: can I take all this out? The vaccuum line that comes out of the canister currently is disconnected and dangling. Looking around I'm not even sure I can see where it would hook into.
On that note as well: which vaccuum lines are essential to the car? I received the car in "running" condition, but as I'm going through the front and rear ends I'm finding a lot of vaccuum lines that are disconnected and presumably are just vaccuum leaks. Are there any that I can consolidate?
Third: If I pull the AC / Heater core will there be a large hole in the firewall that I'll have to patch?
Thanks for your help, sorry for so many questions!
Looking at what's currently in the car, I have the hardline that runs down the left frame rail connected to what I'm assuming is the charcoal canister behind the left eggcrate. The back end runs up to a black box connected to the top of the tank, that's currently missing the bottom. (guess from where my tank was spilling on right turns when full!)
Long story short: can I take all this out? The vaccuum line that comes out of the canister currently is disconnected and dangling. Looking around I'm not even sure I can see where it would hook into.
On that note as well: which vaccuum lines are essential to the car? I received the car in "running" condition, but as I'm going through the front and rear ends I'm finding a lot of vaccuum lines that are disconnected and presumably are just vaccuum leaks. Are there any that I can consolidate?
Third: If I pull the AC / Heater core will there be a large hole in the firewall that I'll have to patch?
Thanks for your help, sorry for so many questions!
Team Owner
Joined: Aug 2000
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From: Massillon,Ohio USA
2020 C3 of the Year Finalist - Unmodified
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...I did this to the Silver '75 coupe I used to have when I changed it over to a 4spd car.
...I simply removed the canister and hardline and back at the tank I plugged the nipple at the top of the tank. Since a 75's fuel comes out of the top of the tank, not bottom fed, it doesn't have that black plastic anti-siphon/anti-rollover valve that the canister '72-'74s had.
...you will want to run a '68/'69 style vented gas cap too. Since I couldn't do that for my '75, I simply drilled a small 1/16" hole in the unleaded fuel type cap.
...I simply removed the canister and hardline and back at the tank I plugged the nipple at the top of the tank. Since a 75's fuel comes out of the top of the tank, not bottom fed, it doesn't have that black plastic anti-siphon/anti-rollover valve that the canister '72-'74s had.
...you will want to run a '68/'69 style vented gas cap too. Since I couldn't do that for my '75, I simply drilled a small 1/16" hole in the unleaded fuel type cap.
Team Owner
Joined: Sep 2006
Posts: 31,221
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From: Westminster Maryland
Hi s,
Third... when you remove the heater core but leave the box there is no hole. When you remove the box too, you are left with a hole. People make a simple flat cover to bolt in place or do a serious fiberglass patch.
Good Luck!
Regards,
Alan
This is the opening for a non-a/c car.
Third... when you remove the heater core but leave the box there is no hole. When you remove the box too, you are left with a hole. People make a simple flat cover to bolt in place or do a serious fiberglass patch.
Good Luck!
Regards,
Alan
This is the opening for a non-a/c car.
Thread Starter
Instructor
Joined: Aug 2010
Posts: 246
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From: San Diego CA
Would I need to run a vented gas cap if I ran a breather tube from that vapor return box on top of the tank?
