Jump to content

M42 Swap evap/vapor tank options


Recommended Posts

 

Finishing up an m42 swap and had some questions on my options regarding purge control valve, vapor tank etc.

 

The car (1976) did not have the in-trunk expansion tank and the tank filler was vented directly out of the trunk when I bought the car, and its been that way ever since.

 

The m42 did not come with a purge valve.

 

The way I see it is my options are keep venting straight out and either add a dummy purge valve or resistor to eliminate the CEL. 

Do the same but add a charcoal canister before venting to slightly offset the eco-damage/fuel smell.

Buy a used stock expansion tank, m42 purge valve, run the vent all the way up the car to the TB and hook it up as intended.

 

Although I am a certified tree-hugger, the last option seems like far too much work and expense for a car that will be driven occasionally at-most. Am I completely misunderstanding how this stuff works? I know a proper operating system should have slightly better mileage since it burns the vapors instead of dumping them, but is it that big of a deal? Can I add the expansion tank and still avoid running another hose to the engine bay and collect and return the vapors in some other manner?

 

Best,

Peter

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...