C3 General General C3 Corvette Discussion not covered in Tech
Sponsored by:
Sponsored by:

Vapor canister test

Thread Tools
 
Search this Thread
 
Old Feb 19, 2016 | 10:40 AM
  #1  
ftf396's Avatar
ftf396
Thread Starter
Instructor
10 Year Member
 
Joined: Nov 2012
Posts: 124
Likes: 3
Default Vapor canister test

Hi Guys. Can anyone explain how to test to see if the diaphragm on the vapor canister is working. If any one has a diagram that explains the flow patterns (!'m a visual person) that would help.
Thanks
Reply
Old Feb 19, 2016 | 10:27 PM
  #2  
ftf396's Avatar
ftf396
Thread Starter
Instructor
10 Year Member
 
Joined: Nov 2012
Posts: 124
Likes: 3
Default

Originally Posted by Alan 71
Hi ftf,
Here's the ECS diagram from the Emission Controls booklet that went to the dealer's service departments in 1971.
Might this help you?
Regards,
Alan

Thanks Alan. The diagram helped me understand the process, but how do you tell if the diaphragm works?
Fred
Reply
Old Feb 20, 2016 | 09:50 AM
  #3  
ftf396's Avatar
ftf396
Thread Starter
Instructor
10 Year Member
 
Joined: Nov 2012
Posts: 124
Likes: 3
Default

Originally Posted by Alan 71
Hi,
I've only done this once. If I don't smell gas in the garage I figure the system is working.
I check the system by first checking the vapor separator at the left side of the tank… you should hear it 'rattle' when you shake it.
I then check that all the hoses are clear and not collapsed. There's a small 'restrictor' inserted in the rubber line from the hard line to the canister inlet nipple.
I then check the hoses from the canister to the carb; both large and small.
Then I pried off the cap which allowed me to see that the rubber seal is in place in the cap and not torn and the spring and spring retainer are in place.
I then use a wire to insure the purge holes aren't clogged up.
I get no smell of gas from the charcoal so figure it's not saturated with gas so doesn't need to be replaced.
I then pry off the bottom lid to make sure the 'pancake' filter i
saturated either.
Done.
As I said I've only felt the need to do the once while I was restoring the system…. but would have to look at it more often if I were smelling gas.
Regards,
Alan
Thanks that helps.
Fred
Reply

Get notified of new replies

To Vapor canister test





All times are GMT -4. The time now is 04:01 PM.

story-0
10 Ugly Corvettes That We Still Kinda Love

Slideshow: 10 ugly Corvettes that we still kinda love.

By Joe Kucinski | 2026-06-03 10:34:17


VIEW MORE
story-1
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

A lot of money has changed hands at the online auction house over the years.

By Brett Foote | 2026-06-03 10:21:50


VIEW MORE
story-2
10 Things Every Corvette Owner Needs (2026 Edition)

Slideshow: 10 great gifts Corvette enthusiasts actually want for Father's Day!

By Michael S. Palmer | 2026-06-03 15:43:40


VIEW MORE
story-3
8 Most "Only Corvette Owners Understand" Quirks and Problems

Slideshow: These are the quirks, annoyances, and oddly lovable problems that every Corvette owner eventually learns to live with.

By Pouria Savadkouei | 2026-05-28 09:31:39


VIEW MORE
story-4
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

Slideshow: 10 reasons why the C6 Z06 is still a performance benchmark after 20 years.

By Joe Kucinski | 2026-05-27 17:20:09


VIEW MORE
story-5
How Much Horsepower Every Corvette Engine "LOST" in 1972

Slideshow: How much horsepower every Corvette engine lost in 1972.

By Joe Kucinski | 2026-05-27 16:54:53


VIEW MORE
story-6
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Slideshow: How to Protect A Convertible Top: 10 DOs & DON'Ts

By Michael S. Palmer | 2026-04-03 00:00:00


VIEW MORE
story-7
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

Slideshow: The 10 most explosive Corvettes ever built based on power-to-weight ratio.

By Joe Kucinski | 2026-05-20 07:23:03


VIEW MORE
story-8
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-9
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE