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11-14-2017, 12:31 AM | #1 |
Registered User
Join Date: Apr 2009
Location: Lowell AR
Posts: 360
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I serviced the evaporator canister on my 72
My evaporator canister did not have any carbon chips in it anymore, I could see the carbon chips under the battery tray where they had come out. The canister had a filter at the bottom that was worn out. I took the valve apart on the top,Just pop the top off. I rinsed the canister out with the water hose and blew air through the passages. I put the valve back together and put vacuum on it and it held vacuum. I went to Walmart and bought activated carbon chips in the pet supply dept. Next to it was a filter I got to make my bottom filter. I cut the filter apart and used the plastic screen to help keep the chips in and help hold the filter. I put in all of the nine oz of chips.
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http://67-72chevytrucks.com/vboard/s...d.php?t=698292 |
11-14-2017, 07:07 AM | #2 |
Senior Member
Join Date: Jun 2014
Location: Bushwood, MD
Posts: 510
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Re: I serviced the evaporator canister on my 72
Very nice work! Thanks for sharing!
Randy |
11-14-2017, 12:50 PM | #3 |
Senior Member
Join Date: Feb 2009
Location: Northern Nevada
Posts: 7,290
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Re: I serviced the evaporator canister on my 72
The reason they lose charcoal is the thin spongy element on the floor inside the canister wears out. There's one on the ceiling as well, but they don't wear out like the bottom, obviously.
Looks like you're going to run without the bottom element. Nice mod, seems it would work, I may try it. Currently the plan is to use my best canister, which has a slow leak. I picked up a Standard (white) filter, and it's stiffer than common, so it will retain spill more better. I'm adding a funnel, which should add to some longevity. At some point I may rebuild my other can, but "you have" to cut it open...........Shame someone doesn't build replacements. I'd think there would be a market. GM trucks and passenger cars used the same can.
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Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assembly kit for restoring the (a) truck from the ground up. My build thread, and more on the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025 |
11-14-2017, 01:50 PM | #4 |
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Join Date: Jun 2017
Location: Santa Ana, CA
Posts: 22
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Re: I serviced the evaporator canister on my 72
Does the vehicle even need this filter? I only ask because when I replaced the battery tray on my truck I noticed that the filter has been cut out. There were just 2 hoses stuck in the spot where the filter would sit. Thanks, previous owner. LOL
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11-14-2017, 04:23 PM | #5 | |
Who Changed This?
Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,575
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Re: I serviced the evaporator canister on my 72
Quote:
https://www.summitracing.com/parts/a...SABEgLqEPD_BwE
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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11-14-2017, 09:17 PM | #6 |
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Join Date: May 2008
Location: Woodlawn, TN
Posts: 275
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Re: I serviced the evaporator canister on my 72
I built an evap system out of an old external oil filter system. Both tanks vent into one line which leads to the down tube which goes straight to the bottom of the canister into a bed of steel wool. Using a toilet paper roll in the middle where the tube sits, I filled around it with activated charcoal with another layer of steel wool on the top and put the cap back on. I installed a tee on the outlet and capped it with a small breather element. I ran the other portion of the tee to the breather hole on the valve cover. This system is much like Chryler's early system and I could make it more elaborate to seal it to open at a certain engine temp, &c., but I was mostly concerned about containing some or most of the fumes and using an unvented gas cap that won't spill whenever I turn right.
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Rocinante: 1972 GMC C25, 292, SM465, 14 bolt, power nothing, 440k and still handles my PCS moves Jorge: Kia Roller-skate with lots of buttons for the wife Wovoka: 2017 Indian Chief Vintage, better on gas but not much So far, this is the oldest I've ever been. |
11-15-2017, 12:25 PM | #7 |
Registered User
Join Date: Jun 2017
Location: Santa Ana, CA
Posts: 22
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Re: I serviced the evaporator canister on my 72
Good times. Thanks for the link, Steeveedee.
I only have 2 lines going over in that direction. One from the fuel tank and one to the carb. Nothing better than cleaning up someone else's stupidity. LOL |
11-15-2017, 01:41 PM | #8 | |
Senior Member
Join Date: Feb 2009
Location: Northern Nevada
Posts: 7,290
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Re: I serviced the evaporator canister on my 72
Quote:
I wonder if the canister per Steevee's link has these ports and fits with the existing bracket?
__________________
Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assembly kit for restoring the (a) truck from the ground up. My build thread, and more on the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025 |
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