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Re: 72 K5 EFI upgrade & evap canister woes
Quote:
Originally Posted by TheKorndog
I am not sure that it would pressurize with a vented cap, but that's where I get hazy on this part. I will have to pick up a new canister, as I do not have that.
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If working on a 72 model K/5 (per your thread title) the fuel fill cap should be a pressure vacuum (non-vented) gas cap, by design the tank doesn't vent through the filler cap in 72 on the blazers. If needing a correct 1972 fill cap, we have some 72 specific GM NOS stainless double ring "pressure vacuum" gas caps available in the below linked parts board f/s thread, am pretty sure that we have a 72 vapor canister and mounting bracket setup pulled ready to ship also. Have a look and let us know, Mel 
http://67-72chevytrucks.com/vboard/s...d.php?t=837726
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