In cab gas tank question

[Stocker]

Originally Posted by dagnabbitt

To complicate matters, 3/4 and 1 ton trucks do not seem to have made the change to EEC. Possibly because whatever laws that GM were abiding by for the half tons they were able to sidestep for those "heavy duty" vehicles: I don't think that evaporative cannisters were standard on them.

http://67-72chevytrucks.com/vboard/s...d.php?t=645283

Yep. My K20 is a Fremont-built California truck with non-EEC tank and no evap (charcoal?) canister.

[dagnabbitt]

Originally Posted by Stocker

Yep. My K20 is a Fremont-built California truck with non-EEC tank and no evap (charcoal?) canister.

Buying a gas cap for my 72 GMC 2500 was a really confusing experience until I found this out.

[mr.mud1]

my 72 big block C-20,Fremont built truck has no evap canister or a EEC vented tank.there are 3 ports on the fuel pump,3/8's fuel in,3/8's fuel to the carb and a small 1/4 i believe return hose to the sender.