DIY CO2 in 90 gal.

I'd really like to set up a fully automated CO2 system but can't afford it yet.
in the meantime, I'm thinking about trying the yeast/sugar water setup just to
play around.  I'd like to bubble the CO2 into my canister filter intake
(Fluval 403), but I'm concerned about the depth of my tank.  My intake is
close to 18 inches under water.  Will the DIY setup produce sufficient
pressure?  Thanks in advance.
Mark A. Thompson - rrs0062 at ibm_net