[hatzie]

Originally Posted by 68c10owner

Thanks,great Info here. If I stick with the saddle tanks I will change them to the 1987 TBI tanks but I am also considering a blazer tank conversion. My main issue is making everything smog legal. I know they need a vapor pressure sensor or something like that. Figured swapping to a single tank would make things easier. The swb saddles are only 16 gallons each so I wouldn't be losing too much and rarely filled both tanks in previous trucks.

The fuel tank pressure sensor is just like an old fashioned MAF sensor. You need a bung that it'll fit through tightly.

The rest of the LS version of the EVAP system is fairly simple. If you weren't in the Peoples Republic of California you could bypass the EVAP readiness test and plumb the less expensive components from the 1970's evap canister setup to the purge valve. It would work just as well as the LS system but your overlords have no doubt decreed you shall use the LS motor evap system or else... off with your head...