what to do w the black box?

i have a 99 s10 n next 2 the gas tank is the black box....charcoal canister i guess.....how do you cap it off w.out setting off the c.e.l?....thanks in advance

dont cap it off..
just move it over out of the way

weld it to the gas tank crossmember going toward the front of the bed, easy to bend the fuel line around to it, and out of the way.