it would get noisy and draw more current yep.

as said above, check the breather on the tank, it comes off the top of the tank somewhere and looks like a little plastic pipe with a funnel on the end - it will be routed round the top of the tank to the left side (near the fuel pump cradle) for the ventilation, also if its a late 4x4 with a cat, it will have a charcoal canister on the inner wing with a vapour line going to the tank, check that the solenoid here is operating for the vapour