I have a used monitor 21 I just picked up. It was set up for an external tank. I hooked the copper fuel pipe back to itself,heres where i get confused. The manual says to hook the red and bround wire marked U on the circuit board togethe to activate the float. It already is,I put the capsule in and it overflowed,what a mess. What do I do? kdstevens10@gmail.com