huayi carb

hi there, i bought a honda 400 about 4 years ago. it had a huayi carb on it . it started working bad a while ago and the guy i bought it from told me to take it back to princess auto where he bought it . they gave me a new one. this one has something on the bottom hooked to the fuel bowl with 2 wires coming out of it. Where do they go and what is it
Thanks "Chuck"