Ever since the cold weather arrived, I've started leaking fuel from the fuel line connections at the float bowl nipple connections. Dual SU's totally rebuilt, all new fuel lines with stainless braiding and new clamps.

It first happened after a cold night. When I arrived at work, I smelled fuel and saw that gas was dripping out of all 3 nipple connections (the main line connection, and the connector line between float bowls. I tightened all three clamps and it was fine for a day or so. Then, after the next slightly colder night the same thing happened. This time I replaced the lines, and put on new clamps. Now, this morning, after an even colder night, I get to work again with the same issue, fuel out of all three clamp points. I know it isn't the bowl gaskets, because the gas is on top of the float bowls. Gaskets are also brand new. I did remove the caps to check that nothing was amiss with the floats.

Is this a common problem when things get cold? This morning it was below freezing. I am using standard screw tightening hose clamps, are these the wrong types? I've never had these issues when warm, but now have the lines squeezed so tight, I'm amazed they still leak.

Any ideas?