ECN Forum Forums General Topics of the Trade General Discussion Area No juice in outdoor GFCI installation

I recently installed an underground conduit (110VAC)underground and tested fine on the GFCI. After a week, there was no juice and GFCI failed test. Outlets I tapped into from the side of the house are also dead. Nothing tripped. DVM shows nothing across hot to neutral, but about .3VAC across hot to ground. This outlet is at the end of a loop. Any help is appreciated.