Fuel gauge ground!?

The gas gauge aint working...im considering it might be the ground I've herd around...

Well here is a picture of it...there is the sender hose with the rubber hose and one clamp and a metal long clip which im guessing is the ground...and then there is the wire next to the outlet.

Well I have no idea how it is being grouded by that clip...is there something missing here? does that clip need to touch a ground on the actuall car? or touch the clamp on the rubber hose? or is it fine as is...just needs cleaning?