Fuel tank sending unit ground strap

The rubber sealing gasket alone with the rubber hose section completely isolates the sender from chassis ground. If the contact of the sender retaining ring through tank, straps, hardware, was sufficient and dependable the mfgr would never have put the jumper on the fuel line. Yes it will work at times but rain, vibration, even changes in fuel weight, causes more posts here about intermittent gauge operation.