[catback23]

what he means by "unit a whole" aka "whole unit" is the fuel sending unit with the fuel pump already attached. Often times the fuel sending unit is sold with the new pump already attached and it costs more than the units that don't have a pump included. The thinking is if your pump is good why pay to replace it if you don't have to.

If your not comfortable dropping the tank then you should take it to your mechanic, it's no small task and if your not prepped and ready to do it just leave it for someone who is better equipped to do the job.

Filling the tank to fix the problem usually means dislodging a stuck float level by filling the tank above the level the float is stuck at. The float will be under more pressure to lift up and dislodge and typical bumps in the road will typically jar it loose.

Hope this helps, good luck with the car.