JCD:

Your fuel tank is located in the trunk behind a metal panel. The fuel sending unit can be R&R'd by removing the metal panel that hides the fuel tank (clean out trunk, 4 - 9 or 10mm head screws hold panel in place), then remove first aid kit and the plastic tray the first aid kit sits in (2 phillips head screws), then remove the electrical connection to the fuel sending unit, then un-screw fuel sending unit using large pair of Channel Locks (or similar tool, tight space), then pull the sending unit out through the space where the first aid kit is located letting it drain before completely removing from fuel tank. Take the sending unit apart and look for crud and build-up interfering with contact for the float to wires and look in the sending unit tube for crud/build-up also - clean everything being careful with delicate wires. Or, you may find something broken/cracked (wires, float, etc.), then replacement is the only option - about $90-$100 for a new one. When installing be careful that the sending unit's sealing o-ring is in good condition (I re-used mine with no leaks). The fuel gauge bouncing around is a common problem, you may also need to check the elec. connection at the gauge in the instrument cluster for corrosion and good contact.

Good Luck!
Tom

__________________
America: Land of the Free!

1977 300D: 300,000+ miles

American Honda: Factory Trained Technician & Honor Grad.
Formerly:
Shop Foreman;
Technical Advisor to Am. Honda;
Supervisor of Maintenance largest tree care co. in US for offices in Tex.