An accurate fuel tank sender will allow the operator of the vessel to safely monitor the vessels fuel level(s). When properly installed and maintained a good sender will allow for proper trip planning and safe return to port.
Different boats may have different fuel tanks. The rate at which the level of fuel drops in the tank is directly dependent on the tanks design and the engine(s) fuel consumption. A non-rectangular or irregular shaped tank may cause the surface level of the fuel to drop faster as the fuel level approaches lower levels. These facts need to be taken into consideration before and after the sender installation and use of vessel. It is best to install a fuel tank sender as so to leave a "reserve" or extra amount of fuel in the the fuel tank after the fuel gauge level reads "Zero" or "Empty".
Your vessels running position and ride can cause your fuel gauge to vary in its reading. For example, if your boats bow rides high this can raise the surface level of the fuel in the aft area of your fuel tank. Also, boats that bounce around a lot may experience erratic fuel gauge readings. It is up to the operator or captain of the vessel to understand these variations in the fuel sender and gauge readings as to insure safe vessel operation.
Common sense dictates that testing and recording be performed after the installation of your new fuel tank sender assembly. Filling the fuel tank while the boat is level in the water in small gallon increments will give you a good idea as to how your fuel gauge will read. Record your results in your ships papers and educate all operators and onboard guests of the boats fuel characteristics and limitations.
Please take some time to select the correct sender assembly for your vessels application. Know your brand and type of fuel gauge. Measure your tanks depth carefully and take your tanks design, shape, material and accessability into consideration.
Use EXTREME CARE to prevent fuel spillage or build up of fuel vapors in your bilge. Fuel is very dangerous and one small spark or flame can cause a fire and/or explosion. Fuel vapors or liquid can cause fire, explosion, damage, injury or death. Never remove a fuel sender if your fuel tank is full or near full as fuel can poor out the top of your tank. Always disconnect and/or remove your battery(s) and all voltage sources from the vessel BEFORE working on your fuel system. Do not expose any fuel if your engine is hot. Work in a well ventilated area as liquid fuel and/or fuel vapors can cause medical problems and/or death. Avoid contact with fuel and wash with soap and water as soon as possible to prevent injury or illness. Bottom line.... Safety Comes First!