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Mechanical Fuel Gauge (Float Level Indicator) – 220 mm to 370 mm
This mechanical fuel gauge offers a simple and dependable way to monitor your boat’s fuel level without any electrical power. It consists of a float attached to a rod and a top-mounted dial. As the fuel level changes, the float moves up or down, turning a connected pointer on the dial to show the approximate amount of fuel (from “E” for empty to “F” for full). The reading is instantaneous and doesn’t rely on batteries or sensors – a convenient solution for smaller vessels or as a backup gauge.
The gauge comes in several different lengths (from 220 mm up to 370 mm) to match the depth of your fuel tank. You should choose a model with a length close to the internal height of your tank – the float should sit near the bottom when the tank is empty and have room to rise when it’s full. The 220, 265, 285, and 370 mm versions cover a wide range of standard fuel tank sizes (roughly ~25 L to ~200 L capacity, depending on tank shape). The mechanism is universal and can be used in both gasoline and diesel tanks.
Installation is straightforward – all necessary screws and a sealing gasket are included. You’ll need an opening of about 60 mm diameter on the top of the tank to insert the gauge. Insert the unit so the float goes into the tank, align the flange (external diameter ~66.5 mm) on the tank surface with the gasket in between, and screw it down evenly to ensure a good seal and stable fit. Once installed, the needle immediately indicates the level – you can test it by gently moving the float (if accessible) or by comparing with the known fuel quantity in the tank.
The construction is fuel-resistant: the float and rod are typically made from materials that withstand prolonged immersion in petrol or diesel, and the upper cap/dial is crafted from a durable polymer or aluminum. This ensures a long service life and consistent accuracy. The mechanical gauge has no electrical components and thus no risk of sparks, making it safe for use in flammable fuel environments. With proper installation and use, it will provide reliable service, keeping you informed of your remaining fuel – extremely useful for planning refuels during long voyages.
