Fuel Level Indicators

Electrical Fuel Level Indicators

S3 Fuel SenderTek-Tanks electrical fuel senders and gauges are fitted as original equipment by most major UK boat builders. Made from a stainless steel head assembly with a stainless steel tube, they are reliable and easy to install. A float, holding twin magnets, rises and falls with the fuel level and triggers a series of electronic switches housed and sealed within the tube.

The system is simple and with no mechanical moving parts to wear, it is very durable and can withstand the constant movement of the contents much better than the ‘car type’ floating arm sender.

The sender head has a 1 1/4″ BSP male thread, with double ‘O’ rings for an efficient seal. We offer a series of fitting flanges to suit most situations.
The sender is supplied to suit the depth of the tank and is calibrated during manufacture. Fitting is as easy as screwing in the sender and joining two wires to the gauge. At extra cost, we can supply senders to trigger any type of gauge, or have special calibration for heavily shaped tanks. As standard we keep senders in stock ranging from 200mm to 600mm in 50mm increments. Specials can be ordered but will take about 10 days to supply.

Tek-Tanks fuel senders can also be used to switch a pump on and off if used with a relay block designed specifically for the purpose, ideal for automatically filling your day tank. Please phone for more details.

Gauge to suit fuel senders is shown below, and is also available in a seven step LED format ideally suited for RIBS.

To see how easy it is to fit one please visit

Fuel S1For a twin tank installation that has isolated tanks and the contents of each tank need to be read separately, then a dual panel is available which uses a common gauge and a simple switch which is normally off but can be switched to read the contents of each individual tank. Please phone for more details.


Mechanical Fuel Level Indicators

The Tank-Check vertical spiral gauge is a mechanically operated liquid level gauge. The gauge is of rugged construction and is designed to be fitted onto the top surface of a tank with an
1 ½” BSPT (loose fit) thread. As it is a purely mechanical gauge and has no electrical input, it can be used in applications where flammable liquids such as petrol and diesel are present.

Our 1 1/2″ BSP black acetyl fitting flange is suitable for the Tank-Check range of universal mechanical senders. Supplied with 8 off stainless steel M5 x 20 button head screws and gasket. Allow 50mm above tank top for clearance, including the sender, flange and gasket. Tek-Tanks keeps a range in stock from 200 – 600mm in 50mm increments. Custom lengths are available upon request.

Fozmula fitting flange:

Diameter 86mm
Height 18mm


Technical Data Sheet