EMIHO Fuel Level Sending Unit 240–33Ω 8" (200mm) Stainless Steel Stem IP67 for Marine & Trucks

EMIHO's 240–33Ω stainless steel fuel level sending unit is a sealed SAE 5-hole float sensor that reports tank level for marine, truck and car applications.

This compact fuel/gas sender combines a corrosion-resistant SUS316 body, NBR float and PVC wiring to deliver reliable level readings in harsh environments. It uses the American-standard 240–33 ohm output so it plugs into most legacy gauges and monitoring systems, and the IP67 rating protects electronics from water and dust. Choose the correct stem length for your tank — 200 mm (8"), 225 mm (9"), 250 mm (10") or 275 mm (11") — and note the ~21 mm resolution for level changes.

How does this sender measure fuel level reliably on boats and trucks?

The unit uses a pivoting NBR float on a precision travel that varies resistance between 240 and 33 ohms. Its SUS316 stem and sealed electronics resist corrosion and vibration, keeping readings stable in marine and road environments.

• SUS316 stainless steel stem resists saltwater corrosion
• IP67-rated housing shields the potentiometer and wiring
• NBR float tolerates fuel and water exposure
• Resolution ~21 mm for consistent level steps

Which length should I pick for my fuel tank?

Select the sending unit length so the float travels most of the tank depth without bottoming out. For plastic tanks, choose a stem 1" (≈25 mm) shorter than the tank depth; for metal tanks, choose about 0.5" (≈12 mm) shorter.

• Available lengths: 200 mm (8"), 225 mm (9"), 250 mm (10"), 275 mm (11")
• Plastic tanks: choose stem ≈25 mm shorter than depth
• Metal tanks: select stem ≈12 mm shorter than depth
• 21 mm resolution indicates incremental level steps

Will it work with my existing gauge and how is it wired?

The sender outputs the American standard 240–33 ohm signal, compatible with most analog gauge inputs designed for that range. Wiring is straightforward with the provided color-coded leads and standard SAE 5-hole mounting pattern.

• Output: 240–33 ohm (American standard)
• Mounting: Standard SAE 5-hole pattern—fits common panels
• Wiring: red-brown positive lead, blue negative lead for easy connection
• Includes 2 mm NBR gasket and five M5 mounting screws

How durable is the sender in real-world conditions?

Materials and construction are chosen to withstand vibration, moisture and fuel exposure encountered in boats, trucks and off-road vehicles. The IP67 rating and heavy-duty stainless steel stem provide long service life when installed correctly.

• SUS316 stainless steel for strength and corrosion resistance
• IP67 protection against dust and temporary immersion
• Anti-vibration design suitable for engine compartments and hulls
• Supplied gasket and screws reduce risk of leaks at mounting flange

Who is this for: Technicians, boat owners, fleet managers and DIY mechanics who need a drop-in, durable fuel level sending unit that matches American 240–33Ω gauges. It’s especially useful where corrosion resistance and waterproofing matter — saltwater boats, diesel trucks and outdoor equipment. If you require a different output range or a custom stem length, confirm compatibility before ordering. Installation is straightforward for anyone comfortable with basic electrical wiring and standard SAE flange hardware.