EMIHO 9" (225mm) Fuel Level Sending Unit 240–33Ω SAE 5-Hole Stainless Steel IP67 NBR Float

EMIHO's 9" (225mm) stainless steel fuel level sending unit is a 240–33Ω SAE 5-hole sensor designed to accurately report liquid level in marine, truck, and automotive tanks.

This compact sending unit combines 316 stainless steel durability with an IP67 housing and an NBR float to withstand wet environments and vibration. It uses the American-standard 240–33 ohm output so it plugs into most classic fuel and water gauge systems, and its 21mm resolution gives reliable step changes across the sensor travel. Choose the correct stem length for your tank — this listing covers the 9" (225mm) option — and follow the included gasket, screws, and wiring guide for a straightforward installation.

How does this sending unit connect to my existing gauge?

The sensor uses the common 240–33Ω output curve, compatible with many legacy and OEM gauges. Wiring is simple: red-brown for positive (signal) and blue for negative (ground). The standard SAE 5-hole mounting pattern fits most existing flange openings, minimizing modification.

• Output: American standard 240–33 ohms for gauge compatibility
• Wires: red-brown (positive/signal), blue (negative/ground)
• Mounting: standard SAE 5-hole pattern with included M5 screws
• Included gasket: 2mm NBR to seal flange surfaces

Will the sensor survive marine or rough-duty use?

Yes — the stem and body are fabricated from SUS316 stainless steel for corrosion resistance in saltwater and harsh environments. The unit is rated IP67 for dust-tight protection and temporary immersion, and the construction resists vibration and impact common in boats and trucks.

• Material: SUS316 stainless steel for corrosion resistance
• Protection: IP67 dust and water resistance
• Float: NBR for chemical resistance to fuel and water
• Operational range: -40°C to 85°C suitable for varied climates

What dimensions and resolution should I pick for my tank?

This model is the 9" (225mm) stem length; EMIHO also offers 200mm, 250mm, and 275mm variants to match different tank depths. For plastic tanks, choose a sender about 1" shorter than the tank depth; for metal tanks, select roughly 0.5" shorter. The sensor's resolution is 21mm, meaning discrete level steps are read approximately every 21mm of travel.

• Listed length: 9" (225mm) stem
• Other lengths available: 8" (200mm), 10" (250mm), 11" (275mm)
• Resolution: 21mm per detectable step
• Installation tip: allow 0.5"–1" clearance depending on tank material

What comes in the box and what tools are needed?

The sensor ships with everything required for flange installation and basic wiring: the level sensor, a 2mm NBR gasket, five M5 mounting screws, and installation instructions. Typical installation requires a screwdriver or small socket for the M5 screws and basic hand tools for routing and securing the wires to your gauge or harness.

• Packing list: level sensor, 2mm NBR gasket, 5× M5 screws, instructions
• Tools: screwdriver or M5 socket, wire crimpers, dielectric grease recommended
• Mounting hole: standard SAE 5-hole pattern; no custom flange required
• Support: contact EMIHO by email for questions or returns

Who is this for: technicians, boat owners, fleet managers, and DIY mechanics who need a rugged, drop-in 240–33Ω fuel or water level sender that fits standard SAE 5-hole flanges. If you operate in marine, trucking, or automotive environments and require corrosion-resistant materials, IP67 protection, and a proven output curve for legacy gauges, the EMIHO 9" (225mm) stainless steel sending unit is a practical, serviceable choice.