Fuel Sending Unit 240-33 ohms 6ft Marine Fuel Gauge Sender - Durable

Our review of this fuel sending unit finds it best suited for boat and vehicle owners who need a durable, direct replacement for arm type senders. The single biggest reason to buy is reliability: the unit uses an OKI reed switch imported from Japan and stainless steel construction, which removes vulnerable moving electronics and reduces the need for later adjustment. For anyone who values long term durability and straightforward installation, this sender delivers accurate readings with minimal fuss.

Key Features

• Reed switch construction: The OKI reed switch offers superior durability and reliability compared with thick-film swim arm designs, reducing failure from wear.
• Standard output: The unit uses the American standard 240-33 ohms output so it works with most fuel and water gauges without custom calibration.
• Stainless steel build: Heavy duty 316 stainless steel and rugged construction give corrosion resistance suitable for marine and automotive environments.
• Easy installation: It ships with a gasket, mounting screws and illustrated instructions so installation is straightforward for DIYers and technicians alike.
• Multiple lengths available: Stock lengths cover 4 in to 32 in and the maker offers custom lengths on request for different tank depths.
• Mounting pattern: SAE 5 hole mounting pattern ensures compatibility with common tanks and replacement scenarios.

Who It's For

This sender is aimed at boat owners, RV owners and vehicle owners replacing arm type fuel or water level senders who want a longer lived, low maintenance solution. It is particularly useful for installations where the unit must resist corrosion and where accurate, consistent readings are required for mid to large tanks.

Those who should look elsewhere are buyers who need an exact nonstandard output or a float diameter much larger than 1.38 in; also, if you cannot measure tank depth precisely to avoid the sender hitting the bottom, professional fitting may be preferable.

Pros & Cons

Pros

• Durable reed switch design reduces moving parts and long term failure risk.
• Solid 316 stainless steel construction resists corrosion in marine environments.
• Accurate 240-33 ohm output integrates with standard gauges for reliable readings.
• Comes with gasket, screws and clear instructions for straightforward installation.

Cons

• Requires careful measurement so the sender does not hit the tank bottom; install guidance suggests subtracting 1 in from outside tank depth.
• Float diameter is 1.38 in which may require drilling a 1.5 in hole if retrofitting different tanks.

Specifications

Our Verdict

The fuel sending unit is a practical, cost effective replacement for arm type senders where durability and reliability matter. With a Japanese OKI reed switch, 316 stainless construction and standard 240-33 ohm output, it fits most marine and vehicle gauge systems and represents good value for owners who prefer a low maintenance, long lasting sensor.

Frequently Asked Questions

Will this fit my existing gauge?
Yes, it uses the American standard 240-33 ohm output which is compatible with most fuel and water gauges that accept that range.

Do I need to adjust the unit for my tank?
No adjustment for the tank is needed, but measure tank depth and subtract 1 in from the outside depth to avoid the sender hitting the bottom.

What if I need a different length?
The manufacturer offers lengths from 4 in to 32 in and can provide other lengths if you contact them directly.