Best Fuel Sending Unit for Boat: (Top 7 Picks In 2021)

You may not think it’s important, but choosing a high-quality fuel sender is crucial.

Whether you’re looking to replace your old one or buy a new one, this blog post will give you an overview of the seven best fuel sending units for boats currently available.

You can learn how they work and what their most valuable features are so you can find the right one for you.

Best Fuel Sending Unit for Boat

7 Best Fuel Sending Units For Boat:

Here are the in-depth review of top 7 fuel sanding unit you can use on your boat. So, without delay start your journey to select the right one.

1. Moeller Marine Fuel Tank Sending Units

Our first choice is the Moeller Marine Fuel Tank Sending Units. 

The calibrated resistance of this tank is 33-240 ohms, making it suitable for any boat or other marine vehicle powered by gasoline.

The stainless steel design of the internal components ensures that they will not rust or corrode.

Having a dash-mounted gauge with this sending unit is necessary to mount it on the tank.

The tank’s float arm is adjustable by turning the screw assembly in 90-degree increments until the probe clears the tank wall. As well as gaskets and screws, it comes with a complete kit.

Approximately four inches to 28 inches is the depth range of the tank.

The Moeller Marine Fuel Tank Sending Units are an excellent choice for boats with gasoline engines because they have a calibrated industry standard.

The internal components will not rust. There is an adjustable float arm that can be adjusted until the probe clears the tank wall.

Pros

  • Industry calibration standards.
  • For use at various tank depths, it has an adjustable float arm.
  • There will be no rusting of internal components.

Cons

  • The boat/ship/vehicle’s fuel level is measured with a dash-mounted gauge.
  • Sending units need to be connected to an accurate gauge mounted on the dashboard to function correctly.

2. Seachoice Gas or Diesel Marine Fuel Electric Sending Unit Kit

An excellent product to consider is the Seachoice Gas or Diesel Marine Fuel Electric Sending Unit Kit.

In addition to its standard 5-hole pattern, it has not evenly spread holes, allowing only one installation method.

There are 247 ohms in the empty state and 30 ohms in the entire state. An installation guide is provided with the product, making the process very simple.

Water cannot enter your tank because this product is equipped with an internal diaphragm that keeps liquid out of your electrical system, preventing any damage or corrosion.

It is made mainly out of metal, making it a very durable product. An excellent design prevents the product from easily breaking.

This product works well on pretty much any boat, whether it’s a bass boat, fishing boat, wave runner, pontoon, or deck boat.

You can install the product on your boat yourself without any assistance. Installing the fuel sending unit is an easy one-person job.

Despite being exposed to saltwater, this product will last for many years without breaking apart or corroding. 

In addition to mounting instructions, the fuel level sensor includes diagrams of the electrical wiring system in your fuel tank.

Pros

  • Providing numerous benefits, this product is excellent.
  • It is easy to install without any help, and the process is not complicated at all.
  • No matter what type of boat it is, this product will work.
  • Seawater will not damage this unit for a very long time, thanks to its corrosion-resistant design.

Cons

  • Nothing.

3. AODITECK Fuel Sending Unit Marine for Boat

Next, there is the AODITECK Fuel Sending Unit, which is ideal for boats. It is marketed to replace the swingarm sender, but you can also use it with the Werner and Wema brands.

There are no tubes needed with this unit, as it is doughnut float designed.

With this type of level sender, you get the best of both worlds: reliability and durability from a Reed switch and easy installation and operation like swim arm types.

A gasket, mounting screws, and a gasket are also included. Instructions are well-written and illustrated, so installation should be straightforward.

Easy-to-follow wiring instructions make this product easy to install. After about 15 minutes of troubleshooting this fuel sending unit, a fuel gauge will be back in working order.

AODITECK Fuel Sending Unit Marine for Boats features a SAE five-hole mounting pattern, heavy-duty 316 stainless steel construction, and a doughnut float level indicator.

Pros

  • There is a shaft made of stainless steel, which is a durable material.
  • Installing this product was a breeze.
  • No issues were encountered when lining up the gaskets and holes. 
  • It has a very efficient floating system that is very easy to use.

Cons

  • Its reading will fluctuate from 1/4 to 3/4 when the water sloshes in the tank. 

4. Dorman Universal Fuel Level Sending Unit Kit

The Dorman Universal Fuel Level Sending Unit kit is a quick and easy replacement. This gas tank sending unit is among the most affordable we could find.

It took less than 20 minutes to install this gas tank kit, so it’s an ideal replacement option for people who can’t do a complete gas tank replacement.

With this gas tank kit, you get everything you need for a quick and easy installation. The high rating on Amazon indicates that previous users had success with this product.

Dorman offers a 1-year warranty on this gas gauge sending unit, which means they will replace or refund the product if anything goes wrong within that period.

It worked very well with our gas tank, and we were delighted.

The kit includes connectors for both the swing arm sender and the ignition switch, and the correct length of wire nuts to connect those electrical connections.

Pros

  • This sending unit is easy to install.
  • Flexibility allows for 8.5″ depth to be secured.
  • This sender’s accuracy and sturdiness make this sender superior to others.
  • A thick and flexible rubber gasket is included, so no compound will be necessary to seal the leak. 

Cons

  • For this to fit in your tank, you will need to have quite a bit of space.
  • Setting the set screw tight enough to hold the float firmly is difficult.

5. Moeller Marine Electrical Reed Switch Fuel Sending Unit

Our next device is the Reed Switch Fuel Sending Unit made by Moeller Marine Electrical. Amazon.com lists it as one of the bestsellers.

This is an excellent option for boat owners with larger tanks and who need to know how much fuel they carry on board.

As a result of its stainless steel construction, the product is highly efficient in terms of performance and reliability when collecting fuel consumption information more consistently than swing arm senders.

You receive fuel measurements from the float and display them on your electronic display. With its sender length being one inch shorter than tank depth, it fits perfectly into most boats.

Also included is the 33-240 Ohms industry-standard calibration, which you can calibrate yourself or take to an expert to do.

Compared with other fuel gauges on this list, this is one of the most commonly used by boat owners. It provides a very accurate reading, making it a wise choice if accuracy is what you’re looking for in a fuel gauge.

It is imperative to take into account the depth of the tank. The fuel tank sending unit is made of high-quality stainless steel and should last for a long time.

Additionally, it includes two sets of screws that you can insert into the hole in the tank. Both the depth and size of the tank are necessary. Don’t forget to measure it before ordering.

The set includes six screws, but depending on the depth and size of the tank, one set may not fit.

When ordering a fuel tank sending unit for your boat’s fuel tank, there are a lot of factors to consider.

Pros

  • Made mainly from stainless steel, this part is of high quality.
  • On the top of the unit, the electrical wires are well sealed.
  • Installation is simple.
  • Two sets of six screws come with it, and one set goes right into the tank’s screw holes.
  • Additionally, the rubber gasket comes with it.

Cons

  • At the mounting plate, the sending unit measures only 2 3/4 inches in diameter.
  • Occasionally, it shows full underway and changes to 1/4 to 3/4 when drifting.

6. ITYAGUY Fuel Gas Sender Stainless Steel Fuel Sending Unit

ITYAGUY has been producing above-full and above-empty readings, as well as tubes with floats, for more than 20 years.

Fuel gas senders feature high-quality material, a signal output of 0-190 ohms or 230-33 ohms, easy installation, and a suitable length range (150mm-500mm).

A stainless steel tube floats in a stainless steel tube at the top of the full/empty gauge pictured above.

In addition to gas, diesel, and oil applications, you can also use the above gauge for measuring full and empty levels.

The fuel level sender is constructed of durable and long-lasting 316 stainless steel. Besides providing anti-vibration, anti-explosion functions, it also keeps you safe from explosions.

With blue wire to earth (-), and brown wire to the instrument signal wire, this fuel level sender fits into standard SAE 5 hole patterns.

In addition to this, fuel gas senders are widely used in industries such as electronics, motorcycles, or others that require fuel monitoring systems.

Pros

  • The quality is excellent.
  • Installation is simple, and the support plate is firm.
  • No problem using different bolts.
  • The readings from this unit are more accurate.

Cons

  • There are no wiring instructions.
  • There is some instability in the resistance values measured. 

7. Seachoice Marine Fuel Electric Sending Unit

A swing arm float provides tank walls or baffles clearance and can be rotated in 90-degree intervals on the Seachoice Marine Fuel Electric Sending Unit.

With mounting screws and gaskets included, this non-ferrous boat fuel sending unit matches gauges ranging from 35 to 240 ohms.

Seachoice is dedicated to providing quality marine accessories and OEM replacement parts to fishing, boating, and water sports enthusiasts worldwide.

With a wide range of products tailored specifically for the boating industry, Seachoice is run for and by boat owners.

The arm with contact points is connected to the non-contact sender. Since it has an ignition circuit that you can adjust to 35-240 ohms, it would work with any gauge on the market without changing anything.

This unit only has one downside: the wiring isn’t really up to snuff. I would recommend upgrading other wiring in your boat before installing this one. This is because if you don’t, your wires will probably corrode and stop working within a year or two.

Pros

  • With minimal modifications, the fuel level sender fits just like an original and works just as well.
  • The installation process is simple.
  • Fair pricing.

Cons

  • The wiring isn’t really up to snuff.

How To Choose The Right Fuel Sending Unit For Boat?

Fuel sending units aren’t something you want to buy every day. Thus, when considering an investment of this kind, it is imperative to consider certain factors. Here are some of them:

First Know What Is A Fuel Sending Unit On Boat?

The fuel sending unit measures the level of fuel in your boat’s tank.

The sender is typically made up of a float and some wires connected to the gauge on top of the fuel tank. This allows electricity to flow through and turn on lights inside the fuel gauge when gas is present. 

The float drops with a running tank, preventing power from getting through it to your fuel level indicator.

It consists of an electrical sensor that measures how high up the gas sender is positioned in the boat’s gas tank. In addition, it has a magnetic rod that is attached to the fuel tank.

As your fuel tank runs out of gas, the fuel level falls, and the circuit is broken, preventing electricity from flowing.

The application

One of the most pertinent things to consider is how the fuel sending unit will be used.

Depending on the application, you need to determine whether an extra wire is needed for reading purposes or any special requirements for the product.

Choosing a Placement

When purchasing your brand-new fuel sender, you should also consider where you will install it on your vessel.

A side-mounted model is the better option when you have enough space above the tank since they usually provide more accurate readings than bottom-mounted models.

The Reading

You should also consider whether you will need to read fuel levels on your new unit or if there are already wires running to it.

To ensure that all the fuel will fit into your tank, make sure you read the fuel levels.

The Wiring

Furthermore, if you need a wire running from the sending unit to your boat’s gas tank due to a lack of space, this can significantly affect the reading accuracy of your new fuel sender.

Wireless readings do not pose a problem, and instead of reading an analog value, it would be more accurate to read digital values via Bluetooth or WiFi signals.

The range of the signal

Identifying the fuel level reading range of the fuel sender is also significant. Most of the time, it is from zero fuel to maximum capacity in a tank or from empty to full.

It would be best to match the fuel sender with the gauge’s dash-mounted receiving signal for accurate fuel gauge readings and proper function.

Those purchasing fuel level senders should also know about the different methods used. Floats, variable resistance, and strain gauges are among the most common methods.

Ensure that the fuel sender matches the type of fuel tank onboard to ensure proper usage of all fuel tanks.

Digital signal or analog signal?

If selecting a fuel sending unit, you should also consider the ohms range or calibrated fuel sender.

In fuel tanks with non-electronic gauges, standard Ohms fuel level senders are commonly used. Their performance does not depend on battery voltage or fuel temperature.

Tank shape

The shape of the tank is the most significant factor to consider when planning fuel sending units.

It is imperative for customers who purchase fuel sending units to have them calibrated with their tanks.

It is critical to check their compatibility because fuel gauges will not work accurately if they do not match the pattern of tanks.

Therefore, before purchasing fuel-sending units, customers should pay attention to this aspect.

Float

As part of the fuel sending unit, the float determines the fuel level in the tanks using a float system. This mechanism measures how much fuel has been consumed.

Leaks may also occur because of corrosion or other reasons, and you can also use them to detect them.

Fuel Gauge

Fuel gauges are electrical devices installed in fuel sending units. Accordingly, it shows precise information about fuel levels inside tanks since it is calibrated to match tank shape and volume.

The working mechanism of this component is based on Ohm’s law. It also needs a power supply to operate and is connected to a fuel tank.

The Tank Depth

An incredibly crucial factor to consider is the depth of the tank. Plastic tanks should have a clearance of at least one inch, while aluminum tanks or heavy metal tanks should be able to have a clearance of 0.50 inches.

Allowing clearance will prevent abrasion of the tank during movement.

This measurement does not affect the signals sent by the fuel sending unit, so the buyer should keep that in mind.

Are Boat Fuel Gauges Accurate?

In general, gauges can be accurate, but they may not accurately reflect the fuel content of the boat.

“Square box” tanks are pretty accurate, but sailboat tanks are anything but square boxes, which is why they are used more as guides on some boats than as accurate measurements.

You will only be able to get precise readings if you place a calibrated container in the tank. Don’t forget what was in the tank before you started.

These fuel sending units are usually accurate enough for day-to-day use but not accurate enough for navigation or safety.

By removing full jugs of fuel from the boat and pouring them into the tanks, you can determine the amount of fuel in the tank. You can also determine how accurate your gauge is.

Although you may be working with gasoline, this can give you accurate readings on the sending unit and gauge combination. It can also tell you what’s accurate about each.

If the gauge, sending unit, and calibration of the gauge and sending unit are all accurate and calibrated simultaneously, boat fuel gauges can be reasonably accurate.

Although they will provide a reasonable estimate of how much fuel is left in the tank for day-to-day use, they cannot be relied upon as your only source of accurate information.

What Type of Sending Unit Does The Fuel Gauge Use?

A float-type sending unit is used in the fuel gauge.

How Do You Measure a Boat Fuel Sending Unit?

The water tank depth can be measured by measuring from the top, near the sending unit, of the tank.

You will then need to trim down your kit’s new arm. These usually come in 24-inch length options to fit your measurements based on the particular model you are using.

What are The Symptoms of a Bad Fuel Sending Unit?

The three most common symptoms indicate a malfunctioning fuel sending unit:

  1. The tank is full, but the fuel gauge shows empty.
  2. The fuel gauge remains at 100%.
  3. There is a fluctuation between empty and full fuel gauges.

How Do You Troubleshoot a Boat Fuel Sender Unit?

Basic troubleshooting of your boat fuel gauge involves examining the gauge for ground and voltage. You can use a multimeter or test light for this.

When the red wire of your meter is connected to the I terminal (positive ignition) and the black wire to the G terminal (ground), the meter should read 12 volts of power. If not, there is a problem with your wiring.

There may be an issue with the gauge’s sending unit if you have power but no reading on the meter. It can be caused by corrosion or a faulty ground wire that connects the fuel tank and boat frame.

Low voltage is the most common cause of gauge problems on boats that are driven fast.

Can You Use the Boat With a Broken Fuel Sender Unit?

In the event that the fuel sender in your boat is unknown or defective, we would not recommend operating the boat.

In addition to being inconvenient, it can be dangerous as well when you run out of gas. Furthermore, why risk running out of fuel and being stranded on the water?

Until you can replace the unit, we recommend limiting your driving until the issue is resolved. Alternatively, you can ensure the fuel gauge is accurate by having the part replaced.

What Do I Need to Know Before Replacing Fuel Sender Unit?

Fuel sending units are usually easy to replace. In most cases, you will need to purchase a replacement part from an online retailer. Install a new one after removing the old one.

Depending on your boat model, you might be able to remove it yourself without the need for any special tools.

If you have questions, the owner’s manual for your vehicle will tell you how to replace your fuel sending unit.

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