Marine Fuel Tanks

Boat Fuel Tanks

Boat fuel tanks and systems are crucial for your boat. Outboard fuel tanks require regular maintenance to prevent hazards and ensure your boat motor starts. Fuel is flammable and doesn’t mix with water, making checks essential. Proper care reduces risks and extends the life of your fuel tanks.

Exposure to the sun can cause condensation in boat fuel tanks, leading to water mixing with the fuel. This can corrode the engine. Keep your tank nearly full and use high-octane fuels like premium 98 to minimize issues. Avoid high ethanol-blended fuels as they absorb water, causing motor problems. Always check fuel condition before heading out to prevent performance issues.

How big does your boat fuel tank have to be?

Depending on your boat size and destination, carry extra fuel. Beginners often assume they need just enough fuel for a round trip. However, the general rule is to use one-third of your fuel to get there, one-third to get back, and one-third as a reserve for changing conditions like tides or weather.

It's important to monitor your fuel levels accurately. Using reliable fuel gauges for boats ensures you can track your fuel consumption, prevent unexpected shortages, and keep your boating experience smooth and hassle-free. Regularly checking your fuel gauge helps maintain engine health and efficiency.

If you want to change your outboard fuel tank capacity, check with the manufacturer for legal requirements and necessary modifications. You may need approval or updated builder plates for any changes made to your boat fuel tanks. Also ensure all fuel fittings are secure to prevent leaks and maintain optimal fuel flow.

Why would you upgrade your outboard fuel tanks?

Carrying a jerry can of fuel takes up more space in the boat, especially noticeable in a small boat with more passengers.

Common boat fuel tank issues:

Water build-up: Keeping the outboard fuel tank full can lessen condensation. Leave about 5% of air to allow for expansion.

Stale fuel: Fuel in outboard tanks can go stale in as quickly as a month, depending on the weather. In hot climates, it can start to degrade within weeks. Add fresh fuel regularly to keep the fuel from evaporating. If you won’t use your boat for a few months, empty the fuel tanks completely to prevent corrosion and build-up.

Clogged fuel lines: Gum and varnish can block fuel lines. Replace blocked lines or flush slightly affected ones with the appropriate products. Check for crimping if fuel is not reaching the engine.

Fuel filters: Replace the fuel filter in your outboard motor once a year.

Damaged fuel injectors: Keep an eye out for issues in fuel delivery which might indicate damaged injectors.

Engine misfires: Misfires can be caused by various fuel system issues.

Reduced fuel efficiency: Inefficiency can result from stale fuel, clogs, or damaged components.

General engine damage: Water build-up, stale fuel, and other issues can lead to engine damage.

Fuel primer bulb: The primer bulb loses pressure and wears out, requiring replacement.

Cleaning: Fuel additives can separate and sink to the bottom of the tank. Clean your fuel tanks regularly to avoid black sludge or sediment build-up.

If your boat sits idle for months, use a fuel treatment to maintain engine health. Treatments stabilize fuel, prevent gum and varnish build-up, and ensure smooth engine starts when you're ready to hit the water again.

How to empty a boat fuel tank

To empty a boat fuel tank:

• Safety First: Ensure you are in a well-ventilated area, away from open flames or sparks. Wear protective gear such as gloves and goggles.
• Disconnect the Fuel Line: Locate and disconnect the fuel line that connects the tank to the engine.
• Use a Siphon Pump: Insert one end of the siphon pump into the fuel tank and the other end into a suitable container. Start the siphon to transfer the fuel.
• Drain Through a Drain Plug: If your tank has a drain plug, open it and let the fuel drain into a container. Close the plug securely afterward.
• Dispose of Fuel Properly: Dispose of the old fuel according to local regulations to avoid environmental harm.

How long do boat fuel tanks last?

Plastic (HDPE) fuel tanks generally last between 20 and 30 years, depending on UV exposure, chemical storage, and temperature. They are less expensive and lighter than stainless steel tanks but are more susceptible to punctures and fuel permeation over time.

Stainless steel fuel tanks are highly durable and resistant to corrosion, often lasting over 50 years if properly maintained. They are more expensive than aluminum or plastic tanks but offer superior longevity and reliability. Regular inspections and maintenance are important for extending the lifespan of any fuel tank.

Why shop with Outback Equipment?

• We’re Australian owned and operated – Based right here in the south of Brisbane. If you ever need help with an order or a product, you can call straight through to our friendly local team.
• Plenty of payment options – Pay via PayPal, MasterCard, Visa, zipMoney, Afterpay, and direct deposit – whichever is most convenient for you.
• Delivered to your door – We deliver your goods straight to your door to save you time and energy.

Order Your Marine Fuel Tank Today

Stay in complete control of your boat with our range of boat fuel tanks and accessories. For the best boat fuel tanks Australia has to offer, shop online to find the finishing touches for your recreational boat today.