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Moeller hose and primer bulb assemblies are EPA- and CARB-approved and UV resistant.
Bulbs feature dual internal check valves for rapid priming and fuel flowback prevention.
The fuel line assembly connects your outboard to your Moeller fuel tank.
The inner lining of older fuel hoses is susceptible to deterioration from E-10 fuel. Many outboards use primer bulbs,
which are damaged by alcohol-blended fuels, too. If left unchecked, the liners may disintegrate and may cause clogging,
poor running, and even engine failure. Newer fuel hoses include an inner liner to prevent deterioration from
alcohol-blended fuels.
When to Replace your Outboard Fuel Line Assembly
Manufacturers generally use ten years as the lifespan for gasoline hoses, but it’s
important to inspect the fuel lines every year. If there’s any doubt, replace them with
EPA-compliant hose and new clamps. While your tank fitting is not part of the fuel asssembly,
you will want to check it when you evaluate the rest of the fuel system. Hose
should be inspected for cracks, stiffening, mushiness, and leaks around the fittings/connectors.
Check your primer bulbs. If they feel squishy to the touch and the engine can
“suck” the bulb flat, replace them. If the bulb is deteriorating, the check valves may fail
and leave you stranded out on the water.
Most fuel leaks occur at fittings, so careful installation of all components is critically important.
Moeller uses O-ring construction on all fittings for tight, leak-free connections.
For Moeller fuel line installation
instructions, go to
www.moellermarine.com.
Be sure to have the manufacturer’s
instructions handy
before you begin.
Remember to de-pressurize
the fuel system before you
begin work.
⚠
CAUTION: A1-15 is the ONLY
fuel line you may use in an engine
compartment. NEVER substitute
B1-15 or any other line—only A1-15
is fire-rated.
Fuel Line Components
Hose
The new EPA-mandated fuel lines (A1-15 and B1-15) use a tough
inner liner which is compatible with ethanol blended fuels. The result
is a less flexible hose, which makes it more difficult to install
with other components. Take care when routing the lines; tight
curves will generate kinks and flow stoppages, so make sure
each bend radius is at least six inches.
Clamps
The clamps that keep the fuel lines tight are critical and warrant checking. They prevent fuel leaks and, just as
important, prevent air leaks. Air leaks can ruin an engine in no time because the fuel/air mixture will become
lean (too much air) and the engine will starve for fuel and burn up as a result. Use new quality all-stainless
clamps if the old ones won’t hold, are corroded, or are falling apart. Hose clamps are cheap compared to a damaged
engine. All Moeller clamps are 100% stainless steel.
Anti-Siphon Valves (ASV)
Anti-siphon valves reside in the outlet fitting from the tank to the engine (typically threaded right into the fitting)
with a hose nipple on the fuel line end. The anti-siphon feature prevents fuel from flowing into the bilge if a failure
occurs in the fuel line. Some cheaper valves can cause fuel restrictions to the engine; if you experience this,
don’t be tempted to simply remove the anti-siphon valve. Instead, replace it with a quality Moeller anti-siphon
valve.
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