Briggs & Stratton Primer Bulbs
Replace worn or damaged primer bulbs with our extensive selection for Briggs & Stratton engines. We stock carburettor primer bulb assemblies in various sizes suitable for walk-behind mowers, chainsaws, trimmers, and small engine applications. Our inventory includes standard rubber lawn mower primer bulb components, complete mounting assemblies with retaining rings, and sealed Briggs & Stratton primer bulb kits for reliable cold starting. Whether you need a direct replacement Briggs & Stratton carburettor primer bulb or complete assembly with springs and check valves, we hold genuine manufacturer parts in stock and sell worldwide for dependable engine priming performance.
Available Briggs & Stratton Primer Bulbs
Fuel Tank
291488
Briggs & Stratton
£107.15
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Fuel Tank
699392
Briggs & Stratton
£80.05
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Seal O Ring
710072
Briggs & Stratton
£6.20
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Spring Rewind
490179
Briggs & Stratton
£17.05
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Battery Cover
7028990YP
Briggs & Stratton
£22.70
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V Belt
5106125
Briggs & Stratton
£36.31
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Diaphragm Carburetor
270026
Briggs & Stratton
£4.65
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Carburetor Diaphragm
272538S
Briggs & Stratton
£5.05
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Valve Exhaust
211119S
Briggs & Stratton
£22.60
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Keeper Valve
494553
Briggs & Stratton
£6.10
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Spring Governor
793342
Briggs & Stratton
£6.50
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Spline Starter
799420
Briggs & Stratton
£20.17
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Frequently Asked Questions
How do I know when my primer bulb needs replacing?
Look for visible cracks, splits, or holes in the rubber—even tiny punctures cause air leaks that prevent proper priming. If the bulb stays compressed and won't pop back out, or feels excessively hard and brittle when pressed, it's worn out. Petrol leaking from around the bulb during priming is another clear sign. Most primer bulbs deteriorate after 2-3 years due to fuel exposure and weather, becoming hard and losing their flexibility. Replace them whenever you notice these symptoms or when performing carburettor work.
Why won't my primer bulb fill with fuel when I press it?
Check for air leaks first—cracked fuel lines or loose connections prevent the vacuum needed to draw fuel. The bulb itself may be cracked or the internal check valve stuck. Ensure fuel lines aren't reversed; the line from tank should connect to the inlet side. A blocked fuel filter or collapsed fuel line can also prevent filling. Try holding your finger over the return line whilst pressing the bulb—if it still won't return to shape, the check valve has failed and needs replacement.
Can I repair a cracked primer bulb or must I replace it?
Always replace cracked primer bulbs rather than attempting repairs. Even small cracks allow air into the fuel system, preventing proper engine starting. Temporary fixes like tape or glue won't withstand petrol exposure and create fire hazards. Primer bulbs are inexpensive and straightforward to replace—typically just removing a retaining ring or a few screws. When replacing the bulb, inspect fuel lines simultaneously as they often deteriorate at the same rate and should be replaced together.
Should my primer bulb have a small hole in it?
Some Briggs & Stratton designs feature a tiny vent hole in the primer bulb by design—this isn't a defect. The hole helps equalise pressure and allows proper fuel flow after the engine starts. However, if petrol actively leaks from this hole during priming, the carburettor's needle valve is likely stuck open, flooding the system. Don't confuse a designed vent hole with damage—cracks or tears that leak fuel require immediate bulb replacement for safe operation.
Why does my primer bulb stay down after pressing it?
A stuck or clogged check valve inside the carburettor prevents the bulb returning to its original shape. This often happens when debris blocks the valve or when old fuel varnish gums up internal components. A severely blocked fuel filter or collapsed fuel line can also create excessive vacuum. Try removing the fuel filter temporarily to test—if the bulb works normally, replace the filter. If problems persist, the carburettor requires cleaning or the check valve assembly needs replacement.