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Description
188-12-1 – Primer Bulb / Primer Pump (OEM Walbro Replacement)
The 188-12-1 Primer Bulb is a high-quality OEM-compatible replacement component designed for use in Walbro carburetor systems and small engine fuel delivery applications. This primer/bulb helps deliver a small amount of fuel into the carburetor at startup to improve cold starts, reduce starting effort, and ensure quicker engine ignition.
Manufactured to meet or exceed Walbro’s performance standards, this primer bulb provides reliable fuel priming, proper fit, and long-lasting durability in outdoor power equipment environments.
Product Details
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Manufacturer Part Number: 188-12-1
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Brand: Walbro
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Part Type: Primer Bulb / Primer Pump
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System: Fuel Delivery / Carburetor Priming
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OEM Status: OEM Walbro Replacement Part
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Condition: New Replacement Priming Bulb
Function
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Primes the carburetor by delivering fuel into the intake before starting
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Reduces choke and pull-start effort on cold engines
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Helps improve starting reliability and consistency
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Flexible design resists cracking and fuel permeation
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Supports reliable performance in outdoor power equipment
Compatible With
The 188-12-1 Primer Bulb fits a wide range of small engines and outdoor power equipment that use Walbro-style primer systems. Common applications include:
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String trimmers / weed eaters
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Hedge trimmers
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Chainsaws
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Brush cutters
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Lawn mowers
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Blowers
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Other outdoor power tools using compatible Walbro carburetors
(Compatibility varies by model and carburetor configuration. Always verify fitment using your specific engine or equipment model before ordering.)
How It’s Used
This primer bulb installs directly into the primer housing or carburetor mounting location as specified by the equipment manufacturer. Gently press the bulb several times to draw fuel into the carburetor prior to starting the engine.
Refer to your engine or equipment owner’s manual for detailed installation and priming instructions.

