188-512-1 – Primer Bulb / Primer Pump (OEM Walbro Replacement Part)
The 188-512-1 Primer Bulb is an OEM-compatible replacement designed for Walbro fuel systems and small engine applications that use a primer bulb to assist in cold starts. This primer bulb helps draw fuel into the carburetor before starting, reducing pull-start effort and improving ignition reliability—especially in equipment that sits between uses or in cooler conditions.
Manufactured to meet Walbro performance standards, this primer bulb provides proper fitment, flexible operation, and long-lasting durability for outdoor power equipment.
Product Details
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Manufacturer Part Number: 188-512-1
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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 Primer Bulb
Function
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Primes the carburetor by delivering fuel into the bowl before starting
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Reduces pull-start effort on cold engines
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Improves starting performance and consistency
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Flexible, durable design resists cracking and fuel permeation
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Helps ensure reliable operation of Walbro carburetor systems
Compatible With
The Walbro 188-512-1 Primer Bulb fits a wide range of small engines and outdoor power equipment models that use Walbro-style primer systems, including but not limited to:
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String trimmers
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Brush cutters
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Hedge trimmers
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Chainsaws
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Lawn mowers
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Blowers
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Other handheld and walk-behind power equipment
(Compatibility varies by carburetor and equipment. Always verify fitment with the exact engine/equipment model before ordering.)
How It’s Used
This primer bulb installs into the carburetor or primer housing on compatible outdoor power equipment. Press the bulb several times before starting to draw fuel into the carburetor, which improves cold starting performance and reduces strain on the starter mechanism.
Refer to your equipment’s owner’s or service manual for exact installation and priming procedures.
