Walbro 188-12-1 Primer Bulb – Replacement Lawn & Garden Equipment Carburetor Fuel Priming Component

Part Number: 188-12-1
Category: Walbro Lawn & Garden Equipment Carburetor Replacement Parts
Type: Replacement Carburetor Fuel Primer Bulb

The Walbro 188-12-1 Primer Bulb is a genuine OEM carburetor fuel priming component designed for compatible Walbro WA, WT, WY, WJJ, WYJ, WKK, WYK, WYL, WYP, and WZ Series carburetors. Featuring a 3/4-inch outside diameter and 9/16-inch height, this clear primer bulb helps move fuel through the carburetor priming circuit to support dependable engine starting. Designed for compatible gasoline-powered string trimmers, chainsaws, leaf blowers, hedge trimmers, and other handheld outdoor power equipment, the Walbro 188-12-1 provides a practical replacement for cracked, hardened, leaking, or damaged primer bulbs. Its application-specific design helps restore proper fuel priming and reliable carburetor operation.

Product Specifications

• Part Number: 188-12-1

• Brand: Walbro

• Product Type: Carburetor Primer Bulb

• Component Type: Fuel Priming Bulb

• Bulb Outside Diameter: 3/4"

• Bulb Height: 9/16"

• Bulb Color: Clear

• Compatible Carburetor Series: Select Walbro WA, WT, WY, WJJ, WYJ, WKK, WYK, WYL, WYP, and WZ

• Walbro Replacement References: 188-12, 188-14-1, 188-15-1, and 188-17-1

• Additional OEM References: Echo 12318140630, Homelite UP04802, Husqvarna 505306701, and Stihl 4133 121 2700

• Aftermarket Reference: Stens 615-740

• Application: Small Engine Carburetor Fuel Priming

• Quantity: 1 Primer Bulb

• Condition: New

Features & Benefits

• Genuine Walbro 188-12-1 replacement primer bulb

• Features a 3/4-inch outside diameter and 9/16-inch height

• Designed for compatible Walbro carburetor assemblies

• Helps move fuel through the carburetor priming circuit

• Supports dependable engine starting and fuel delivery

• Clear bulb allows visual inspection of fuel movement

• Replaces cracked, hardened, leaking, or damaged primer bulbs

• Provides a convenient replacement for routine carburetor maintenance

Applications

• Compatible Walbro WA and WT Series carburetors

• Select Walbro WY, WYJ, WYK, WYL, and WYP carburetors

• Select Walbro WJJ, WKK, and WZ Series carburetors

• String trimmer and brush cutter fuel system repairs

• Chainsaw and leaf blower carburetor maintenance

• Hedge trimmer and pole pruner fuel priming

• Compatible Echo, Homelite, Husqvarna, Shindaiwa, Stihl, and Tanaka equipment

• Equipment specifying Walbro 188-12-1 primer bulbs

Important Notes

• Verify Walbro part number 188-12-1 before ordering

• This listing is for one replacement carburetor primer bulb, not a complete carburetor or fuel system repair kit

• Confirm the required 3/4-inch outside diameter and 9/16-inch bulb height

• Not every Walbro carburetor within the listed series uses the same primer bulb

• Verify compatibility with your specific carburetor model and equipment parts diagram

• Stens 615-740 is an aftermarket replacement reference and specifies compatibility with fuels containing no more than 10% ethanol; follow your equipment manufacturer's fuel requirements

• Replace primer bulbs that are cracked, hardened, leaking, or unable to prime properly

• Shut off the engine and work away from flames or ignition sources before servicing the fuel system

• Ensure the replacement bulb is properly seated and check for fuel leaks before operating equipment