Craftsman String Trimmer Primer Bulb Replacement

Craftsman String Trimmer Carburetor & Primer Bulb Parts

Ethanol damage is the #1 enemy of string trimmer carburetors. When your Craftsman trimmer won't start, runs rough, or quits mid-job, the carburetor and primer bulb are almost always the culprits. Old fuel gums up the needle and seat; cracked primer bulbs won't draw fresh fuel into the carb. The good news: OEM Craftsman carburetor kits and replacement primer bulbs are affordable fixes that restore your trimmer to reliable operation.

Whether you're rebuilding with a carburetor kit or swapping out a cracked primer bulb, match your Craftsman model number for exact fit. Our OEM parts ensure proper fuel delivery and idle tuning without the guesswork of aftermarket alternatives.

• Won't start or hard to start: Carburetor kit (float, needle, gaskets) or primer bulb cracked/won't draw fuel
• Runs too rich or too lean: Carb jets or needle-seat assembly corroded; rebuild kit restores fuel mixture
• Fuel leaks from carburetor: Float stuck open or needle seat worn; full carburetor replacement or gasket kit
• Primer bulb cracked or spongy: No fuel pressure; replacement bulb required
• Engine dies after starting: Clogged carb passage or failed primer bulb preventing fuel draw

Craftsman String Trimmer Carburetor & Primer Bulb Repair Guide

Why does my Craftsman string trimmer carburetor fail so often?

Ethanol-blended fuel degrades inside the carburetor over weeks or months of storage. The ethanol attracts moisture, which corrodes the float, needle, and seat. Even fresh fuel can gum up carb ports if the trimmer sits unused. A carburetor rebuild kit (gaskets, seals, fuel line, primer bulb) costs $15 to $35 and fixes 90% of Craftsman trimmer starting issues. Full carburetor replacement runs $40 to $80 if the body itself is cracked.

What's the difference between a carburetor kit and a full replacement carburetor?

A carburetor kit includes the small internal wear parts — float, needle, gasket set, fuel line, primer bulb — and is ideal for ethanol damage, hard starts, and running issues. A full replacement carburetor is necessary only if the main body is cracked, the threaded ports are stripped, or corrosion is severe. For Craftsman trimmers, start with a kit; the full carb is a last resort. Always use your model number to confirm which kit fits — Craftsman made several trimmer generations, and carb fitment varies.

How do I know if the primer bulb is bad?

Squeeze the primer bulb — if it's spongy, cracked, or doesn't build resistance, it's failed. A good bulb should feel firm and spring back quickly. If fuel doesn't flow after 5 to 10 pumps, the bulb isn't drawing fuel from the tank, which means the check valve inside is stuck or the bulb itself has lost seal. Replacement primer bulbs are $3 to $8 and take two minutes to swap. Always buy OEM — aftermarket bulbs harden and crack faster.

Can I use a universal carburetor kit on my Craftsman trimmer?

Universal kits exist, but they're a gamble — fitment issues are common and can leave your trimmer underfueled or overfueled. Craftsman trimmer carburetors vary by model and engine type (Tecumseh, Kohler, proprietary). Use your Craftsman model number (CMXGTAMD., CMXGDAM.) to find the exact OEM kit or full carburetor. Spending an extra $10 for the right kit saves frustration and prevents lean-run damage to the engine.

Order Craftsman String Trimmer Primer Bulb Replacement Online

Ensure your Craftsman string trimmer runs efficiently by replacing a faulty primer bulb. When your trimmer won't start or runs rough, the primer bulb may be to blame. Purchasing genuine Craftsman string trimmer primer bulb replacements online is easy and convenient. Use our model number lookup to quickly find the correct part, and take advantage of our same-day shipping to get your trimmer back in action fast. For more repair tips and guidance, visit our String Trimmer Repair Help page.

Browse our full selection of Craftsman String Trimmer Carburetor Primer Bulb Parts to keep your equipment performing at its best.

Craftsman String Trimmer Model Number: Where to Look

On Craftsman string trimmers, look for the model number on the main housing near the engine or on the label along the shaft. You may need to brush away dirt or move the guard aside to read the sticker clearly. The number can include letters, periods, or several groups of digits, so copy it exactly as shown. Type it into the model number search to pull up the parts matched to your unit, including the correct carburetor, primer bulb, and other replacement parts. Using the complete model number filters the catalog for your whole Craftsman trimmer, not just one part category. That means fewer wrong orders and a faster repair.