Toro String Trimmer Primer Bulb Replacement

Toro String Trimmer Carburetor and Primer Bulb Parts

Toro string trimmers are built for reliability, but carburetors and primer bulbs take the brunt of seasonal storage and ethanol fuel damage. When your Toro won't start, runs rough, or hesitates under load, the carburetor is almost always the culprit. The primer bulb draws fuel into the carb before each start — when it cracks or hardens, you lose prime and face a no-start condition.

Repair Clinic carries OEM Toro carburetors, rebuild kits, and primer bulbs for every model. We stock exact-fit parts that restore your trimmer to factory performance. No guessing, no aftermarket compromises.

• Carburetor won't start or hard start: Ethanol damage to float, needle seat, or jets; OEM rebuild kit or full carburetor replacement
• Runs lean or rich: Clogged or damaged carburetor passages; full disassembly and clean or replacement recommended
• Primer bulb cracked or hardened: Loss of fuel prime before start; replacement bulb restores suction
• Fuel won't flow to carburetor: Cracked fuel line, clogged line, or bad check valve in primer bulb assembly
• Trimmer dies under load: Carburetor fuel delivery falters; usually a needle/float issue requiring rebuild or replacement

Enter your Toro model number to find the exact carburetor and primer bulb assembly for your trimmer. OEM parts ship same-day.

Toro String Trimmer Carburetor and Primer Bulb FAQs

Why does my Toro string trimmer carburetor keep clogging?

Ethanol fuel blends absorb moisture and leave varnish deposits that clog jets, gum up floats, and corrode the needle seat. Toro carburetors are particularly susceptible after 30 days of idle storage. A carburetor rebuild kit cleans internal passages and replaces the gasket set — it's often cheaper and faster than a full replacement. If you store your trimmer for winter, drain the fuel tank and run the engine dry, or add ethanol-free fuel and a fuel stabilizer to prevent carb issues before they start.

How do I know if the primer bulb is bad?

A working primer bulb feels firm with slight resistance when pressed — it should pull fuel into the line within 3 to 5 squeezes. If the bulb is soft, mushy, cracked, or won't hold pressure when released, it's failed. Also check the fuel line for cracks or blockages — a bad fuel line can make a good primer bulb seem ineffective. On Toro trimmers, the primer bulb and check valve often come as one assembly, so replace the whole unit for reliability.

Can I rebuild my Toro carburetor instead of replacing it?

Yes — OEM Toro carburetor rebuild kits include gaskets, seals, needle, and float — everything except the main body casting. Rebuild kits cost $15 to $30 and work well if the casting is sound and there's no visible cracking. If the carburetor body is cracked, corroded, or the float is punctured, full replacement is the right call. Rebuild kits are ideal for ethanol varnish buildup; full carburetors are needed for internal damage.

How do I enter my Toro trimmer model number to get the right carburetor?

The model number is stamped on the engine housing or printed on a decal near the pull cord — it usually starts with "GTS," "FS," or "ST" followed by numbers. Use the Repair Clinic model finder at the top of this page: enter your full Toro model number, and we'll show you the exact OEM carburetor, primer bulb, and related fuel system parts for your trimmer. If you can't find the model number, a photo of the decal helps our team confirm the right parts.

Order Toro String Trimmer Primer Bulb Replacement Online

Ensure your Toro string trimmer starts smoothly with a high-quality primer bulb replacement. Easily find the perfect Toro string trimmer primer bulb online, thanks to our model number and part lookup tools. With a commitment to fast service, we offer same-day shipping to get your replacement parts to you as quickly as possible. Rest easy with our No-Hassle 365-Day Returns policy, allowing you to return any uninstalled part within a year. Plus, take advantage of our Price Match Guarantee to help you shop with confidence on genuine Toro parts. For additional assistance, check out our String Trimmer Repair Help section. Find more Toro String Trimmer Parts to keep your equipment running efficiently.

Locating the Model Number on Your Toro String Trimmer

On Toro string trimmers, look for the model number on a decal on the main housing near the engine, around the pull cord, or on the shaft label. Clear away grass and dirt so you can read the complete number, including any letters. This number identifies the entire trimmer, not just the carburetor or primer bulb, and it is the key to matching every associated part. Type it into our model number lookup and the catalog narrows to parts made for your unit. Checking the full model number before ordering helps you avoid confusing similar Toro trimmers and makes it easier to get the right replacement parts the first time.