Are Tecumseh parts still available?
Yes. Replacement parts for the Tecumseh LA318SA-156554 lawn and garden engine are still available, including common service items like carburetor parts, O-rings, floats, and ignition components. The most reliable approach is matching your engine model number and then ordering the exact part ID listed for your engine.
Parts we commonly see customers replace on LA318SA-156554
If your engine is hard to start, surges, leaks fuel, or won’t stay running, these parts are frequent fixes:
- Carburetor and carburetor rebuild components
- Float bowl and float (fuel level control)
- Needle seat and O-rings (fuel sealing)
- Air filter (restricted airflow causes rich running)
- Ignition parts (no-spark or intermittent spark symptoms)
Helpful examples from the parts list for this model include the carburetor 640349 and the Tecumseh lawn and garden equipment engine carburetor rebuild kit 632760B.
How to make sure you get the right Tecumseh part
We recommend verifying fit before ordering, especially on older small engines where similar parts look alike.
- Confirm the engine model number is LA318SA-156554 (not just the mower or tractor model)
- Compare the part name and part ID to what you’re replacing
- If you’re rebuilding fuel delivery, replace seals at the same time to prevent air leaks
- For fuel leaks, inspect the bowl gasket area and needle seat first
- For no-start, check spark and fuel separately before buying multiple parts
Quick guide: rebuild vs replace the carburetor
| Situation | Best next step | Typical parts to use |
|---|---|---|
| Fuel leaks from carb area, dirty bowl, varnish from old gas | Rebuild | Tecumseh lawn and garden equipment engine carburetor rebuild kit 632760B |
| Throttle shaft worn, body damaged, repeated clogging | Replace | Carburetor 640349 |
| Runs only with choke on, surges at idle | Clean or rebuild first | Rebuild kit plus fresh fuel |
Why it matters
Using the exact Tecumseh part ID for LA318SA-156554 prevents mismatched gaskets, incorrect jetting, and air leaks that cause hard starting, hunting, and poor power under load.
Last updated: February 2026
Does Tecumseh still make engines?
Tecumseh no longer manufactures new small engines; the Tecumseh-branded lawn and garden engine line ended years ago. For your Tecumseh LA318SA-156554 engine, the practical path today is maintaining it with replacement parts such as carburetor and fuel-system components.
What this means for your LA318SA-156554 engine
Even though new Tecumseh engines are not being produced, we still support repairs by helping you match the correct parts to your exact model number.
Common service items for this engine include:
- Carburetor and carburetor gaskets/O-rings
- Float, needle seat, and float bowl parts
- Fuel cap and fuel tank components
- Starter and recoil rope items
- Ignition and stop-wire electrical connections
Parts that typically solve the most common problems
If your engine will not start, surges, or only runs with choke, the carburetor and its sealing parts are the first place we look.
Start with these model-matched parts:
- Carburetor 640349 (complete carburetor replacement)
- Tecumseh lawn and garden equipment engine carburetor rebuild kit 632760B (common fix for varnish, leaks, and poor running)
- Needle seat 631021B (helps stop flooding and fuel overflow)
- Lawn & garden equipment engine carburetor float bowl 631951 (fixes bowl damage and sealing issues)
- Craftsman lawn & garden equipment engine carburetor float 632019A (addresses sticking or fuel level problems)
Quick troubleshooting checklist (before buying parts)
- Drain old fuel and refill with fresh fuel (stale fuel is the top cause of no-start)
- Check the air filter and replace if dirty
- Inspect for fuel leaks around the carburetor bowl and mounting area
- Confirm the throttle and choke linkages move freely
- Verify the stop wire is not shorted to ground
Repair choice guide
| Symptom | Most likely area | Good first part to consider |
|---|---|---|
| Starts then dies | Carburetor fuel delivery | Tecumseh lawn and garden equipment engine carburetor rebuild kit 632760B |
| Runs rich or floods | Needle/seat or float | Needle seat 631021B |
| Fuel leaking at bowl | Bowl seal or bowl damage | Lawn & garden equipment engine carburetor float bowl 631951 |
| Hard starting, poor idle | Complete carb wear | Carburetor 640349 |
Why it matters
Because new Tecumseh engines are not being produced, keeping your LA318SA-156554 running depends on correct model-based parts matching. Using the right carburetor, float, and sealing components prevents repeat failures like flooding, surging, and fuel leaks.
Last updated: February 2026
Why are Tecumseh engines so hard to start?
Tecumseh engines like model LA318SA-156554 usually get hard to start when fuel delivery or airflow is restricted (stale fuel varnish in the carburetor, plugged tank vent, dirty air filter) or when ignition is weak (fouled plug, poor connection). On this model, carburetor and fuel-system service fixes most hard-start complaints.
Most common causes (and what to check first)
- Old fuel: Drain the tank and carburetor bowl; refill with fresh fuel.
- Carburetor varnish or debris: Clean passages or rebuild; replace if heavily corroded.
- Restricted airflow: Inspect and replace the air filter if dirty.
- Fuel cap vent issue: Loosen the cap slightly and try starting; if it improves, the venting is suspect.
- Float/needle sticking: Causes flooding or fuel starvation.
- Weak ignition or bad connection: Check plug condition and the kill-wire connection.
Parts that commonly solve hard-start problems
If you are seeing fuel leaks, flooding, surging, or it only runs on choke, these parts are the most relevant for LA318SA-156554:
- Carburetor 640349
- Tecumseh lawn and garden equipment engine carburetor rebuild kit 632760B
- Needle seat 631021B
- Float 632019A
- Craftsman lawn & garden equipment engine air filter 28424
- Lawn & garden equipment engine fuel tank cap 37845
Quick symptom-to-fix guide
| Symptom | Most likely cause | Best next step |
|---|---|---|
| Starts only with choke | Lean fuel mix from clogged carb | Clean/rebuild carb; check for air leaks |
| Fuel dripping from carb | Stuck float or worn needle seat | Replace float/needle seat; rebuild carb |
| Hard pull, then starts | Flooding or rich condition | Check float level, needle seat, air filter |
| Starts then dies after a minute | Tank not venting or fuel restriction | Test fuel cap vent; check fuel flow |
Why it matters
Hard starting is usually the first sign of carburetor contamination from storage fuel. Fixing it early prevents repeated rope pulls, plug fouling, and ongoing surging or stalling.
Last updated: February 2026
How do I tell what year my Tecumseh engine is?
To tell the year on your Tecumseh engine (model LA318SA-156554), we use the engine’s identification numbers, not the mower’s model. Find the engine’s model/spec/serial or date code stamped on the shroud or on an ID tag; then decode the date portion to determine the production year.
Where to find the date or serial information
Look for a sticker or stamped numbers in these common spots:
- On the blower housing (recoil starter shroud)
- Near the spark plug area on the shroud
- Under or beside the carburetor area
- On the engine block near the flywheel side
- On an ID tag riveted to the shroud
What numbers to write down (and why)
For Tecumseh engines, the key identifiers are usually:
- Model number (example format: LA318SA)
- Spec number (build configuration)
- Serial number or date code (this is what reveals the year)
- Any extra suffixes after the model (they can matter for parts matching)
Quick decode guidance (typical Tecumseh formats)
Tecumseh used a few different label styles over the years. In many cases, the first digits of a date code represent the production date (often including the year), while some serial numbers embed the year.
| What you see on the engine | What it usually means | What to do next |
|---|---|---|
| A code labeled like a date or D.O.M. | Direct manufacturing date info | Use the first digits to identify the year, then confirm month/day if shown |
| A long serial number string | Production tracking number | Look for a year segment near the beginning of the serial |
| Model + spec only (no clear date) | Identifies the engine family and build | Use the model/spec to match parts, then use serial/date code if present |
Why it matters
The production year helps us match the correct carburetor, ignition, and fuel system parts because Tecumseh often changed jetting, linkages, and gasket styles across different production runs of the same engine family.
Parts that commonly depend on the exact engine ID
If you are identifying the year to order parts for LA318SA-156554, these are the most common “ID-sensitive” items:
- Carburetor 640349 (fuel metering and linkage style)
- Tecumseh lawn and garden equipment engine carburetor rebuild kit 632760B (gaskets, needle, seals)
- Needle seat 631021B (float valve sealing)
- Lawn mower o-ring 631028A (fuel bowl or carb sealing point)
- Lawn & garden equipment engine intake manifold 33877 (mounting and gasket match)
Last updated: February 2026
