Owner’s manual
How to replace line on Craftsman gas trimmer?
To replace the cutting line on your Craftsman 358791570 gas line trimmer, we remove the spool cap, wind new 0.080-inch (2 mm) trimmer line onto the spool without overlapping, then reinstall the cap and pull the line ends to the correct length. See the owner's manual for your exact head style.
Safety first
- Shut the engine off and let it cool.
- Disconnect the spark plug wire before working near the trimmer head.
- Wear gloves and eye protection.
- Keep the shield installed and the head securely fastened.
Reloading the trimmer line (typical bump-head steps)
- Clean grass and debris off the trimmer head so the cap releases easily.
- Remove the spool cap (most caps twist off; some use tabs).
- Take out the spool and note the direction arrow for winding.
- Cut a length of 0.080 in (2 mm) line (most heads take about 10 to 20 ft total).
- Feed the line into the spool anchor hole or split it evenly if it is a dual-line spool.
- Wind the line tight and even, laying it side-by-side with no overlapping.
- Thread the line ends through the eyelets in the head.
- Reinstall the spool and snap or twist the cap back on.
- Pull both ends to free the line, then trim to a practical length.
Quick checks if the line keeps tangling or won’t feed
- Line diameter: use 0.080 in (2 mm) only (too thick binds; too thin breaks).
- Winding: overlapping wraps cause jams.
- Spool cap: replace a cracked or loose cap such as the line trimmer spool cap 530054224.
- Debris: packed grass inside the head prevents smooth feeding.
Line spec at a glance
| Item | What to use | Why |
|---|---|---|
| Line diameter | 0.080 in (2 mm) | Feeds correctly and reduces binding |
| Winding pattern | Tight, side-by-side | Prevents tangles and uneven feed |
| Cap condition | Secure, not cracked | Keeps spool aligned |
Why it matters
Correct line size and neat winding help your Craftsman trimmer cut efficiently, reduce vibration, and prevent constant bump-head jams that wear the spool and cap.
Last updated: February 2026
What is the fuel mix for a Craftsman gas trimmer?
For the Craftsman gas line trimmer model 358791570, use a 40:1 fuel mix (unleaded gasoline to 2-cycle, air-cooled engine oil). That equals 3.2 fl oz of 2-cycle oil per 1 gallon of gas; this ratio helps prevent engine damage and hard starting (see the owner's manual).
Quick mix chart (40:1)
Use this table to measure oil accurately before you fill the fuel tank.
| Gasoline amount | 40:1 oil amount |
|---|---|
| 1 gallon | 3.2 fl oz |
| 1/2 gallon | 1.6 fl oz |
| 1 quart | 0.8 fl oz |
How we recommend mixing fuel
Mix fuel in an approved gas container, not in the trimmer tank.
- Use fresh unleaded gasoline
- Use synthetic 2-cycle air-cooled engine oil (not automotive oil, not marine oil)
- Add the measured oil to the gas can first, then add gasoline
- Cap the container and shake briefly to fully blend
- Wipe up spills and move at least 10 feet away from the fueling spot before starting
Fuel tips that prevent common trimmer problems
A correct mix ratio is only part of reliable performance; fuel quality and storage matter too.
- Avoid long-term storage of alcohol-blended fuel; it can contribute to fuel system issues over time
- If you store fuel, use a stabilizer and run the engine a few minutes after adding it
- If the trimmer runs lean, surges, or will not stay running, inspect the fuel lines for cracks or leaks
- Replace deteriorated fuel tubing with the correct size line such as ayp lawn & garden equipment fuel line, large 530069216
Why it matters
A 2-cycle engine depends on oil mixed into the gasoline for lubrication. Too little oil can score the piston and cylinder; too much oil can foul the spark plug and cause heavy smoke and poor throttle response.
Ordering the right parts
We list model-matched replacement parts for Craftsman 358791570 on this page; you can also search by model number on Sears PartsDirect if you are servicing multiple outdoor power tools.
Last updated: February 2026
What trimmer line does Craftsman use?
For the Craftsman 358791570 gas line trimmer, we recommend using 0.080 inch (2 mm) diameter Craftsman brand trimmer line. Using the correct diameter helps the trimmer head feed properly, reduces vibration, and prevents premature wear.
Correct line size and what to avoid
Use the line size specified in the owner's manual. Avoid substitutions that can damage the head or create a safety hazard.
- Use: 0.080 inch (2 mm) diameter trimmer line
- Do not use: wire, rope, string, or any non-nylon material
- Do not oversize: thicker line can overload the engine and jam the head
- Keep it trimmed: maintain proper cutting line length during use
Quick compatibility checklist
If you are buying replacement line for model 358791570, match these basics:
| Item to match | What to choose | Why it matters |
|---|---|---|
| Line diameter | 0.080 in (2 mm) | Ensures proper feed and cutting performance |
| Line material | Nylon trimmer line | Prevents dangerous breakage and head damage |
| Intended use | Line trimmer use only | This unit is not designed for blades |
Why it matters
The trimmer head and engine on the Craftsman 358791570 are designed around a specific line diameter. Correct line size improves cutting efficiency and helps prevent scalping, excessive line wear, and unnecessary strain on the drive system.
Related parts you may need while servicing the trimmer
If you are already doing maintenance, these common items are available for this model:
- Poulan line trimmer spool cap 530054224 (cap that secures the spool and helps maintain proper line feed)
- Ayp lawn & garden equipment fuel line, large 530069216 (fuel line used when fixing fuel leaks or hard-start issues)
You can order replacement parts from the parts list for your model, or search by model number on Sears PartsDirect.
Last updated: February 2026
What size is the fuel line on a Craftsman trimmer?
On the Craftsman 358791570 gas line trimmer, the exact fuel line inside diameter and outside diameter are not specified in the excerpts we have; most small 2-cycle trimmers use a small return line and a larger supply line, and the correct fit is the one that seals tightly on the tank grommet and carburetor fittings without kinking. For model-correct routing and service steps, use the owner's manual.
How to identify the correct fuel line size (without guessing)
- Remove the air filter cover so you can see the carburetor fuel fittings.
- Check whether your trimmer uses two lines (common):
- Supply line from tank filter to carburetor.
- Return line from primer bulb back to tank.
- Measure the old line if it is intact:
- ID (inside diameter) must match the fitting diameter.
- OD (outside diameter) must seal in the tank opening or grommet.
- If the old line is brittle or swollen, match by fitting snugness, not by the stretched old measurement.
- Replace any line that is soft, cracked, or leaking; the manual calls out checking for and repairing fuel leaks before use.
Recommended replacement approach for model 358791570
For this model, we list a large fuel line that is commonly used as the main fuel supply line on many Craftsman trimmers: ayp lawn & garden equipment fuel line, large 530069216. If your trimmer also uses a smaller return line, select it from the parts list for this model, then confirm routing using the manual.
Quick fit check
| What you see | What it usually means | What to do |
|---|---|---|
| Line slips on fitting easily | ID is too large | Use a smaller ID line |
| Line will not push onto fitting | ID is too small | Use a slightly larger ID line |
| Line kinks when bent | OD too large or line too stiff | Use correct OD or more flexible line |
| Fuel smell or wet tank area | Poor seal at tank opening | Replace line and any sealing grommet if used |
Why it matters
Fuel line size affects priming, starting, and safe operation. A loose line can suck air and cause hard starting; a line that is too tight can split or restrict fuel flow, leading to stalling under throttle.
If you need additional parts beyond what is listed for the 358791570, we recommend searching by model number on Sears PartsDirect.
Last updated: February 2026
Why does my Craftsman trimmer die when I give gas?
When your Craftsman gas line trimmer model 358791570 dies as you squeeze the throttle, it is usually running too rich or too lean under load. The most common causes are restricted airflow (dirty air filter), fuel delivery problems (cracked fuel line, loose fuel cap venting), or a carburetor that needs adjustment; use the owner's manual for the correct maintenance and adjustment guidance.
Quick checks we recommend first
- Make sure you are using fresh, properly mixed fuel (old fuel can cause bogging and stalling).
- Inspect the fuel lines for cracks, soft spots, or loose connections; replace as needed.
- Loosen the fuel cap briefly and retry (a plugged cap vent can starve fuel).
- Check the air filter; a clogged filter can make the engine run overly rich and stall.
- Verify the cutting line is the correct size; this model specifies 0.080 inch (2 mm) line.
- Confirm the trimmer head and shield are installed correctly and not dragging.
Fuel and airflow: what typically causes stalling on acceleration
A 2-cycle trimmer needs more fuel and air when you open the throttle. If either side cannot keep up, the engine will stumble and quit.
| Symptom when you give gas | Most likely area | What to do |
|---|---|---|
| Bogging, then dying | Fuel starvation | Check tank venting, fuel lines, and carburetor settings |
| Sputtering, heavy fuel smell | Too rich | Clean/replace air filter; check choke use; adjust carburetor |
| Runs only with partial choke | Lean condition | Check for air leaks, clogged fuel pickup, or restricted fuel line |
Parts that often fix the problem
If you find fuel line damage or leaks, replacing the line is a strong first repair for model 358791570. We stock the ayp lawn & garden equipment fuel line, large 530069216.
Safety note before servicing
- Stop the engine and let it cool before removing the fuel cap.
- Mix and pour fuel outdoors, away from sparks or flames.
- Disconnect the spark plug before maintenance (except carburetor adjustments).
Why it matters
Stalling on acceleration is more than an annoyance; a lean condition can overheat the engine, while a rich condition can foul the spark plug and waste fuel. Fixing airflow, fuel delivery, and correct line size restores power and protects the engine.
If you need additional parts beyond what is listed for this model, you can search by model number on Sears PartsDirect.
Last updated: February 2026
