A strimmer that won't feed line properly can quickly turn a simple gardening task into a frustrating experience. Whether the line stops advancing altogether, only feeds intermittently, or constantly needs manual adjustment, the problem is usually caused by a worn component, incorrect line installation, or a blockage within the strimmer head.

Fortunately, most strimmer line feeding problems are straightforward to diagnose and often easy to fix.

In this guide we explain the most common reasons a strimmer line is not feeding correctly and what you can do to restore normal operation.

1. The Strimmer Line Has Been Wound Incorrectly

One of the most common causes of feeding problems is incorrectly wound line inside the spool.

If the line overlaps, twists, or is wound in the wrong direction, it may jam and prevent new line from feeding out.

Signs this is the problem

• The line will not advance when bumped

• The spool feels stuck

• Line feeds unevenly

What to do

Remove the spool and rewind the line carefully following the manufacturer's winding direction.

If you're unsure, replacing the spool with a pre-wound replacement can save time and frustration.

2. The Line Is Too Thick

Many users fit line that is thicker than the strimmer was designed to use.

While thicker line may seem stronger, it can cause feeding problems and place unnecessary strain on the mechanism.

Common symptoms

• Line repeatedly jams

• Poor feeding performance

• Increased vibration

Always check the recommended line diameter for your model.

3. The Line Has Fused Together

When nylon strimmer line becomes hot during operation, the coils can sometimes fuse together inside the spool.

This prevents the line from feeding normally.

Signs

• Line appears stuck inside the spool

• Feeding stops suddenly

• The line cannot be pulled manually

Solution

Remove the spool and inspect the line. If sections have melted together, replace the line or install a new spool.

4. The Spool Is Worn

Over time the spool itself can become damaged through normal use.

Cracks, wear, and distortion can affect the way the line feeds.

What to look for

• Visible cracks

• Damaged retaining clips

• Excessive wear around the line exits

Replacing a worn spool often resolves persistent feeding issues.

5. Dirt and Debris Inside the Strimmer Head

Grass clippings, soil, and debris can accumulate inside the strimmer head.

This build-up may interfere with the feeding mechanism.

Common symptoms

• Stiff bump-feed operation

• Intermittent line feeding

• Increased resistance when pulling line

What to do

Disassemble the head and clean away all dirt and debris before reassembling.

6. The Bump Feed Mechanism Is Damaged

Many strimmers use a bump-feed system that releases additional line when the head is tapped against the ground.

If this mechanism becomes worn or damaged, it may stop feeding line correctly.

Signs of a faulty bump feed

• No line advances when bumped

• The button sticks

• The mechanism feels loose

Replacing the bump-feed assembly may be necessary.

7. The Line Exit Holes Are Worn

The eyelets or exit holes in the strimmer head guide the line as it feeds.

Over time these can wear and create rough edges.

Possible symptoms

• Line breaking frequently

• Feeding becoming difficult

• Excessive wear on the line

Replacing the head or eyelets can improve performance.

8. The Wrong Type of Line Has Been Installed

Not all strimmer lines are the same.

Using the wrong profile or material can affect feeding performance.

Examples

• Round line

• Square line

• Twisted line

• Serrated line

Always use a line suitable for your specific strimmer model and intended use.

How This Relates to Other Strimmer Problems

Line feeding issues are often connected to other performance problems.

For example:

• If the line keeps snapping, see Strimmer Line Keeps Breaking – Causes and Fixes

• If the head is not rotating properly, read Strimmer Head Not Spinning – Causes and Fixes

• If the machine vibrates excessively, see Strimmer Vibrating Excessively – Causes and Fixes

When Replacement Parts May Be Needed

If cleaning and rewinding the line does not solve the problem, replacement parts may be required.

Common parts associated with feeding issues include:

• spools

• spool covers

• bump-feed mechanisms

• complete strimmer heads

• replacement nylon line

Replacing worn parts can restore smooth and reliable operation.

You can find replacement strimmer spools, heads, covers, and line for many popular brands from Yourspares.

Preventing Strimmer Line Feeding Problems

Regular maintenance can help prevent feeding issues.

Helpful tips

• Use the correct line diameter

• Avoid overfilling the spool

• Clean the strimmer head regularly

• Replace worn spools promptly

• Store line in a dry location

Final Thoughts

If your strimmer line is not feeding properly, the cause is often a worn spool, incorrectly wound line, or a blockage inside the head assembly.

By checking these common issues first, you can usually restore normal operation quickly and get back to maintaining your garden.

If replacement parts are needed, fitting the correct spool, head, or line can keep your strimmer performing at its best.

Related Garden Equipment Advice

• Strimmer Line Keeps Breaking – Causes and Fixes

• Strimmer Head Not Spinning – Causes and Fixes

• Electric Strimmer Won't Start – Causes and Fixes

• Petrol Strimmer Won't Start – Causes and Fixes

• How to Replace a Strimmer Spool

• How to Wind Strimmer Line Correctly