RedMax Brand 503936601 188-512 Primer Bulb Fuel Lines Tune-Up Kit for Husqvarna Trimmer, Chainsaw - 4 Pack
Set of four primer bulbs and yellow fuel lines for Husqvarna trimmers and chainsaws.
Tune-up kit including 4 primer bulbs and 4 yellow fuel lines for Husqvarna trimmers and chainsaws.
Close-up of a 188-512 primer bulb for Husqvarna trimmers and chainsaws with informational text overlay.
Dimensional diagram showing measurements for 503936601 primer bulb compatible with Husqvarna trimmers and chainsaws.
Close-up of 503936601 primer bulb for Husqvarna trimmers and chainsaws, highlighting durable PP construction.
Two replacement primer bulbs for Husqvarna trimmers and chainsaws to fix engine starting and fuel leak issues.
Close-up of a 188-512 primer bulb replacement part for Husqvarna trimmers and chainsaws with compatibility chart.
Compatibility chart for 503936601 primer bulb fuel line kit listing Husqvarna and Poulan trimmer models.
Instructional graphic showing 5-minute installation steps for a Husqvarna chainsaw primer bulb and fuel line kit.
Set of four primer bulbs and yellow fuel lines for Husqvarna trimmers and chainsaws.
Tune-up kit including 4 primer bulbs and 4 yellow fuel lines for Husqvarna trimmers and chainsaws.
Close-up of a 188-512 primer bulb for Husqvarna trimmers and chainsaws with informational text overlay.
Dimensional diagram showing measurements for 503936601 primer bulb compatible with Husqvarna trimmers and chainsaws.
Close-up of 503936601 primer bulb for Husqvarna trimmers and chainsaws, highlighting durable PP construction.
Two replacement primer bulbs for Husqvarna trimmers and chainsaws to fix engine starting and fuel leak issues.
Close-up of a 188-512 primer bulb replacement part for Husqvarna trimmers and chainsaws with compatibility chart.
Compatibility chart for 503936601 primer bulb fuel line kit listing Husqvarna and Poulan trimmer models.
Instructional graphic showing 5-minute installation steps for a Husqvarna chainsaw primer bulb and fuel line kit.

503936601 188-512 Primer Bulb Fuel Lines Tune-Up Kit for Husqvarna Trimmer, Chainsaw - 4 Pack

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$17.02
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$17.02
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503936601 / 188-512 Primer Bulb with Fuel Lines

Key Features

  • Package includes 4 primer bulb assemblies and 4 fuel lines.
  • Direct replacement for specified part numbers.
  • Snap-in design for straightforward installation.
  • Bulb primes the carburetor to assist with cold starts.

Replaces / Cross-Reference Part Numbers

  • 503936601
  • 530047721
  • 188-512
  • 188-512-1
  • 01183
  • 791-683974

Compatibility & Fitment

  • Brand: Husqvarna
  • Chainsaw Models: 235, 236, 240, 340, 345, 350, 353, 435, 440, 445, 450, 455, 455 Rancher, 460
  • Blower Models: 125B, 125BX, 125BVX, 225BX, 225HBV, 356BF, 356BT
  • Trimmer Models: 123L
  • Power Cutter Models: K750, K760

When to Replace

  • Primer bulb is cracked, hazy, or brittle.
  • Bulb does not return to its original shape after being pressed.
  • Engine is difficult to start or requires excessive priming.
  • Visible fuel leaks from or around the bulb assembly.
  • Fuel lines are clogged, cracked, or have deteriorated.

Installation Tips

  • Drain all fuel from the tank before beginning work.
  • Note the orientation and routing of the old fuel lines before removal.
  • Ensure the new primer bulb snaps securely into the housing to prevent leaks.
  • Cut new fuel lines to match the length of the original lines.
  • After installation, prime the bulb and check for any fuel leaks before starting the engine.
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  • WIDE COMPATIBILITY

    WIDE COMPATIBILITY

    Compatible with many models of Stihl, Homelite, Craftsman, Poulan Lawn Mower, String Trimmer, Chainsaw WeedEater Generator
  • DURABLE MATERIAL

    DURABLE MATERIAL

    This part is made of sturdy material which is flexibility and flame-retardant, enhancing durability
  • SAVING SOLUTION

    SAVING SOLUTION

    Enjoy the great feeling when your engine is repaired and works properly like before - BlueStars brings DIY solutions to help you deal with any trouble
  • IMPORTANT NOTE

    IMPORTANT NOTE

    This is a replacement part designed to be compatible with certain appliances. Any brand names mentioned are used solely to indicate compatibility
THE REPLACEMENT PART THAT KEEP YOUR YARD LOOKING FRESH!

THE REPLACEMENT PART THAT KEEP YOUR YARD LOOKING FRESH!

Compatible Models

Locate the model number of your appliance or equipment on the manufacturer's label and use it to check compatibility before ordering

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FAQs

This kit is compatible with a wide range of Husqvarna equipment, including trimmers (123L, 225, 232L, 227L, 240L, 322L, 323, 325, 326), chainsaws (235, 236, 240, 340, 345, 350, 353, 440, 445, 450, 460), and blowers (125B, 125BX, 125BVX, 225BX, 225HBV, 356BF, 356BT), as well as K760 and K750 cut-off saws.
This primer bulb replaces OEM part number 503936601 and cross-references with 188-512, 188-512-1, and 530047721.
You likely need a replacement if the primer bulb has become cracked, brittle, or fails to draw fuel into the carburetor when pressed. Additionally, if you notice fuel leaking around the bulb or if the fuel lines have become stiff, discolored, or show signs of dry rot, they should be replaced to ensure the engine receives a consistent fuel supply.
The primary cause of failure is the degradation of rubber components due to ethanol-blended fuels. Ethanol can cause rubber fuel lines and primer bulbs to harden, crack, or lose their elasticity, which leads to air leaks and poor engine performance. Regular exposure to heat and UV light also accelerates this aging process.
While replacing the primer bulb and fuel lines, it is a good practice to inspect the fuel tank grommet for cracks and ensure the fuel filter inside the tank is clean. If the engine is still struggling to run after replacing these parts, you may also want to inspect the carburetor for internal blockages or consider cleaning the air filter.
Installation is straightforward and typically takes about 15 to 30 minutes. You will generally need a pair of needle-nose pliers to remove the old fuel lines and seat the new bulb. When installing the new lines, ensure they are cut to the appropriate length for your specific model and that they are routed correctly to avoid kinking or pinching.