188-512-1 Primer Bulb for Poulan 530047721 PP136 PP330 Echo Chainsaw Ryobi Homelite Bolens String Trimmer Leaf Blower - 6 Pack

503936601 / 188-512-1 Primer Bulb

Key Features

• Package contains 6 primer bulbs.
• Snap-in design for direct replacement.
• Constructed from fuel-resistant polymer to prevent hardening and cracking.
• Dimensions: Approximately 1-5/16 in (height) x 7/8 in (outer diameter).
• For use with 2-cycle small engines to assist with cold starts.

Replaces / Cross-Reference Part Numbers

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

Compatibility & Fitment

• Fits Brands:
  • Poulan
  • Ryobi
  • Echo
  • Homelite
  • Bolens
  • Husqvarna
• Fits Equipment:
  • String Trimmers
  • Leaf Blowers
  • Chainsaws
  • Brush Cutters
• Fits Walbro Carburetor Models:
  • WT-23A
  • WYJ-33
  • WYJ-34
  • WYJ-45
  • WYJ-92
  • WYJ-94
• Select Confirmed Models:
  • Poulan: PP136, PP136E, PP330, PPB100E, PPB150E, PPB200, PPB250E, PPB300E, PPB350
  • Ryobi: BP42
  • Husqvarna: K750, K760

When to Replace

• The existing bulb is cracked, brittle, or has turned opaque.
• The bulb does not return to its original shape after being pressed.
• Fuel is leaking from or around the primer bulb.
• The engine is difficult to start and fails to draw fuel.

Installation Tips

• Disconnect the spark plug wire for safety before performing service.
• Observe or photograph the fuel line connections before disassembly.
• Use small pliers to remove the retaining clip and old bulb.
• Clean the carburetor housing surface before installing the new bulb.
• Ensure the new bulb is fully seated to create a proper seal.
• Reconnect the fuel lines to the correct inlet and outlet ports.