Husqvarna 503936601 Air Purge Bubble | OEM Primer Bulb

Husqvarna 503936601 Air Purge Bubble | OEM Primer Bulb

Product Number: 503936601

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Product Brand: Husqvarna
Product Type: Parts

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Husqvarna 503936601 Air Purge Bubble - OEM Primer Bulb

The Husqvarna 503936601 Air Purge Bubble is a genuine OEM replacement purge bulb used on select Husqvarna and related handheld equipment. This part is commonly called an air purge bubble, primer bulb, fuel purge bulb, or carburetor purge bubble.

A worn, cracked, hard, leaking, or collapsed purge bulb can make equipment difficult to start or prevent fuel from priming correctly. Replacing the purge bubble helps restore proper fuel priming on compatible chainsaws, trimmers, brushcutters, hedge trimmers, blowers, and cut-off saws.

Always verify your full model number, model year/version, carburetor setup, original part number, and parts diagram before ordering. Do not order by model name alone.

Product Details

  • Brand: Husqvarna
  • Part Number: 503936601
  • Product Type: Air Purge Bubble / Primer Bulb / Purge Bulb
  • Common Location: Carburetor / fuel purge system
  • Common Applications: Select chainsaws, trimmers, brushcutters, hedge trimmers, blowers, pole saws, and cut-off saws
  • OEM / Aftermarket: Genuine OEM Husqvarna replacement part

Fits Select Models

This is a where-used reference list only. The Husqvarna 503936601 purge bubble fits many versions of the models below, but fitment can vary by production date, carburetor, fuel line layout, and parts diagram.

Common Husqvarna Chainsaw Models
  • 135, 135 E
  • 140, 140 E
  • 334 T, 338 XPT
  • 340, 340 E, 345, 345 E, 346 XP, 350, 353
  • 435, 435 E, 440 E, 445, 445 E, 450, 450 E
  • 455 E, 455 Rancher, 455 Rancher II
  • 460, 461
  • 545, 550 XP, 555, 560 XP, 562 XP
Common Husqvarna Trimmer, Brushcutter, and Clearing Saw Models
  • 223 L, 223 R, 232 L, 232 R
  • 235 FR, 235 R, 235 R II
  • 241 R, 241 RJ
  • 323 C, 323 L, 323 LD, 323 R, 323 RII, 323 RJ
  • 325 C X, 325 CX, 325 Lx, 325 LDx, 325 RX, 325 RJX, 325 RD
  • 326 C, 326 L, 326 Lx, 326 LDx, 326 LS, 326 RJX, 326 RX
  • 327 LDx, 327 LS, 327 Lx, 327 RDX, 327 RJX, 327 RX
  • 333 R, 333 RJ
  • 335 FR, 335 LS, 335 LX, 335 R, 335 RJX, 335 RX
  • 336 FR, 336 FRD
  • 343F, 343FR, 343R
  • 345 FR, 345 FX, 345 FXT, 345 RX, 345R
  • 355 FX, 355 FXT, 355 RX, 355FRM
  • 535 FBX, 535 LS, 535 RJ, 535 RX, 535 RXT
  • 545 FX, 545 FXT, 545 RX, 545 RXT
  • 555 FRM, 555 FX, 555 FXT, 555 RXT
Common Hedge Trimmer, Edger, Pole Saw, and Attachment Models
  • 323 Ex, 323 HD60, 323 HE3, 323P
  • 325 HD60, 325 HD75, 325 HDA55, 325 HDA65, 325 HE3, 325 HE4, 325 HS75, 325 HS99, 325P
  • 326 ES, 326 HD60, 326 HD75, 326 HDA55, 326 HE3, 326 HE4, 326P, 326P5
  • 327 ES, 327 HDA65, 327 HE3, 327 HE4, 327 PT5S, 327P
  • HA 110, HA 850
  • Hedge trimmer attachments HA110 and HA850 where specified
  • Saw attachment models where specified
Common Blower and Cut-Off Saw Models
  • 225 B, 225 HBV
  • 356 BF, 356 BT
  • K750
  • K760
Common Jonsered Model References
  • BC2125, BC2145, BC2235, BC2236, BC2255, BC2256
  • CC2036, CC2145, CC2235, CC2236, CC2245
  • CS2135 T, CS2139 T, CS2141, CS2145, CS2150, CS2152, CS2153
  • CS2240, CS2240 S, CS2245, CS2245 S, CS2250 S
  • CS2252, CS2253, CS2255, CS2258, CS2260, CS2260 WH
  • CS350, CS390, CS410, CS450
  • FC2145, FC2245, FC2255, FC2256
  • GC2125, GC2236, GR2032, GR2036, GT2125
  • MC2255, MC2256
Quick Model Search List

Common model searches include:

  • 135, 135E, 140, 140E, 223L, 223R, 225B, 225HBV, 232L, 232R
  • 235FR, 235R, 241R, 323L, 323R, 325L, 325RX, 326L, 326RX, 327RX
  • 333R, 335RX, 336FR, 343R, 345FX, 345RX, 355FX, 535RX, 545FX, 555FX
  • 334T, 338XPT, 340, 345, 346XP, 350, 353, 435, 440E, 445, 450
  • 455 Rancher, 460, 461, 545, 550XP, 555, 560XP, 562XP
  • K750, K760
  • CS2240, CS2245, CS2250, CS2252, CS2253, CS2255, CS2258, CS2260

Key Features

  • Genuine OEM Husqvarna air purge bubble
  • Part number 503936601
  • Also commonly called a primer bulb or purge bulb
  • Used on many select Husqvarna and Jonsered handheld equipment models
  • Helps prime fuel through the carburetor fuel system
  • Factory-correct replacement when listed in your parts diagram

When to Replace an Air Purge Bubble

  • Primer bulb is cracked, hard, leaking, or collapsed
  • Fuel will not pull into the purge bulb
  • Equipment is hard to start after sitting
  • Bulb does not return to shape after pressing
  • Fuel lines are being replaced and the purge bulb is aged
  • Your parts diagram lists Husqvarna 503936601

Important Fitment Notes

  • This listing is for Husqvarna part number 503936601
  • Fits select models only
  • Verify the full model number, production date/version, and parts diagram before ordering
  • Check carburetor style, fuel line routing, purge bulb shape, and mounting setup
  • Do not order by model name alone because many models had multiple versions

Pre-Purchase Checklist

Before ordering Husqvarna 503936601, confirm:

  • Your full model number
  • Your model year or production version
  • Your parts diagram lists 503936601
  • Your purge bulb shape and fuel line routing match the original
  • Your fuel lines, fuel filter, carburetor, and tank grommet are inspected for wear or leaks

Installation and Service Notes

Air purge bubble replacement should be performed with the engine off, ignition disabled, and the equipment cool. Work in a clean, well-ventilated area and handle fuel safely.

  • Take a photo of the original fuel line routing before removal
  • Inspect fuel lines for cracking, stiffness, swelling, or leaks
  • Inspect the fuel filter and tank grommet while servicing the purge system
  • Install the purge bulb in the same orientation as the original
  • Prime the fuel system and check for leaks before operation
  • Replace damaged fuel lines or filters as needed

Part Number / Search Terms

  • Husqvarna 503936601
  • 503936601 air purge bubble
  • 503936601 primer bulb
  • 503936601 purge bulb
  • Husqvarna air purge bubble
  • Husqvarna primer bulb
  • Husqvarna purge bulb
  • Husqvarna fuel purge bulb
  • Husqvarna carburetor purge bubble
  • Jonsered primer bulb
  • Jonsered purge bulb
  • OEM Husqvarna primer bulb

Frequently Asked Questions

What is Husqvarna 503936601?

Husqvarna 503936601 is a genuine OEM air purge bubble, also commonly called a primer bulb or purge bulb.

What does an air purge bubble do?

The purge bubble helps move fuel through the carburetor fuel system for easier starting on compatible handheld equipment.

Does this fit every Husqvarna model listed by name?

No. Many Husqvarna models were made in multiple versions. Always verify your exact model, production date, carburetor setup, and parts diagram before ordering.

Should I replace fuel lines with the purge bulb?

Inspect the fuel lines, fuel filter, and tank grommet during replacement. Replace any line that is cracked, stiff, swollen, or leaking.

P&P Small Engines stocks genuine Husqvarna primer bulbs, fuel lines, fuel filters, carburetor parts, spark plugs, air filters, chainsaw parts, trimmer parts, and OEM replacement parts for handheld outdoor power equipment.