Easy
15-30 minutes
Genuine Husqvarna replacement part, this part is sold individually.
The 503939601 Air Purge does just what the part name says.
It purges the air out of the carburetor.
Then it forces fuel from the fuel tank and fuel line in to the carburetor.
Air Purge 503936601
OEM part for: Husqvarna
Part Number: 503936601
$14.29
In Stock
Ships within 1 business day 
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Product Description ?
- Classification: Part
- Weight: 0.01 lbs.
- Also Known As: Purge Bulb, Plunger, Purge Bubble, Purger Bulb, Primer Bulb
- Shipping: Ships Worldwide
Frequently Purchased Together ?
Compatibility
This Air Purge will fit the following 704 machines. Confirm this part works with your model, and view the detailed model diagrams and repair help we have to offer.
Displaying 20 of 704 matching models.
Husqvarna
Show More Compatible Models704 total model matches. Try the above search to narrow your results.
This is the official OEM part for the following brands:
- Husqvarna
- Jonsered
This item works with the following types of products:
- Blower
- Chain Saw
- Edger
- Hedge Trimmer
- Pole Saw
- Pruner
- Saw
- Trimmer
Customer Part Reviews ?
Average Rating (out of 5):
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5 stars
19
4 stars
1
3 stars
0
2 stars
0
1 stars
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Easy repair great fit
These air purges are the most frequent repairs I have on all my gasoline equipment. This one came quickly, fit well, was easy to put in, and has me up and running again.
Raymond -
September 29, 2023
Verified Purchase
Fixed
Perfect fit
Richard -
August 25, 2023
Verified Purchase
Chainsaw repair
Part came in on time and fit perfectly!
Guest -
June 12, 2023
Verified Purchase
Simple but essential
This part is simple but essential to priming and starting the tool. It has a limited three to four year lifespan, but replacement is easy, especially with the fast shipping, exact part and minimal cost.
Guest -
May 10, 2022
Verified Purchase
Easy, Fast Order, Perfect Part
Great and fast service. Part was perfect and easy to order.
Danny -
June 29, 2021
Verified Purchase
Air Purge
Arrived very fast and fit perfectly. My ice auger runs again.
Guest -
February 8, 2021
Verified Purchase
Just what was needed
The original primer bulb was cracked and made the saw impossible to start since it couldn't be primed. Getting to the bulb to replace it on a K760 gas saw takes a little bit of work. You have to pull off the top pieces and loosen the carburetor to get to the fuel lines with needle nose pliers. Once there the bulb pops right out and the new one snaps right in. Push on the fuel lines and re-bolt the pieces back on and you're done. A few pushes on the bulb to get the gas flowing and the saw started right up. Just what the saw needed to continue it's service life. A twenty dollar part and 45 minutes time saved a $900 saw.
Thomas -
November 6, 2020
Verified Purchase
Install was easy works great !
Weed eater starts and runs perfectly.
Guest -
October 13, 2020
Verified Purchase
Perfect match
Easy to replace once housing removed
Guest -
August 20, 2020
Verified Purchase
Works perfect.
Exact fit. Quick shipping.
Stephen -
August 17, 2020
Verified Purchase
Questions & Answers ?
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Customer Repair Instructions ?
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part.
Air purge was cracked
dave - February 18, 2016
👍 34 of 35 people found this instruction helpful
Tool Type
Chain Saw
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver, Pliers
Parts Used
Remove top cowl from saw --- remove air filter from carburetor --- disconnect fuel lines from purge with pliers --- remove damaged purge by pinching keeper tabs --- snap new purge in place --- connect fuel lines --- install air filter & cowl --- voila'
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Air purge cracked due to age.
David - August 16, 2017
👍 7 of 7 people found this instruction helpful
Tool Type
Trimmer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver, Allen wrench
Parts Used
Removed engine cover.
Used small screw driver to depress the tabs on air purge.
Pulled off both fuel lines from air purge, paying attention to which one connected where.
Attached fuel lines to new air purge and snapped it in place.
It was a very easy and straightforward repair.
Used small screw driver to depress the tabs on air purge.
Pulled off both fuel lines from air purge, paying attention to which one connected where.
Attached fuel lines to new air purge and snapped it in place.
It was a very easy and straightforward repair.
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Prime bulb return line dry rotted, leaking gas.
brandon - September 11, 2016
👍 6 of 6 people found this instruction helpful
Tool Type
Chain Saw
Difficulty
Hard
Time
1-2 hours
Tools Used
Screwdriver, Pliers, Nutdriver, Two picks, one straight, one 90 degrees, knife
1. Remove chain and bar( for easy maneuverability), empty gas in tank, then top cover, followed by handle and throttle grip. The throttle has to be disconnected from carb, and you have to spin the linkage to remove because it does not come straight out.
2. You can choose to remove carb, I was able to do repair without removing, probably more difficult, but might have saved a little time. I removed return line and fuel lines and prime bulb from saw, followed by grommets. To remove fuel line you have to open gas tank and pull out filter and fuel line with your 90 degree pick. Remove filter and hose, replace with new.
3. When I replaced grommets and hose, I put a little oil on them to make things go on a little easier. I found it is easier to install grommets on hose first and then install grommets on saw. You can always push and pull hose through.
4. Once all hoses are on and secure, reinstall your filter on line and replace inside tank. I cut about two inches off the tank line before installing filter, just because it seemed a little long, your choice. I only had one line that was bad, but I figured while I was replacing one, might as well do them all, the others are probably going to fail soon.
5. In order to replace exhaust screen, you will have to remove chain break handle, two hex head bolts, slide screen out, slide new one in and done.
6. Once installed, I reassembled everything in the reverse order it come out. Chain brake handle, main handle then throttle cover, remember to install throttle linkage, you have to spin it to get back next to the carb, this can be a little tedious, but make sure it is where it needs to go before bolting main handle on, or you have to take it apart again(my mistake).
7. After throttle cover, replace your top cover, and chain and bar, add gas and your good to go.
2. You can choose to remove carb, I was able to do repair without removing, probably more difficult, but might have saved a little time. I removed return line and fuel lines and prime bulb from saw, followed by grommets. To remove fuel line you have to open gas tank and pull out filter and fuel line with your 90 degree pick. Remove filter and hose, replace with new.
3. When I replaced grommets and hose, I put a little oil on them to make things go on a little easier. I found it is easier to install grommets on hose first and then install grommets on saw. You can always push and pull hose through.
4. Once all hoses are on and secure, reinstall your filter on line and replace inside tank. I cut about two inches off the tank line before installing filter, just because it seemed a little long, your choice. I only had one line that was bad, but I figured while I was replacing one, might as well do them all, the others are probably going to fail soon.
5. In order to replace exhaust screen, you will have to remove chain break handle, two hex head bolts, slide screen out, slide new one in and done.
6. Once installed, I reassembled everything in the reverse order it come out. Chain brake handle, main handle then throttle cover, remember to install throttle linkage, you have to spin it to get back next to the carb, this can be a little tedious, but make sure it is where it needs to go before bolting main handle on, or you have to take it apart again(my mistake).
7. After throttle cover, replace your top cover, and chain and bar, add gas and your good to go.
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Would not start cracked air purge bulb
Ted - February 25, 2017
👍 3 of 3 people found this instruction helpful
Tool Type
Trimmer
Difficulty
Easy
Time
15-30 minutes
Tools Used
, allen wrench
Parts Used
Removed rope starter mechanism to gain access to air purge.
Note the purge bulb is clocked so it will only seat in one direction.
reassembled.
Note the purge bulb is clocked so it will only seat in one direction.
reassembled.
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Leaking gas, and would not run for a full min.
william - June 30, 2016
👍 2 of 3 people found this instruction helpful
Tool Type
Trimmer
Difficulty
Medium
Time
30-60 minutes
Tools Used
Screwdriver, Socket set, Wrench Set
Parts Used
Pulled starter recoil
Pulled bottom plate
Removed gas tank
Removed fuel line and air purge line
Replaced purge bubble
Reinstalled all other parts
Pulled bottom plate
Removed gas tank
Removed fuel line and air purge line
Replaced purge bubble
Reinstalled all other parts
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Primer punctured
Michael - July 30, 2016
👍 1 of 1 people found this instruction helpful
Tool Type
Trimmer
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver, Pliers
Parts Used
1. Removed screws for the frame
2. Pulled out old primer
3. Removed two fuel lines
4. Placed in the new primer and connected both fuel lines
5. Placed frame back on and screwed in.
2. Pulled out old primer
3. Removed two fuel lines
4. Placed in the new primer and connected both fuel lines
5. Placed frame back on and screwed in.
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Trimmer would not stay running
kellen - June 13, 2018
Tool Type
Trimmer
Difficulty
Easy
Time
30-60 minutes
Tools Used
Pliers, Allen wrenches
1. Took pictures before I took it apart.
2. Removed all the plastic.
3. Removed the tank.
4. Replaced the hoses and filter on the tank.
5. Replaced the fuel primer on the main unit.
6. Mounted the new hoses to the new carburetor.
7. Removed the old carburetor.
8. Installed the new carburetor and gasket to the trimmer.
9. Reinstalled the tank and all the plastic.
10. Started the trimmer and made adjustments to the carburetor.
11. Installed the carburetor stops to the Jets.
2. Removed all the plastic.
3. Removed the tank.
4. Replaced the hoses and filter on the tank.
5. Replaced the fuel primer on the main unit.
6. Mounted the new hoses to the new carburetor.
7. Removed the old carburetor.
8. Installed the new carburetor and gasket to the trimmer.
9. Reinstalled the tank and all the plastic.
10. Started the trimmer and made adjustments to the carburetor.
11. Installed the carburetor stops to the Jets.
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Purge bulb had a leak
Elizabeth - June 12, 2018
Tool Type
Trimmer
Difficulty
Easy
Time
15-30 minutes
Tools Used
Pliers, Tweezers
Parts Used
1. Removed cover
2. Disconnected fuel lines from old bulb
3. Removed old bulb
4. Positioned new bulb, and reconnected fuel lines
5. Replaced cover
2. Disconnected fuel lines from old bulb
3. Removed old bulb
4. Positioned new bulb, and reconnected fuel lines
5. Replaced cover
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Purge bulb broken and lost
Charles - December 20, 2017
Tool Type
Blower
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
, Knife
Parts Used
Removed old primer bulb base, noted tube connections, replaced the hoses and pushed new primer base back into place. Tested and all parts worked perfectly!
Easy as pie, anyone could complete this repair and save $100+ bill.
Easy as pie, anyone could complete this repair and save $100+ bill.
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Fuel line had hardened and split. Could not prime carburetor.
Michael - October 22, 2017
Tool Type
Trimmer
Difficulty
Medium
Time
30-60 minutes
Tools Used
, 5/32 hex key
1. Dismantled outer cover and pull rope assembly to allow fuel tank to come loose.
2. Had ordered all fuel lines, fuel filter, primer bubble, and air filter from eReplacementParts, not just the one fuel line that had split.
3. Was a wise choice because another fuel line split during disassembly.
4. Model 322L trimmer fuel filter must first be pulled from fuel tank and cut off before fuel line can be removed. Be careful not to disrupt the rubber bushings in the fuel tank the fuel lines pass through. I had not ordered those. The bushings seal the fuel lines to prevent leaks. Mine didn't leak, but I had known, it would have been a good idea to have ordered the tank bushings as a good measure and reassurance you get no leaks.
5. When replacing all fuel lines remember to make a sketch where each fuel line connects. This is important. I should have listed this first. Two lines go to the carburetor and to go to the primer bubble. Don't trust your memory. Make the sketch.
6. The longer fuel line must be pushed into the tank and brought out the fuel cap opening first before you install the filter. Push the fuel filter and rest of fuel line back into the tank. Some fuel line may have to be trimmed.
7. I replaced the other fuel lines trimming off excess, making sure there were no kinks or pinched segments.
8. I reassembled the fuel tank making sure the tank tabs fit snugly into their respective slots on the trimmer body as well as the pull rope assembly. All the while making sure the fuel lines remained routed properly.
9. Finally I verified none of the fuel lines had come undone and reassembled the outer housing. The carburetor air filter was shipped pre oiled and was easily installed.
10. I installed a new spark plug that I had purchased locally.
Pay attention to the assembly before servicing. Clean your trimmer while it's apart with rags and WD40 or some other oil solvent cleaner.
I started the trimmer and it ran great. No leaks from fuel system. Ready to go.
2. Had ordered all fuel lines, fuel filter, primer bubble, and air filter from eReplacementParts, not just the one fuel line that had split.
3. Was a wise choice because another fuel line split during disassembly.
4. Model 322L trimmer fuel filter must first be pulled from fuel tank and cut off before fuel line can be removed. Be careful not to disrupt the rubber bushings in the fuel tank the fuel lines pass through. I had not ordered those. The bushings seal the fuel lines to prevent leaks. Mine didn't leak, but I had known, it would have been a good idea to have ordered the tank bushings as a good measure and reassurance you get no leaks.
5. When replacing all fuel lines remember to make a sketch where each fuel line connects. This is important. I should have listed this first. Two lines go to the carburetor and to go to the primer bubble. Don't trust your memory. Make the sketch.
6. The longer fuel line must be pushed into the tank and brought out the fuel cap opening first before you install the filter. Push the fuel filter and rest of fuel line back into the tank. Some fuel line may have to be trimmed.
7. I replaced the other fuel lines trimming off excess, making sure there were no kinks or pinched segments.
8. I reassembled the fuel tank making sure the tank tabs fit snugly into their respective slots on the trimmer body as well as the pull rope assembly. All the while making sure the fuel lines remained routed properly.
9. Finally I verified none of the fuel lines had come undone and reassembled the outer housing. The carburetor air filter was shipped pre oiled and was easily installed.
10. I installed a new spark plug that I had purchased locally.
Pay attention to the assembly before servicing. Clean your trimmer while it's apart with rags and WD40 or some other oil solvent cleaner.
I started the trimmer and it ran great. No leaks from fuel system. Ready to go.
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All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part. While we moderate these reviews for profanity, offensive language or personally identifiable information, these reviews are posted exactly as submitted and no alterations are made by our team.
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