unsolicited
01.05.2021 0:19:16
Re: Fuel primer bulb collapsing
See full version: Fuel primer bulb collapsing
Re: Fuel primer bulb collapsing
Crud in the tank isn't going to fix itself, and it seems to multiply if you try to filter it out. Sounds like a real serious cleaning, maybe even pulling the tank is needed. Been there meself once.
Although im no expert, id bet you have an obstruction either IN your gas tank, OR in the pickup. Dollars to cents. To me it seems youve found the problem, its in the tank, hand pressing the bulb will not create the same amount of suction from a fuel pump running anything near planeing speed, I think the previous post,about hooking up a jerry can is the best way to go to ABSOLUTELY know its the tank. Just my .02 . Let us know how it works out.
Re: Fuel primer bulb collapsing more
At this point, it's pure speculation since no testing has been performed. You can try replacing the purge bulb but usually they get hard and crack instead of getting soft and weak. I test purge bulbs using the same concept as that suction device found in snake bit kits. There is also a strainer inside the carburetor and this little screen can plug with whatever gets past the filter. Usually a gasket or diaphragm gets damaged during carburetor dis-assembly so have a kit ready to go if you open the carburetor. Your saw has a WT-589A carburetor and takes a D10-WAT G&D kit. Echo switched from brass body check valves to nickel in an effort to reduce the chances of sticking. Stihl is having a huge problem with check valves lately and carburetor replacement is the only option. I usually recommend the no-cost checks & tests first to rule them out. I don't condone parts replacement for the sake of parts replacement.
If you have the tools and want to do a few tests then watch this video: www.youtube.com/watch?v=iOwhMFx8wp0
The procedure in the video shows how to test the check valves. In your case the check valves are mounted in the carburetor body and are not serviceable. Do not use carburetor cleaner on the check valves. In some rare cases an ultrasonic cleaner has helped stuck check valves but only if you already own one.
At this point, it's pure speculation since no testing has been performed. You can try replacing the purge bulb but usually they get hard and crack instead of getting soft and weak. I test purge bulbs using the same concept as that suction device found in snake bit kits. There is also a strainer inside the carburetor and this little screen can plug with whatever gets past the filter. Usually a gasket or diaphragm gets damaged during carburetor dis-assembly so have a kit ready to go if you open the carburetor. Your saw has a WT-589A carburetor and takes a D10-WAT G&D kit. Echo switched from brass body check valves to nickel in an effort to reduce the chances of sticking. Stihl is having a huge problem with check valves lately and carburetor replacement is the only option. I usually recommend the no-cost checks & tests first to rule them out. I don't condone parts replacement for the sake of parts replacement.
If you have the tools and want to do a few tests then watch this video: www.youtube.com/watch?v=iOwhMFx8wp0
The procedure in the video shows how to test the check valves. In your case the check valves are mounted in the carburetor body and are not serviceable. Do not use carburetor cleaner on the check valves. In some rare cases an ultrasonic cleaner has helped stuck check valves but only if you already own one.
Actually, there are several possible causes as to why the purge bulb does not return and you certainly found the cause. Good job!
Wait a minute. I should get the prize - see post #6. Just pickin'
Actually, there are several possible causes as to why the purge bulb does not return and you certainly found the cause. Good job!