bellarmine
ArboristSite Lurker
Hello All,
I'm having trouble with another of my neighbor's saws, a Poulan 305, black and yellow, 49cc with a Walbro HDA-49 carb. Has a thin 20" bar on it....(!) It has run erratic since we got it, even after a brand new carb kit.
It has 2 fuel hoses, both going into the fuel tank. There is no primer, and no pulse hole in the intake boot. The hose at the side of the carb is the fuel inlet with the in-tank filter. There is another at the top of the carb which I am almost sure is the pump pulse line, and dangles inside the tank.
Something here appears to me to be wrong, how would the fuel pump work this way, is the tank pressurized? The lines have been replaced. If it is indeed wrong how come it starts and runs at all?...??..:^) I appear to see some nubbin thing on the crankcase, have to take more apart to see, is that where the hose is supposed to go?
While it's running I pull the pump pulse line right out of the tank, absolutely no change. Since the new carb kit it now starts pretty well, but after much jockeying of the mixture screws (several turns out each), it either idles and then dies when giving it throttle, or can get it throttled up to full speed and it runs screaming away, but minute you turn down the idle it dies. Every start is different.
Hope you can help me with this head-scratcher. Let me know if you need further info or a photo or two. Thanks and Cheers!~
Bellarmine
I'm having trouble with another of my neighbor's saws, a Poulan 305, black and yellow, 49cc with a Walbro HDA-49 carb. Has a thin 20" bar on it....(!) It has run erratic since we got it, even after a brand new carb kit.
It has 2 fuel hoses, both going into the fuel tank. There is no primer, and no pulse hole in the intake boot. The hose at the side of the carb is the fuel inlet with the in-tank filter. There is another at the top of the carb which I am almost sure is the pump pulse line, and dangles inside the tank.
Something here appears to me to be wrong, how would the fuel pump work this way, is the tank pressurized? The lines have been replaced. If it is indeed wrong how come it starts and runs at all?...??..:^) I appear to see some nubbin thing on the crankcase, have to take more apart to see, is that where the hose is supposed to go?
While it's running I pull the pump pulse line right out of the tank, absolutely no change. Since the new carb kit it now starts pretty well, but after much jockeying of the mixture screws (several turns out each), it either idles and then dies when giving it throttle, or can get it throttled up to full speed and it runs screaming away, but minute you turn down the idle it dies. Every start is different.
Hope you can help me with this head-scratcher. Let me know if you need further info or a photo or two. Thanks and Cheers!~
Bellarmine
