GolfVenture Posted October 3, 2014 #1 Posted October 3, 2014 I can get it started but it seems to use the fuel in the carb then dies. The plastic pumper pumps. Can those little pump go bad and not let fuel to be sucked up by the carb, but pumps when pressed?
Peder_y2k Posted October 3, 2014 #2 Posted October 3, 2014 Check the fuel lines that are inside the fuel tank. Also check all fuel lines for cracks. I've got a string trimmer where the little bulb has a big split and leaks fuel badly, but the engine still starts on full choke and runs fine.........just more pulls to start. McClendon's has small fuel lines .....and maybe replacement squeeze bulbs. -Pete, in Tacoma WA USA
Cruiser1021 Posted October 3, 2014 #3 Posted October 3, 2014 There may be a spark arestor screen in the outlet of the muffler. They sometimes get plugged up. Remove it and clean it with a wire brush and reinstall.
Woody Posted October 3, 2014 #4 Posted October 3, 2014 could be a lot of different things and most brought on by the gas we are stuck with. usually end up taking carb apart and cleaning with carb cleaner. sometimes it will be the fuel line but since it will crank it is more likely the carb has lacquered up. once you get it running put a little seafoam in your gas can to treat whole thing while you work.
Flyinfool Posted October 3, 2014 #5 Posted October 3, 2014 My chainsaw had no OEM fuel filter. I ended up cleaning a bunch of crud out of the carb. There is a fuel pump built into the carb, it is a diaphragm and two small flapper valves. This is not the same thing as the pump bulb for priming the carb. Any crud in either of the flapper valves will prevent it from pumping fuel. If the pump is not pumping then it will just burn off the prime from the bulb pump. In a chainsaw there is a lot of sawdust around that can get in there. Mine now has a fuel filter. I have also seen the gas line get hard with age. If this happens then the pickup will not be free to flop around and follow the gas as you move the saw into various positions.
cowpuc Posted October 3, 2014 #6 Posted October 3, 2014 May be a fuel pump diaphram, seems like most chainsaws I have worked on have a little vacuum operated fuel pump built into the carb,, kinda like the tillotson carbs on the old snowmobiles. Diaphram may be cracked or the orfices that feed it get plugged up.. The little primer push button bypasses the pump and shoots fuel directly into the carb, sounds like its burning off that fuel and the carb itself isnt getting any.. Another thing is, because those carb orfices (Hi and low and fuel inlet) are so tiny, when a chainsaw sets for a long time and is not used the gas will dry up leaving a gummy 2 stroke oil paste left behind.. Checking all those lines for cracks as mentioned is also a really good idea as is checking the line inside of your tank (should be a little weighted screen on the end of it). You could try removing the air cleaner and holding your thumb over the carb throat, give her a couple pulls an see if you can get fuel moving before ripping it all apart. If you do remove the carb and rebuild it make sure you have all the gaskets and diaphrams ect lined up properly.. There may be little passage ways thru them that will have to be lined up for air or fuel flow.. I had one once that gave me fits and found out it was crank seals that were causing the problems (causes loss of vacuum and it messes up the fuel/air mix/ WILL burn it down from running lean if you run it like this).. Depending on age of saw/how much run time - this is possible.. Come to think of it,, another newer saw that I worked on once used pressure inside the tank as a means of forcing fuel into the carb,, hmmmmmm,,, maybe check the o-ring on the tank cap and see if its sealing good if yours is one of this type.. Also, remember when tuning it after you get it running to replace the air filter assembly before you tune it.. They have a tiny carb throat and the filter will cause it to richen up a little.. Those little suckers can be finicky BUT,, sure beats a hand saw when cutting wood!!
cowpuc Posted October 3, 2014 #7 Posted October 3, 2014 My chainsaw had no OEM fuel filter. I ended up cleaning a bunch of crud out of the carb. There is a fuel pump built into the carb, it is a diaphragm and two small flapper valves. This is not the same thing as the pump bulb for priming the carb. Any crud in either of the flapper valves will prevent it from pumping fuel. If the pump is not pumping then it will just burn off the prime from the bulb pump. In a chainsaw there is a lot of sawdust around that can get in there. Mine now has a fuel filter. I have also seen the gas line get hard with age. If this happens then the pickup will not be free to flop around and follow the gas as you move the saw into various positions. I mean sheesh Flyinfool,, give a guy a chance to finish typing will ya
Mike G in SC Posted October 3, 2014 #8 Posted October 3, 2014 (edited) I use my Stihl every couple of years,,, so I offered it to a friend if he would buy me a good quality electric. He likes it. My new WORX is still in the box, 2 months later. But my yard is only 3/4 acre,,, so a 100' cord can cut anything I need. He's got 7 acres, so he's "happy as a camel on Wednesday". Not worried about bad gas no more. If I decide to be a lumberjack when I retire next May,,,, "I may have to re-think this thing". Mike Mike Mike Edited October 3, 2014 by Mike G in SC
Sylvester Posted October 3, 2014 #9 Posted October 3, 2014 Ethanol in gas will eat the fuel lines. My Stihl hedge trimmer is down waiting on parts that dissolved.
Sailor Posted October 3, 2014 #10 Posted October 3, 2014 My chainsaw would run for a while then quit. The vent tube was plugged. This created a vacuum as the gas was pumped out and the gas quit flowing. Another time it was the filter on the fuel pickup in the tank that was plugged. Both times just cleaned them and they worked fine.
Flyinfool Posted October 3, 2014 #11 Posted October 3, 2014 I mean sheesh Flyinfool,, give a guy a chance to finish typing will ya I gave ya 49 minutes, how much chance ya want........:rasberry:
GolfVenture Posted October 4, 2014 Author #13 Posted October 4, 2014 I am able to keep it going by pushing on the plastic primer pump every few seconds. I will try to pick one up later this evening with some new hoses.
GolfVenture Posted October 4, 2014 Author #14 Posted October 4, 2014 I use my Stihl every couple of years,,, so I offered it to a friend if he would buy me a good quality electric. He likes it. My new WORX is still in the box, 2 months later. But my yard is only 3/4 acre,,, so a 100' cord can cut anything I need. He's got 7 acres, so he's "happy as a camel on Wednesday". Not worried about bad gas no more. If I decide to be a lumberjack when I retire next May,,,, "I may have to re-think this thing". Mike Mike Mike Mike: Could you tell me more about your electric chain saw. I read about them but did not know how well they cut. I will be taking down some trees to build a new garage. 100ft extenson cord would work good for me also.
djh3 Posted October 4, 2014 #15 Posted October 4, 2014 I had all kinds of troubles with my 2 stroke trimmer. Not the least of harder fuel lines than a guy that eats a pound of bacon and 6 eggs for breakfast for 30yr. I kind of chased all kinds of scenarios. first the primer went. Well changing that a fuel line snapped off. So new fuel lines. then the one in the tank broke off. Now that there one is a PIA to fix. Still I had to run with choke 3/4 on to make any steam. New plug and "good" 2 stroke oil and hi test fuel. So now will only use like homelite or evinrude or something name brand oil mix, no more wally world stuff.
Mike G in SC Posted October 4, 2014 #16 Posted October 4, 2014 (edited) Mike: Could you tell me more about your electric chain saw. I read about them but did not know how well they cut. I will be taking down some trees to build a new garage. 100ft extenson cord would work good for me also. Brian, as noted,,,, it's still in the box. Have not had the need to use it or the "round-toit" to play with it, yet. I could only go by ratings (electric best rated was WORX or Remington) and word of mouth that they can do great yard work. Got it a Lowes. I did get and use the WORX jaw saw last year and it will cut a 4" limb like mad. I got the long extension and found you need pretty good arms to hold it in the air on a ladder. (thus got the chainsaw). Else, it is easy and fast. I just know that my need every year or so does not warrant keeping up with a two stroke. Oh, but one thought. If you lost power due to a storm,,, it will be hard to use the electric! Mike G. Edited October 4, 2014 by Mike G in SC
Cougar Posted October 4, 2014 #17 Posted October 4, 2014 Got rid of all my gas saws, this is the BEST saw I have ever owned! Mo more mess, cuts just like the big boys / read the reviews. never going back to a gas saw. [ame=http://www.amazon.com/gp/product/B000LFL152/ref=oh_aui_detailpage_o06_s00?ie=UTF8&psc=1]Amazon.com : Makita UC3530A Commercial Grade 14-Inch 15 amp Electric Chain Saw with Tool-Less Blade And Chain Adjustments : Power Chain Saws : Patio, Lawn & Garden@@AMEPARAM@@http://ecx.images-amazon.com/images/I/41fOFwolH0L.@@AMEPARAM@@41fOFwolH0L[/ame] Make sure you get the correct 100 foot cord for it. [ame=http://www.amazon.com/gp/product/B000BQM06U/ref=oh_aui_detailpage_o07_s01?ie=UTF8&psc=1]Yellow Jacket 2885 12/3 Heavy-Duty 15-Amp SJTW Contractor Extension Cord with Lighted Ends, 100-Feet - - Amazon.com@@AMEPARAM@@http://ecx.images-amazon.com/images/I/513xH8iVPQL.@@AMEPARAM@@513xH8iVPQL[/ame] Power Outage? no problem, I just plug it into my generator ! :-) Good luck ! Jeff
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now