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WidowMaker

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Bin Lurkin here for sometime now. GREAT site. Love the Art Martin thread and the 056 rebuild thread by Lakeside. The knowledge available and willingness to share is super. I'm fairly new to saw work, been a mechanic for several years, all 4 cycle stuff.

Along with my two son in laws and #1 son in laws father we cut 40 to 50 cord of firewood a year, mostly red fir and tamarack. Now to my problem.

Son in law came by an 064 recently that needed work, would fire and try to run, spit gas all over the place. Bad fuel line. Replace fuel line, put in about a 1/4 tank of gas, started up and ran fine after about a 1/2 dozen pulls, idles good, accepts accelerater good. Life is good....shut it off pat my self on the back and think son in law will be proud of me.

Fast forwar to next day, son in law comes over, I proudly take him out to the shop to demonstrate my acompishment in repair of his saw. Grab the starter rope give in a pull, saw jumps all over the place...what the h..l, couple more pulls, same thing. Notice raw gas running out of muffler..:( , :confused: .Grab tools and start pullin things apart. Pull the fuel line off of carb nipple and fuel bubbles out ??? how can this be, shouldn't be any pressure in the fuel tank.

Dumd founded we talk about the problem for a bit and come up with no answeres. Leave the saw over night, go out this a.m pull the saw over a few times and gas is squirts ever where, out the intake port, out the spark plug hole, out the rubber nipple below the carb.

Need some HELP, what gives???How does the fuel tank get pressurized? Why does the crankcase fill with gas while the saw just sits there overnight...
I know you guys know, and it probably a simple fits, but I at a loss...

Sorry for such a long post, I'm normally not this wordy...


Thanks for any and all assistance


WidowMaker.

I'll be away from the puter for a while so I won't be able to respond to any question til later this afternoon... :help:
 
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Welcome!

Welcome! Warning: This site may cause severe urge to get on the computer, and work on and run chainsaws! All rights reserved,LOLOLOL.:laugh: :rockn: :D :rock:
 
Welcome to the site!

Now fix the carb inlet needle,,,, it is not sealing,,,there may also be a tank vent problim,,,just clean that.

====

Took the carb apart and blew out all passages, all appeared good.

Tank vent appears to be simply a 2in long hose with a screw in it, is this proper???

Went to put carb back on, pulled the saw over a couple of time to see if excwss fuel had evaporated..still got fuel out of nipple below carb,
thought that might be correct. Went to pull plug out of carb fuel line, gas sprayed everywhere...is this tank somehow supposed to be pressurized??????


WidowMaker... still :confused: :newbie:


edit

More searchin found this thread http://www.arboristsite.com/showthread.php?t=45911&highlight=tank+vent which seems to answere all my question about the vents and the positive pressure on the fuel tank.

I did manage to break the little flaper valve in the tank vent, have to pick up another one tomorrow... I'm off to reinstall the carb and try to fire this thing up again....
 
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when you said you blew it out, did you use compressed air? You need to be careful when you put compressed air through chainsaw carbs. You can blow a gasket but you probably already knew that right?
 
The tank pressurizes due to the vapor pressure from the gas. Shake up your gas can and see what I mean...take the cap off carefully..


The tank vent in your case will allow air in and out, but slowly. Later versions only allow air in and you can get a pretty good tank pressure if you agitate the gas or leave it in sun...

Check the tank vent (easiest way is a vacuum tester on the fuel line - no gas in tank). To check the carb inlet valve, pressurize the carb fuel inlet to about 8psi - it should not leak. If it does, rebuild the carb (less than $10).
 
when you said you blew it out, did you use compressed air? You need to be careful when you put compressed air through chainsaw carbs. You can blow a gasket but you probably already knew that right?

worse than that - you can destroy the outlet valve under the the main jet
 
when you said you blew it out, did you use compressed air? You need to be careful when you put compressed air through chainsaw carbs. You can blow a gasket but you probably already knew that right?



No I didn't know that and yes I did use comressed air...

====
worse than that - you can destroy the outlet valve under the the main jet.


I hope not.

Saw started and ran okay, so my haps I got lucky...


Thanks for the help guys...I sure I'll be back for more.

Oh, already did a muffler mod on my 029 Super because of this site....so I been infected....:laugh:
 

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