MS290 STIHL Farmboss - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 8 (permalink) Old 11-04-2013, 11:00 AM Thread Starter
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MS290 STIHL Farmboss

Ok, not having taken my saw apart yet, not enough experience with small engines, this weekend before I started cutting; did the usual clean up oil, fuel chain tension. I fire the saw up and there is pressure building up in the fuel tank and fuel spraying out from above the tank and out of the fuel cap.

I don't think I will be able to get to this soon, but it will be one of my winter projects.

Any ideas?

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post #2 of 8 (permalink) Old 11-04-2013, 09:21 PM
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Originally Posted by Fahlin Racing View Post
Ok, not having taken my saw apart yet, not enough experience with small engines, this weekend before I started cutting; did the usual clean up oil, fuel chain tension. I fire the saw up and there is pressure building up in the fuel tank and fuel spraying out from above the tank and out of the fuel cap.

I don't think I will be able to get to this soon, but it will be one of my winter projects.

Any ideas?
I have the same saw and it has a vented fuel cap with a check type valve in it to prevent spillage. Ensure it is not plugged by removing it and submerging in gas and sloshing around. Chainsaws live in a harsh environment when in use even before the ride in the back of a pickup exposed. Seldom do they get the attention they deserve and are cussed routinely when they don't start from lack of maintenance.

The question I seek an answer for is simply; why, or why not?
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post #3 of 8 (permalink) Old 11-05-2013, 01:01 AM Thread Starter
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Seems like it could be something simple. My saw runs fine, idles perfect almost, just when I have it at full-rev is when it builds pressure and blows from above and out the cap. Interesting stuff. I run the saw until all the fuel is gone, nothing gets to sit in it for long periods of time, clean it before each cutting.

Jim "Iron Giant" Fahlin ~ A high performance car is like a guitar, you have to tune it to achieve your best operation and pull ahead of the competition.

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post #4 of 8 (permalink) Old 11-05-2013, 01:11 AM Thread Starter
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I am not sure if carburetor cleaner would be too harsh for that cap, what do you think backslap?

Jim "Iron Giant" Fahlin ~ A high performance car is like a guitar, you have to tune it to achieve your best operation and pull ahead of the competition.

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post #5 of 8 (permalink) Old 11-05-2013, 01:46 AM
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I am not sure if carburetor cleaner would be too harsh for that cap, what do you think backslap?
I've never used anything but gasoline. It's sawdust and oil residue from the bar slingoff that usually fouls the vents.

The question I seek an answer for is simply; why, or why not?
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post #6 of 8 (permalink) Old 11-05-2013, 01:51 AM Thread Starter
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Yeah, 2-cycle does get a bit gummy too besides bar oil. I think I should just tear it down in the winter for a good cleaning.

Thanks!

Jim "Iron Giant" Fahlin ~ A high performance car is like a guitar, you have to tune it to achieve your best operation and pull ahead of the competition.

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Last edited by Fahlin Racing; 11-05-2013 at 01:52 AM. Reason: added
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post #7 of 8 (permalink) Old 02-21-2016, 02:06 PM Thread Starter
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Well, Backslap after I picked up all of the parts I finally had time to service it each weekend I could (its at the inlaws).

The vent I have (Stihl actually showed 2 different styles) comes up from the tank port on the left side of the handle and goes over above the carburetor and comes down slightly into a rubber holder. Other saws seem to show just a short hose with a bleeder in the end. I thought I would state that so people know the possibilities of this saw. I ran a pipe-cleaner through the tube also to be sure of no obstructions.

I spoke to a tech at the local hardware and when he gave an answer, 'if your hand is getting wet from fuel there is a good chance your fuel line going to the carb is leaking'. I tore the saw down to r&r that and I replaced the impulse-hose off the crankcase also since I was in there. Cleaned up some stuff and now I am about to hook the linkage for the chain-lock back up and fire it up again for this year and the father in-law needs some tree trimming. Wiring looks good still, I would say the one thing that would need to be replaced is going to be the bar when I can.

Jim "Iron Giant" Fahlin ~ A high performance car is like a guitar, you have to tune it to achieve your best operation and pull ahead of the competition.

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post #8 of 8 (permalink) Old 03-27-2016, 04:11 AM Thread Starter
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Service kit MS290, 310, 390

Service kit number 11270071800
and
Impulse hose 11271418600

Jim "Iron Giant" Fahlin ~ A high performance car is like a guitar, you have to tune it to achieve your best operation and pull ahead of the competition.

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