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Author Topic: improving Grubb screw type vents  (Read 2635 times)

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improving Grubb screw type vents
« on: October 26, 2015, 11:07:22 pm »
[img http:///img]

Trying to figure out a no leak tank vent to retrofit the older grub screw type on older saws. Found a R/C valve that works for a while then the gas eats the flapper material.  Anyone know of a similar sized check valve that's gas proof??


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Re: improving Grubb screw type vents
« Reply #1 on: October 26, 2015, 11:54:56 pm »
The only other ones I know of are the ones I see on the Echo and Shindiawa weed trimmers.
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Re: improving Grubb screw type vents
« Reply #2 on: October 27, 2015, 09:47:19 am »
Thanks, I'll take a look at them
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Re: improving Grubb screw type vents
« Reply #3 on: October 27, 2015, 10:12:55 am »
Shouldn't there be a flapper check valve pulled into the tank? All you need on the line is something to keep debris out.
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Re: improving Grubb screw type vents
« Reply #4 on: October 27, 2015, 12:04:01 pm »
Shawn, I'll check. This one had two grub screws in it
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Re: improving Grubb screw type vents
« Reply #5 on: October 27, 2015, 02:05:42 pm »
Some stihl models should be a rubber umbrella flapper inside the tank with the tit pulled into the breather boss area. They are the exact same umbrella flapper used in accelerator pumps in holley and edelbrock carbs. This keeps anything from leaving the tank, then the line has grub screws to keep the debris out.

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Re: improving Grubb screw type vents
« Reply #6 on: October 27, 2015, 02:28:57 pm »
Yep, bought a couple dozen of those last month for about 50 cents each!!   Stihl was about $8.

 Not sure if this early 044 tank has one of the umbrella check valves like the later tanks.  I'll check tonight
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Re: improving Grubb screw type vents
« Reply #7 on: October 27, 2015, 04:11:12 pm »
echo type vents $1.89 at carbtech21
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Re: improving Grubb screw type vents
« Reply #8 on: October 29, 2015, 12:15:51 pm »
Shawn, saw IS set up for an umbrella vent but missing. Put a new one in!!  Nightmare to pull through as the tube is Sooooo small. Used small hemostats.

Carburetor umbrella and Stihl appear identical less the mfg markings
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Re: improving Grubb screw type vents
« Reply #9 on: October 29, 2015, 12:17:01 pm »
Stihl on right



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