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mantis fuel problem solution


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#1 ol' stonebreaker ONLINE  

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Posted April 30, 2016 - 08:40 PM

Every since I've had this it would force gas thru the carb and get the little air filter soaked w/ the oil gas mixture making it hard to start and running rich. I  finally decided to find the cause and found the problem was in the tank vent tucked under the fan housing. On taking it apart I found it had a little felt filter and a check valve designed to let air in the tank but none out. I removed the check valve and so far no more fuel mix in the air filter.  Apparently when the tank cooled off at nite it would let air in and when it warmed up the air couldn't escape so it would push fuel thru the carb.

                                 Mike


Edited by ol' stonebreaker, April 30, 2016 - 09:02 PM.

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#2 Cvans ONLINE  

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Posted April 30, 2016 - 10:27 PM

 On taking it apart I found it had a little felt filter and a check valve designed to let air in the tank but none out.

 

Congratulations on tracking down the problem. 

I think you can thank California for getting stuff like that installed. 


Edited by Cvans, April 30, 2016 - 10:27 PM.

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#3 Alc ONLINE  

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Posted May 01, 2016 - 05:35 AM

Mike does this have just one line going to the tank or two ? I just changed a line on my little 4 stroke Troy Built mini and didn't see a vent , but the line I replaced seem to be a return from the primer bulb

#4 Bmerf ONLINE  

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Posted May 01, 2016 - 06:29 AM

Wonder if this is what is wrong with mine. Starts perfect when cold; then after ~15-20 minutes, no go. It will not start. Let it cool off and away we'll go.



#5 ol' stonebreaker ONLINE  

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Posted May 01, 2016 - 06:55 AM

  Alc, mine has 3 lines, suction, return and vent. Bmerf, try running it w/ the cap loosened to see if the vent isn't letting air in.

                                          Mike


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#6 ol' stonebreaker ONLINE  

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Posted May 01, 2016 - 04:44 PM

   After 3 days I started it, started 1st pull, hasn't done that since new.

                                        Mike


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