How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask JohnF2015 Your Own Question
JohnF2015, Small Engine Technician
Category: Small Engine
Satisfied Customers: 1102
Experience:  Owner/Service Technician at S & J Small Engines
Type Your Small Engine Question Here...
JohnF2015 is online now
A new question is answered every 9 seconds

Was reading your previous answer to a question regarding a

Customer Question

Was reading your previous answer to a question regarding a Mantis 2 stroke tiller engine issue. From what I gather it appears a carburetor rebuild is in my future. Engine starts briefly but only runs for a second or two. What does the check valve do and is there a specific position it should be in outside the fuel tank?
Submitted: 1 year ago.
Category: Small Engine
Expert:  JohnF2015 replied 1 year ago.

Hi, my name is***** will be assisting you.

The check valve allows air to be pulled into the fuel tank but will not allow fuel to come out of the tank. It is in place in order to keep from developing a vacuum inside the fuel tank which would cause you to no longer be able to pull fuel from the tank to the carburetor. There is no specific position for the check valve other than it needs to be outside of the tank and in a position that it does not get hit or knock off easily.