Some times there is a check valve, other than the pump diaphragm which has to be working.īetween the pump and the metering valve is generally a screen which also has to be clean. That is not much in the way of pumping pressure.Īs the metering chamber pressure falls it will draw whatever is in the pumping chamber into it. When you take your finger off, the springyness of the plastic causes the bulb to return to its original size.īecause of the one way valve, this creates a low pressure zone inside the bulb so it draws whatever is in the carb metering chamber, be it air or fuel, into the primer bulb.
When you press the bulb you expel what is inside the bulb.
The primer, which is not a primer by the way, has a one way valve on it. You really need to go to the Walbro web site download the carb manuals then READ them.įor those with limited reading skill or language problems there are also some videos.
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