Tip & How-To about Garden
It is quite obvious, by the amount of reqests we see that there is confusion regarding the correct orientation of fuel hoses on externall primers.
Lets start by saying this component is not a primer, if you were to push fuel into the carb, you would just flood it, and make starting near impossible, they are purges, they actually pull fuel from the carb, and dump it back into the tank, this way you cannot over purge the machine, and when the saw runs out of fuel, it very quickly re fills the carb ready for easy re starting.
So the fuel hose from the fuel tank,the one with the fuel filter on the end, goes to the fuel inlet elbow on the carb, this is the elbow closest to the pump cover on the carb, normally held with one philips head screw and made of alluminium. The other hose from the carb, closest to the metering side of the carb, normally held with four screws and made of chrome plated steele, goes to the shorter of the two connections on the back of the purge, this is the suction side,by pulling fuel from the carb emptys the fuel chamber, atmospheric pressure from the vent hole in the metering cover pushes the metering diaphram down opening the fuel inlet needle, allowing fuel from the tank to enter, and re fill the chamber, you can test this by putting a finger over the connection, depress the purge bulb and let go, you should feel your finger sucked down, the longer of the two connections on the back of the purge is the pressure side, this hose will go back to the tank, it will just push into the tank with nothing on the end, you can test this side by putting a finger over the connection, depress the purge bulb, you will feel a pressure on your finger, if you have clear fuel hoses, you will be able to see the fuel movement. Any signs of cracks, splits, or fuel loss from any of the hoses will greatly effect the running and well being of the machine.
I hope this has been helpfull and informative.
Posted by Andrew... on
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