Question about Garden
Hi there, The manual primer is a pump and relies on its ability to deform and revert back to it's original shape in order to pull fuel from the tank, through the carb and into the primer bowl when released and pump what's in the bowl back to tank when pressed. The system uses one or lately two valves in the primer body to achieve this pumping action. It looks like your looking in the right area (running only on choke is a clue too) as I suspect that you have a blockage on the suction side ie anywhere between the fuel filter and the primer bowl. It is possible that the fuel lines are collapsing internally under vacuum closing off the fuel supply. Another area to look is the carb itself. You've probably discovered that there is a filter in the carb body on the fuel pump side under the diaphragm - this an extremely fine mesh and can give the appearance of being clean when in fact gummed up. This filter feeds the needle valve which in turn allows fuel into the metering section and then into the air stream via the mixture control screws for high and low speed (H & L) It is possible that the needle valve is sticking and thus also restricting fuel supply. When cleaning carbs out don't use carb cleaner - sounds odd, I know, but most carb cleaners are unsuitable for diaphragm carbs, OK sparingly for the outside but not the inside unless it says on the tin that is safe for diaphragm carbs. Use Brake and Clutch cleaner. Happy hunting !
Posted on Nov 06, 2010
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Posted on Jan 02, 2017
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