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Hello! How long have you owned it? Question is directed at the carb and fuel pump...I would suggest rebuilding the carb with kit and replacing the fuel pump at the same time...see photos below...There are a couple of different fuel filters; one for a non- fuel pump (gravity feed) and one with a fuel pump...Your engine requires the fuel pump filter...dirt and varnish build up in the carb and pump especially if the wrong filter is installed...Buy a gallon of carb cleaner with the tray inside... Guru...saailer
Genuine OEM Part - Manufacturer #808656...$18 Fuel Pump
Genuine OEM Part - Manufacturer #691035...$6 Filter
Genuine OEM Part - Manufacturer #797890...$45 Rebuild Kit
if the diaphragm in the fuel pump gets a small hole in it , it will still run, but **** fuel into the crankcase, the fuel pump is serviceable, and easy to rebuild, a new diaphragm kit is fairly cheap at any local saw shop, just remember to take the model number off of the engine so they can look it up, and sometimes its a good idea to take the pump in with you to match it..
If gravity feed works to the fuel line on the carburetor, then the fuel pump is bad. Repair or replace fuel pump. I am looking for fuel resistant sealant to repair fuel pump diaphragms. Has anyone tried Permatex 85420 or something else to achieve this? My application is antique and the part is no longer available at a reasonable cost.
Ok I haven't worked on this exact model before but Im curious if the engine runs? It sounds to me like a fuel pump that uses crankcase pulses to pump the fuel. It is very common way to pump fuel but usually the pump portion is in the carb and not the fuel line. If it were attached to the intake Id say it was a crankcase breather.
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