Small Engine Repair: Checking Fuel Pump Diaphragm & Inlet Needle on a Diaphragm Carburetor

Visit http://www.thesmallengineshop.net **Always follow the instructions in your repair manual when doing repair or maintenance work on Outdoor Power Equipment. Manuals can be found at the manufacturers website.** In this video I show how to check the fuel pump diaphragm and inlet needle for leaks on a diaphragm carburetor. A diaphragm carburetor is used on hand held power equipment, and are popular because they will work in any position. All chainsaws, trimmers and blowers that I have seen use a diaphragm carburetor. To check the fuel pump and inlet needle, pressurize the carburetor to 10 psi through the fuel inlet. The carburetor should hold the pressure fairly steady, and if it doesn't than there is a leak around the fuel pump diaphragm or inlet needle. You can pin point the leak by dunking the carburetor in water while it is pressurized. If the leak is around the fuel pump diaphragm, than either the fuel pump diaphragm, fuel pump diaphragm cover or the body of the carburetor is at fault. If the leak is coming out of the venturi, than the inlet needle or seat is faulty. Tools used: - 3/8" wrench to remove carburetor - Mityvac to pressurize the carburetor - Needle Nose plyers Specifications: - Carburetor should be pressurized to 10psi through the fuel inlet. Never exceed 10psi. Its important to run fuel through the carburetor before testing. A wet carburetor will hold the pressure better than a dry one.

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Small Engine Repair: Using a Harbor Freight Leak-Down Tester on a Briggs & Stratton Engine
Visit http://www.thesmallengineshop.net **Always follow the instructions in your repair manual when doing repair or maintenance work on Outdoor Power Equipment. Manuals can be found at the manufacturers website.** This video is about how to use a Harbor Freight Leak-Down Tester on a small engine. I wasn't able to get the tester to work correctly using the instructions provided with the tester, so I made one change, and the tester seems to work correctly. The instructions say to connect the tester to the engine before you apply compressed air and adjust the regulator, but it didn't seem to work correctly, so I applied the compressed and adjusted the regulator before connecting the tester to the engine. This correction made the difference, and I was able to use the tester to determine the condition of the engine. It would be interesting to hear about other experiences with this tester, so please leave a comment, and thanks for watching.




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