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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.


 


More Videos...


Walbro Carburator How does the Fuel-Pump work
The Walbro Carburator has a fuel pump that work nomatter what direction you keep it in. It will work upside-down too. The ordinary float-chamber carburator will not. How the Walbro Throttle and valve work; http://www.youtube.com/watch?v=9-xgVEvUxuM





HOW TO - Two Cycle Carburetor Cleaning / Rebuild (Part 1 of 2)
Since this is only an instructional video series I was not going to use any carburetor cleaner. Basically i'm explaining how to check the pump diaphragm, & metering diaphragm as well as how to clean a two cycle carburetor. K10-WAT & K20-WAT rebuild kits are for all WA & WT series Walbro carburetors. Most of the time you can get away with ordering a K10-WAT if you only need to replace the diaphragms. If you need to do a complete rebuild order K20-WAT. There are special tools for checking both Zama, and Walbro carburetor metering levers but I have found that a metal straight edge ruler is just as accurate. WALBRO METERING LEVER TOOL : http://compare.ebay.com/like/110600202910?var=lv<yp=AllFixedPriceItemType s&var=sbar&rvr_id=216029650572&crlp=1_263602_309572&UA=WVF%3F&GUID=9170fef0 12e0a0645631a321ffbb97bc&itemid=110600202910&ff4=263602_309572 ZAMA METERING LEVER TOOL : http://cgi.ebay.com/NEW-ZT-1-Zama-Z-Carburetor-Metering-Lever-Tool-/1106001 90012 This rebuild / cleaning procedure will also apply to carburetors without a purge bulb. I will do a proper video when I have an actual rebuild or cleaning.





How To Fix Any Small Engine Tips
in this video i will be showing you guys some tips for fixing any small engine





try to crank a rusty engine.
NFG wdb108 280se merc. one last time for fun.





husqvarna 357XP
husqvarna 357XP bei einer buche mit 7 fm!!





HOW TO ADJUST A Homelite Carburetor
this will work for chainsaws,trimmers,leaf blowers,hedgers





How a carburetor works, schemes and explanations
This video explains, not in too much detail, how a 28mm Walbro diaphragm carburetor works (using mainly schemes to point out what happens inside). It explains what occurs at the venturi, what the butterfly valve is for, how the needle doses the amount of fuel, and how does the diaphragm slide adjust itself.





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.





Small Engine Repair: Cleaning Carbon Buildup on the Exhaust Port & Muffler on a 2 Stroke 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.** Small engines used in outdoor power equipment often suffer from carbon build up in the cylinder head, Exhaust port and muffler. The is more common in 2 stroke engines than 4, but it does occur in both. In this video I inspect the Exhaust port and muffler on a Echo SRM-230 trimmer. The muffler was very clean, but the Exhaust port had carbon build up that blocked half the port. To clean the port, rotate the engine until the piston skirt is covering the Exhaust port, and take a screw driver and lightly scrape the port to remove the carbon. Than take compressed air and blow out the port to remove the carbon pieces. Mufflers on small engines are usually sealed units, so cleaning them is very difficult if not impossible. Its easy and less expensive to replace a sealed muffler with a new one. Some mufflers have screens, which can be cleaned with a wire brush and compressed air. This trimmer was run by the previous owner without a trimmer line knife attached to the deflector. This allows the trimmer line to extend beyond the manufacturers recommended length, and this causes a excessive load on the engine. I believe this is primary responsible for the carbon build up on the port.





Tecumseh carburetor rebuild
I just wanted to get the most important information out there. This thing will run fine, as soon as everything is done soaking!! Enjoy!





Small Engine Repair: Inspecting the Drive System on a Scotts Self Propelled Walk Behind Lawn Mower
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 inspect the drive system on a Scotts self propelled walk behind lawn mower. Scotts does not manufacture their mowers, and the mower shown in the video is actually manufactured by Murray. Scotts also has John Deere manufacture mowers under the Scotts label. The self propelled wheels on this mower are actually plastic ring gears with tire tread, and the most common problem you will find with this type of system is the metal axle gear has a tendency to wear down the plastic ring gear, and cause the two gears to slip. It is an easy fix, and each wheel only requires removal of one nut and washer to remove the worn wheel and replace it with a new ones.





Small Engine Repair: Rebuilding a Diaphragm Carburetor on a Echo SRM-230 Trimmer Part 1 of 3
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.**





Small Engine Repair: Rebuilding a Diaphragm Carburetor on a Echo SRM-230 Trimmer Part 2 of 3
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.**





Carburador SU, de diafragma
Carburador de diafragma Funciona operando el acelerador que abre y cierra una mariposa, a medida que se abre la mariposa el aire que entra genera un vacío que sube y baja un diafragma que mueve la cortina, haciendo que pase aire - gasolina al motor revolucionando a medida que sube y baja el diafragma y la cortina. Este carburador es más eficiente en motores de 4T de mediana cilindrada y es eficiente en bajas, pero sobretodo en altas rpm.





How to Rebuild a Zama Carburetor- Echo Backpack blower carb
Time to rebuild the carburetor on this blower, so i made a video of how to do it





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