Craftman Power Washer


Old 06-16-12, 09:43 AM
mr_sma_jr's Avatar
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Join Date: Jan 2007
Location: USA
Posts: 56
Craftman Power Washer

I have a Craftman Power Washer, 1500PSI, 3.75HP that won't stay running... I prime it nad she start but only burns the prime gas, then dies... I swapped off the carb and gas tank from another engine - same results... Am I missing something ??? Does the water flow (water is on and hooked up) pump/valve have anything to do with starting & running a pressure washer ??? Any ideas ???
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Old 06-16-12, 01:02 PM
Join Date: Jun 2006
Location: St. Louis
Posts: 2,365
It sounds like a bad diaphram however since you have used two different carbs that would seem strange unless the diaphram is bad in both. The intake pipe or the "O" ring seal on the intake may have failed. While it is running, short time I know, spray some carb/brake parts cleaner behind the carb where the carb meets the block if the engine tempo changes you have an air leak. In case both diaphrams were bad, below is my normal post to replace them. Have a good one. Geo

You need to install a new diaphram kit, it is Briggs part # 795083 or old # 495770 also Lowe's has a kit #5083 which has the same parts.
Here we go:

Remove air cleaner, there are 2 bolts that hold things together, one on the front of the tank 3/8" and one into the block 1/2", remove these bolts, now "slowly" slide the carb/tank off the intake tube and breather tube, now tilt the tank in to release the throttle linkage and waalaa the carb/tank is removed. Check the intake tube to see if the O ring seal and plastic retainer are still on the intake tube, if so remove them and re-install them into the carb. Remove the 5 screws from the carb/tank remove carb(don't loose the spring) now spray all holes, cracks and crevases in both the carb and tank surface with brake parts cleaner, remove the main screen(looks like a thimble), now with a small screwdriver pry out the main jet(carefully) and clean it, check the O ring on the main jet for damage, if it is damaged it must be replaced, reinstall the jet, it can be difficult some times to get it to snap back in place(I use the rounded end of a screwdriver handle). Remove and clean the fuel pickup stem(not necessary if the fuel tank was clean). Clean any junk/rust from the tank. Install the diaphram on the tank then the gasket(no goo or sealer) now carefully replace the carb(the spring will try to misalign the diaphram), tighten all screws a little at a time so as not to crimp the diaphram until they are all tight. Install the carb/tank in reverse order and you are done. If I missed something one of the real mechanics will correct me. Have a good one. Geo

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