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DeVilbiss Pressure WAsher EXH2425 Honda engine GC160qha pump DAPC axcial cam. When using washer sprayer both the engine and pump seem to operate normally. As soon as I let off the trigger of sprayer the engine dies. Help?

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Hi and welcome to FixYa. I am Kelly
Take a look at your engine parts manual here:

http://shoppingcart.msservicecompany.com/msservice_net/product_files/GC160AQHA/gc160%20qha_1.pdf

Watch item 22 and 4 (pdf file page 5) as the engine unloads to see if it is rocking. If it is stuck in one position it will do exactly what you describe.

Also check the 2 springs items 4 and 5 (pdf file page 7.) If one of them is broken it can cause the problem.

What I really think is happening is that the throttle linkage is moving too far and striking the kill switch on the control lever (pdf file page 7) item 14. Watch to see if the linkage is moving and striking the engine stop switch.

Your engine also has an engine fuel pump. Item 1 of pdf file page 19. This pump is operated by the difference in crankcase and carb throat pressure. If any of the hoses are leaking it can cause the fuel pump not to work at low engine speeds and result in engine fuel starvation.

This particular engine is really fussy when the lines get old, crack, or harden. Take a long look at the condition of all of the vacuum, fuel and breather lines.

I can't say that it is the ___ line / hose is causing the problem because there are too many and any one of them can give you fits.

Download the manual... look at the linkages and hoses. I am sure your going to find the cause if you give it a good look over.

Thanks for using FixYa,

Kelly

Posted on Apr 23, 2010

  • 1 more comment 
  • BubbaDoo2 Apr 18, 2011

    It's probably the unloader valve on the pump sticking and causing the engine to stall because of too much pressure. This happened to mine - doing the same thing. Good luck finding a new one!

  • trogan77 May 17, 2011

    Yeah.. seriously.. good luck finding that unloader valve. I was actually able to rebuild mine by disassembling it, cleaning everything up and replacing the o-rings. ...I found most of the o-rings at Home Depot, surprisingly. Worked well after that.

    I actually need another identical unloader valve for an EXH2425, so if anyone has - even a crusty one - let me know.. I'll give you ten bucks for it.

  • BubbaDoo2 May 18, 2011

    I was able to rebuild mine too. Didn't even need new o-rings, just cleaned up the spring and piston and everything. It was very corroded. Works like brand new now.

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