Honda Gx390 Shutting down!

Discussion in 'Mechanic and Repair' started by Petr51488, Nov 24, 2011.

  1. Big C

    Big C LawnSite Bronze Member
    Messages: 1,642

    I have that same engine on my Mi-T-M pressure washer and had the same problems you mentioned, I spoke to the mechanic at the dealer in which I bought it and he told me that it is a "known issue" that the OEM(emission control) gas caps cause the engine to vapor lock while running. I changed my gas cap to an aftermarket vented cap and my pressure washer ran flawlessly
  2. jetta

    jetta LawnSite Member
    Messages: 223

    we had the same problem w/ our aerators new , the shop just raised the oil level , took care of it
  3. jbturf

    jbturf LawnSite Bronze Member
    Messages: 1,503

    what gas cap are you guys using to replace the tall chrome cap?

    ive had the same gas cap trouble on a couple of hondas now, after recieving replacement caps that were identical and same trouble, machine manufacturer told me to just drill a small hole thru it,

    i havent had much luck with that and want to just replace with with the normal cap

  4. Petr51488

    Petr51488 LawnSite Silver Member
    from NJ
    Messages: 2,377

    I just used their standard lower flat gas caps that are used on all the commercial engines. Their just a little harder to take off than the taller ones.

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