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jeffo's avatar
jeffo
Explorer
Jan 17, 2015

Onan Generator wil not Prime

I have a 2013 Onan 5500 gas generator. I was going to exercise it today and when I hit the prime I cannot hear the pump running. It turns over fine but will not start. I assume it not getting any gas. Not sure if the pump you hear when you prime is the fuel pump that also feeds the carb after it is started. I checked all the wires that I can see, all look fine. Not sure where the primer pump is? It ran fine last month and the gas tank is full.
  • jeffo's avatar
    jeffo
    Explorer
    Jan 19, 2015
    I checked the voltage to the pump and I am getting 14.5 when the rocker switch is in the prime position. I read somewhere to tap the pump with a screw driver handle but it did not work. I guess I will replace the pump.
  • azrving's avatar
    azrving
    Explorer
    Jan 19, 2015
    Is a Bendix type pump that sort of chatters until it builds pressure? Crack a line and check for pressure.
  • jeffo's avatar
    jeffo
    Explorer
    Jan 19, 2015
    Its a small diaphragm type pump. It is not making any sound at all now, You can normally near it from inside the RV. An Onan pump is 94.00 and a Airtex pump is 38.00. I think I will try the Airtex It is very easy to change if it does not last. However they get good reviews.

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