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Old 11-17-2015, 04:04 PM   #1
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Onan

Hi , My wife and I are brand new members so I hope I am doing this correct . I am changing the fuel pump on our 3.0 AJ-1R onan genset to an electric one. Where is the best place to get 12 volts from ?
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Old 11-17-2015, 07:05 PM   #2
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Modern generators have electric fuel pumps, although they are special low pressure pumps so not to flood the engine. In addition, they have electronic circuits that monitor oil level and pressure, temperature, etc. One of the functions of that board is to turn the fuel pump power on while cranking, but it shuts the power off if no ignition is detected.

The problem with your generator is that it has no easy way to safely turn on and off the electric pump. In this linked manual,

http://www.manualslib.com/manual/898...et.html#manual

there is mention of a gas shut off solenoid, that might provide power when appropriate, but I'd check very carefully that it will shut off the pump if the engine stops.

I think if you can find a mechanical fuel pump, you might just replace the old with a new one.
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