| Onan generator questions. [message #337507] |
Mon, 01 October 2018 16:54  |
Scott Nutter
Messages: 782
Registered: January 2015
Location: Houston/San Diego
Karma: 4
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Senior Member |
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Thanks, a few questions.
#1.. how long should the fuel pump prime-button be depressed while priming before starting?
#2.. Is it advised to also depress the primer button while starting the APU?
#3..Once the generator is started and up to speed, does the generator suction feed fuel or does the electric fuel pump run while the generator is running?
Thanks, Scott.
Scott Nutter
1978 Royale Center Kitchen, Patterson 455, switch pitch tranny, 3.21 final drive, Quad bags, Dave Lenzi super duty mid axle disc brakes, tankless water heater, everything Lenzi. Alex Ferrera installed MSD Atomic EFI
Houston, Texas
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| Re: Onan generator questions. [message #337509 is a reply to message #337507] |
Mon, 01 October 2018 17:09  |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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Senior Member |
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Scott Nutter wrote on Mon, 01 October 2018 14:54Thanks, a few questions.
#1.. how long should the fuel pump prime-button be depressed while priming before starting?
5 - 10 seconds should be enough
#2.. Is it advised to also depress the primer button while starting the APU?
According to Jim Bounds, yes. It sends a full 12 volts to the coil and provides a hotter spark for starting
#3..Once the generator is started and up to speed, does the generator suction feed fuel or does the electric fuel pump run while the generator is running?
The electric fuel pump continues to provide fuel to the carburetor once the generator is running. The gas tank is well below the carburetor, so fuel needs to be pumped up to it.
Thanks, Scott.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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| Re: Onan generator questions. [message #337511 is a reply to message #337507] |
Mon, 01 October 2018 17:11 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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1. You can hear the sound change when the pump starts to deadhead. That's how long it needs to be primed, once the floart chamber is full and the valve closed running the pump longer doesn't change things.
2, Shouldn't be needed, if the ignition is on the pump is powered. (If it runs only with the prime button pressed, look at the wiring and the control card)
3. The fuel pump is powered any time the genset is running.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: Onan generator questions. [message #337512 is a reply to message #337507] |
Mon, 01 October 2018 17:12 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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1. You can hear the sound change when the pump starts to deadhead. That's how long it needs to be primed, once the floart chamber is full and the valve closed running the pump longer doesn't change things.
2, Shouldn't be needed, if the ignition is on the pump is powered. (If it runs only with the prime button pressed, look at the wiring and the control card)
3. The fuel pump is powered any time the genset is running.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: Onan generator questions. [message #337517 is a reply to message #337507] |
Mon, 01 October 2018 18:30 |
Scott Nutter
Messages: 782
Registered: January 2015
Location: Houston/San Diego
Karma: 4
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Senior Member |
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Thanks Carl and Johnny.
That answers all questions.
Scott.
Scott Nutter
1978 Royale Center Kitchen, Patterson 455, switch pitch tranny, 3.21 final drive, Quad bags, Dave Lenzi super duty mid axle disc brakes, tankless water heater, everything Lenzi. Alex Ferrera installed MSD Atomic EFI
Houston, Texas
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| Re: Onan generator questions. [message #337530 is a reply to message #337507] |
Tue, 02 October 2018 07:42 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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Somehow, my reply was like 'New York, New York' in case you missed it the first time. Sorry 'bout that.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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