Home » Public Forums » GMCnet » Onan Primer Fuse
| Onan Primer Fuse [message #368451] |
Fri, 14 January 2022 11:18  |
Tom Katzenberger
Messages: 399
Registered: June 2019
Location: Kingsville, MD
Karma: 4
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Guys,
Hopefully a quick easy question. I have a 4000K Onan and am installing the primer switch. What size fuse/breaker is everyone using for the primer circuit?
Thanks,
Tom K.
Tom & Oki Katzenberger,
Kingsville, Maryland,
1977 23' Birchaven, 455 C.I.D., Micro Level, Howell EBL-EFI Spark Control, Macerator, York Air Compressor, 6 Wheel Disc, Quadra Bag, Onan W/Bovee Ignition
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| Re: Onan Primer Fuse [message #368452 is a reply to message #368451] |
Fri, 14 January 2022 11:19  |
Tom Katzenberger
Messages: 399
Registered: June 2019
Location: Kingsville, MD
Karma: 4
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Senior Member |
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P.S. 23' 1977 Birchaven if it matters.
All take care,
Tom K.
Tom & Oki Katzenberger,
Kingsville, Maryland,
1977 23' Birchaven, 455 C.I.D., Micro Level, Howell EBL-EFI Spark Control, Macerator, York Air Compressor, 6 Wheel Disc, Quadra Bag, Onan W/Bovee Ignition
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| Re: Onan Primer Fuse [message #368455 is a reply to message #368451] |
Fri, 14 January 2022 12:31 |
Tom Katzenberger
Messages: 399
Registered: June 2019
Location: Kingsville, MD
Karma: 4
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Senior Member |
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Bruce,
Ten AMPs it is, thank you so much and you have a wonderful weekend.
Take care,
Tom K
Tom & Oki Katzenberger,
Kingsville, Maryland,
1977 23' Birchaven, 455 C.I.D., Micro Level, Howell EBL-EFI Spark Control, Macerator, York Air Compressor, 6 Wheel Disc, Quadra Bag, Onan W/Bovee Ignition
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| Re: Onan Primer Fuse [message #368457 is a reply to message #368451] |
Fri, 14 January 2022 17:25 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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Why don't you try 5 amp or less. 5 amp is what they used on the Onan circuit board. It runs everything that you are doing with the primer circuit.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: Onan Primer Fuse [message #368458 is a reply to message #368451] |
Fri, 14 January 2022 17:39 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Not to pee in your cornflakes, but that’s a mod I would NEVER do. Look at the size of the fuel pump compared to the carb bowl that only holds a few thimbles of fuel. If your float sticks you will be blindly pumping fuel everywhere with the primer. Without it, if float sticks it will start then flood out and die, prompting you to go inspect the situation. After 6 months non use, mine starts within 5 seconds of cranking anyway. But my choke is set correctly.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: Onan Primer Fuse [message #368459 is a reply to message #368451] |
Fri, 14 January 2022 19:24 |
Tom Katzenberger
Messages: 399
Registered: June 2019
Location: Kingsville, MD
Karma: 4
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Senior Member |
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Ken,
a five amp sounds like a good Idea. If it blows I will check the wires and then move to a 10 amp.
John,
Mine also starts in 5 seconds, it is that I have fab'ed a new control panel and moved it over the stove exhaust vent so that I can install a larger 3 way refrigerator in the Birchaven. I don't have to use it, but if needed it is there and now is the best time to create a position for it. I am also installing a switch for the refrigerator vent fan.
Take care all and have a geat evening and weekend,
Tom K.
Tom & Oki Katzenberger,
Kingsville, Maryland,
1977 23' Birchaven, 455 C.I.D., Micro Level, Howell EBL-EFI Spark Control, Macerator, York Air Compressor, 6 Wheel Disc, Quadra Bag, Onan W/Bovee Ignition
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| Re: Onan Primer Fuse [message #368462 is a reply to message #368458] |
Sat, 15 January 2022 09:43 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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JohnL455 wrote on Fri, 14 January 2022 18:39Not to pee in your cornflakes, but that’s a mod I would NEVER do. Look at the size of the fuel pump compared to the carb bowl that only holds a few thimbles of fuel. If your float sticks you will be blindly pumping fuel everywhere with the primer. Without it, if float sticks it will start then flood out and die, prompting you to go inspect the situation. After 6 months non use, mine starts within 5 seconds of cranking anyway. But my choke is set correctly.
John,
Even as deaf as I am, I can hear the Bendix pump clicking and sometimes it take a while to slow down. When the clicking has slowed down, then she will fire on the second compression. Before I had the prime circuit, it could take a while and with the little battery I had for that service (an old 23 remember) cranking could get slow before she fired at all. A good mod in my book.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| [GMCnet] Re: Onan Primer Fuse [message #368463 is a reply to message #368462] |
Sat, 15 January 2022 10:16 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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We sell lot of these Onan Prime switch kits and receive lot of positive
feedback.
Keep in mind the pump is LOW Pressure so there is less chance of flooding.
When they were new, all the items on fuel delivery system worked, so the
prime pump was not necessary.
Grace would push the prime pump and count to 10 then hit the starter switch
and fires up almost immediately.
On Sat, Jan 15, 2022 at 7:43 AM Matt Colie wrote:
> JohnL455 wrote on Fri, 14 January 2022 18:39
>> Not to pee in your cornflakes, but that’s a mod I would NEVER do. Look
> at the size of the fuel pump compared to the carb bowl that only holds a
>> few thimbles of fuel. If your float sticks you will be blindly pumping
> fuel everywhere with the primer. Without it, if float sticks it will start
>> then flood out and die, prompting you to go inspect the situation.
> After 6 months non use, mine starts within 5 seconds of cranking anyway.
> But my
>> choke is set correctly.
>
> John,
>
> Even as deaf as I am, I can hear the Bendix pump clicking and sometimes it
> take a while to slow down. When the clicking has slowed down, then she
> will fire on the second compression. Before I had the prime circuit, it
> could take a while and with the little battery I had for that service (an
> old
> 23 remember) cranking could get slow before she fired at all. A good mod
> in my book.
>
> Matt
> --
> Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL,
> GMCES
> Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum
> Brakes with Applied Control Arms
> SE Michigan - Near DTW - Twixt A2 and Detroit
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>
--
Jim Kanomata ASE
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.gmcrvparts.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: Onan Primer Fuse [message #368467 is a reply to message #368458] |
Sat, 15 January 2022 19:41 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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Actually I have the opposite view. On mine I can hold the prime switch WITHOUT CRANKING the engine I can hear the pump running and slow down when the carb is full. It is a very slow click when it is full. The one time I never heard it slow down was because of a stuck open float / needle and seat. I found out about it with ever trying to start the engine.
My airplane uses the same Bendix pump. The pre-start checklist from Grumman says to start the electric pump. Listen for it an read the fuel pressure gauge for 4-6 PSI. Then use the injection system to squirt fuel direct into the cylinders and start the engine.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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