Onan Primer Fuse

[Tom Katzenberger]

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

 

[Tom Katzenberger]

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

 

[Tom Katzenberger]

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

 

[Ken B]

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

 

[john r. lebetski]

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

 

[Tom Katzenberger]

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

 

[Matt Colie]

> 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

 

[jim kanomata1]

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.

> > 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
http://www.gmcrvparts.com
1-800-752-7502

 

[Ken B]

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