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Onan B43 Fuel Pump ?


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#1 Bud OFFLINE  

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Posted September 06, 2014 - 04:28 PM

I am not familiar with the Onan engine and so far not very impressed with working on it. The fuel pump mounted on the side shroud has an in and an out hose connect at the top and a blocket off hose connect at the bottom. The very over priced rebuild kit I got for it has the outlet hose connect but it is not open. Should I drill it out or an I supposed to reroute the outlet hose to the bottom preveously unused connector? Is everyone confused now?



#2 Auburn David OFFLINE  

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Posted September 06, 2014 - 06:57 PM

Wow I have no clue,I have never fooled with an Onan,Not rich enough to buy the parts for one...LOL


Edited by Auburn, September 06, 2014 - 06:57 PM.

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#3 Auburn David OFFLINE  

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Posted September 06, 2014 - 06:59 PM

This link might be of help,seems others are confused as well..LOL http://www.wheelhors...onan-fuel-pump/


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#4 toppop52 ONLINE  

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Posted September 06, 2014 - 07:49 PM

Also check ASAP in PA for Onan parts, very reasonable, they are great engine.
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#5 superaben OFFLINE  

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Posted September 06, 2014 - 08:10 PM

Bud, I suspect that you have the wrong kit.  Onan is very particular about making parts change without rhyme or reason.  It all goes by the "spec" number.  Two B43's will sit side by side and have differences that no other make would ever do without changing the model number. 

 

That's Onan for you. 

 

I sold a fuel pump kit to a guy that had his spec number off by one letter.  That one letter also changed the carburetor and intake manifold.  His fuel pump kit had something different, I forget what it was, and we were both stumped until we realized that the spec number was different.

 

Ben W.


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#6 gopher OFFLINE  

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Posted September 06, 2014 - 08:25 PM

Sounds like you have the kit for pump built into carburetor. The one on shroud has vacuum line hooked to back side.


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#7 FrozenInTime ONLINE  

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Posted September 06, 2014 - 11:05 PM

I got rid of my pump and put on an elec. pump, works so much better.  Don't remember the part number, but it came from NAPA.


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#8 Bud OFFLINE  

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Posted September 07, 2014 - 08:19 AM

Mine does have the vaccum line on the back.  I was wondering about putting on an electric pump, not sure what that intails.



#9 Auburn David OFFLINE  

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Posted September 07, 2014 - 08:28 AM

I have put electric pumps on Kohlers and BS in the past,worked well.


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#10 Auburn David OFFLINE  

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Posted September 07, 2014 - 08:33 AM

Just have to use the low pressure pumps,I think they are 2.5psi or so.

 
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#11 gopher OFFLINE  

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Posted September 07, 2014 - 05:58 PM

If you go electric don't forget to block off the vacuum line.


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#12 FrozenInTime ONLINE  

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Posted September 07, 2014 - 10:33 PM

If you go electric don't forget to block off the vacuum line.

 

I left the old fuel pump on the motor with the vacuum line still attached.  Hope that is good.


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#13 gopher OFFLINE  

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Posted September 07, 2014 - 11:14 PM

I left the old fuel pump on the motor with the vacuum line still attached.  Hope that is good.

As long as the rubber diaphragm in the pump not broken contaminants can not make its way into oil. 


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#14 ol' stonebreaker ONLINE  

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Posted September 08, 2014 - 07:25 AM

When I got my welder the bottom inlet conn was broken off. I drilled and tapped it to 10-24 to plug it and drilled out the top inlet for the hose conn and it works fine. Don't know if this helps you, Bud.
Mike
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