Onan fuel pump ??

Darrel · June 24, 2016, 04:43:36 PM

I'm looking for a replacement fuel pump for my Onan 24 horse. Does anyone know of an electric pump that I could replace the old vacuum operated pump? Wood-Mizer will sell me the old style pump for about $90. Or should I just buck up and lay the $$ down.

MartyParsons · June 24, 2016, 07:42:16 PM

Hello,
These fuel pumps are used on many engines just not Onan. I think you could find one less expensive at any small engine shop. Kohler, Briggs \ etc would use this same pump. I can get you the part # on Monday and post.

Hope this helps.

Marty

Kbeitz · June 24, 2016, 07:42:54 PM

Any low pressure pump electric will work...
But check E-bay for the right pump...
You will surprised to see how cheap you can get one.
I don't like the electrics on small engines. The engines just don't seem to run right with them.
You will need to plug and maybe drill your old pump if you go electric.

Kbeitz · June 24, 2016, 07:44:42 PM

Quote from: MartyParsons on June 24, 2016, 07:42:16 PM
Hello,
These fuel pumps are used on many engines just not Onan. I think you could find one less expensive at any small engine shop. Kohler, Briggs \ etc would use this same pump. I can get you the part # on Monday and post.

Hope this helps.

Marty

Most Onans take a pump that mounted on the carb and they are different.

Chuck White · June 24, 2016, 07:50:27 PM

The fuel pump that I had on my Onan was thin and it was rectangular shaped.

When it went out, I went to the local lawn mower shop and bought one that had 3 stems on it, one was vacuum, one was in, and the other was out!

If I remember correctly, it ran about $15.00.

It has 2 screw holes for mounting, but I only mounted it with one screw because of the curvature on the cowl of the engine!

Darrel · June 25, 2016, 12:19:32 AM

This fuel pump is the thin one that mounts on the coweling. I'll be heading into Klamath Falls on Monday and will have to see if I can find it.

1ruralmailman · June 25, 2016, 07:20:13 AM

the engine shops around here are in what i call collusion.when the one on my onan went out they all insisted i had to buy the whole pump for around 90 dollars.i got *pithed walked out,went home cleaned it off found out it is a walboro pump with numbers on it.did a little keyboard time found out you can buy the repair kits for 10 bucks direct from them.bought two,have a spare hanging in my shop now.the other one i took package and all back to town went into the shop and showed them what i had,they went white in the face.i told them times have changed,you cant put the screws to folks like that,because folks will find a way with the internet to get around being bent over.they didnt like me much for telling them this.i dont mind folks making a living,but this seemed a little greedy to me.

Chuck White · June 25, 2016, 07:29:34 AM

I was told at the small engine/lawn mower shop that the pump I bought was originally made for the DR© equipment!

I think that if you were to go look at riding lawnmowers, you would see the pump like I got!

Kbeitz · June 25, 2016, 07:54:56 AM

Ah ha.... Someone got you...
They are only $7.69 abd free shipping on e-bay....
Not only can find a way with the internet you gotta be good at it.

Dont get mad ... Just playing with ya

pineywoods · June 25, 2016, 09:11:22 AM

The small electric fuel pumps work well IF you get the right one. Needs to put out no more than 3 psi. Some of them will pump up 30 psi, carb don't like that. I went electric on my mill motor. Makes a difference on starting when the carb is full of fuel before cranking..

ladylake · June 25, 2016, 03:41:01 PM

If you get a electric fuel pump get the rotary style rather than the square pulse type which don't last at all, the rotary ones run for years. Steve

Darrel · June 25, 2016, 11:16:53 PM

Thanks for the replies. I'll keep you posted as to how I solve my problem. Right now I have logs to saw and a brand new box of blades and am at a stand still. I must get the mill up and running on Monday.

Darrel · June 26, 2016, 03:51:40 PM

So I take the fuel pump off again and look it over carefully and notice that it says "Made in Japan" on the back and the word "Nikki". There is also a very small hole in the back that's about 1/64" in size that I'm sure is just the way the pump was made. I put my finger over the hole and the pump works, remove my finger and it stops working. I got excited thinking that I had found a temporary fix but now am hesitant to run the mill for fear that the purpose of the hole may be to prevent fuel getting into the crank case in the event that the integrity of the diaphragm is compromised.

I'm thinking that there has to be some very good reason why the pump stopped working in the first place and most likely it's because the diaphragm is already compromised.

1ruralmailman · June 26, 2016, 04:46:08 PM

that is the case.there shouldnt be gas on that side of the diaphram. i would bet if you start doing some research you might be able to find the rebuild kit for it online somewhere.

Delawhere Jack · June 26, 2016, 06:26:08 PM

Quote from: pineywoods on June 25, 2016, 09:11:22 AM
....Makes a difference on starting when the carb is full of fuel before cranking..

AH HA!! And thank you! I wonder if mine is leaking back down towards the pump. It's been a little reluctant to start after sitting lately.

ladylake · June 26, 2016, 06:41:28 PM

Quote from: Darrel on June 25, 2016, 11:16:53 PM
Thanks for the replies. I'll keep you posted as to how I solve my problem. Right now I have logs to saw and a brand new box of blades and am at a stand still. I must get the mill up and running on Monday.

If you don't have parts to repair or replace your pump by Monday morning go get a rotary electric pump from your local auto parts store, make sure its low pressure. You most likely will never have trouble again. Steve

tnaz · June 28, 2016, 06:33:05 AM

Did you get it fixed?

Darrel · June 30, 2016, 05:09:42 PM

I did get it fixed! Got it fixed on Tuesday, ran it on Wednesday then had to wait 'till I went to town to upload the picture. Works great!

Now if only I could get the rest of the old mill to work as well as the fuel pump does. So one thing at a time and sooner or later, I'll get there!

tnaz · June 30, 2016, 05:24:42 PM

Good to hear; and hopefully not a lot of $$$. :D 8)

Delawhere Jack · June 30, 2016, 05:30:50 PM

Quote from: Darrel on June 26, 2016, 03:51:40 PM
...but now am hesitant to run the mill for fear that the purpose of the hole may be to prevent fuel getting into the crank case in the event that the integrity of the diaphragm is compromised.

On a related note. Always leave the little bleeder screw on the gas tank .cap open when it's on the mill. Others have mentioned getting a crankcase full of gas from thermal expansion in the tank pushing gas through the carb.

ladylake · June 30, 2016, 05:33:09 PM

Even if it cost a bit that looks like a rotary pump which should last for years, I tried a couple of those square pulse type pumps on my mill and they never lasted more than 3 months. Steve

Darrel · June 30, 2016, 07:29:00 PM

Quote from: Delawhere Jack on June 30, 2016, 05:30:50 PM
Quote from: Darrel on June 26, 2016, 03:51:40 PM
...but now am hesitant to run the mill for fear that the purpose of the hole may be to prevent fuel getting into the crank case in the event that the integrity of the diaphragm is compromised.

On a related note. Always leave the little bleeder screw on the gas tank .cap open when it's on the mill. Others have mentioned getting a crankcase full of gas from thermal expansion in the tank pushing gas through the carb.

I put a shutoff valve in the line to prevent that very thing.

Quote from: ladylake on June 30, 2016, 05:33:09 PM
Even if it cost a bit that looks like a rotary pump which should last for years, I tried a couple of those square pulse type pumps on my mill and they never lasted more than 3 months. Steve

It is a rotary pump and cost me less than $30 at Napa. I turn the key on and it starts pumping. No more cranking waiting for gas to get to the carb. I'm lovin it.