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Onan replacement fuel pump


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23 replies to this topic

#16 bread320i OFFLINE  

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Posted January 22, 2011 - 06:27 PM

Alright I got the pump flowing fuel. Next problem, the old fuel pump cover now becomes the fuel intake. My gasket isnt sealing the 4 corners and fuel leaks out the holes in each corner. I though I read some where that I should just fill the holes. Is the true, or did I do this wrong?

#17 mikebramel OFFLINE  

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Posted January 22, 2011 - 09:30 PM

What are you going to fill them with? Most of that RTV stuff just washes off when the gas hits it.

#18 bread320i OFFLINE  

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Posted January 22, 2011 - 09:53 PM

I was hoping to use JB weld stick

#19 NUTNDUN OFFLINE  

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Posted January 23, 2011 - 06:15 AM

I think some of the gasket maker rtv will hold up to gas. They have listed on the back whether they will hold up to gas or oil.

#20 bread320i OFFLINE  

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Posted January 23, 2011 - 01:48 PM

This morning I used some JB weld epoxy and pluged the holes. It now runs without leaking fuel. It surges at low idle, but that can be fixed another day. At least it runs now

#21 olcowhand ONLINE  

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Posted January 23, 2011 - 03:41 PM

The surging is likely just an air speed adjustment needed. Onan carbs are finicky about adjustments.

#22 DanO OFFLINE  

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Posted February 01, 2011 - 08:38 AM

Onan Carbs & Fuel Pumps can be the worst to get set right. Of all the tractors & engines I've worked on my sears SS16 with the 16 HP Onan gave me the most trouble. Mine wouldn't hold a prime, even after rebuilding it , so i had to install a Primer Bulb in the line and hand prime it before starting every time.Once it started it ran great.
I just uploaded the Manual for the 16 HP Onan Engine, maybe that will help you diagnois the problem.

#23 Alc ONLINE  

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Posted February 01, 2011 - 08:52 AM

My JD 318 is the same way , looses the prime after sitting , but last night I was helping my son with his 82 Skidoo ,in the fuel tank was a hose with a filter/check valve on the end , you could pull vacuum through it but would hold pressure blowing back , found this out the hard way when we blew the line off in the tank with compressed air !!!! Then had to fish it out!!! Thinking thats what the JD needs in the tank, Al

#24 olcowhand ONLINE  

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Posted February 01, 2011 - 04:11 PM

Onan Carbs & Fuel Pumps can be the worst to get set right. Of all the tractors & engines I've worked on my sears SS16 with the 16 HP Onan gave me the most trouble. .


The square "DD" carbs are definitely the worst of the bunch to get set right. The old SS16 I used to have needed the jets adjusted nearly every time I ran it. The carb was spotless inside too. I just got to carrying a screwdriver whenever I went to use it.




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