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post #1 of 15 Old 08-03-2015, 12:06 PM Thread Starter
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16G fuel pump issues

Ok, got the G back together and went to fire it. Put a little gas in the carb and she started right up for 5 sec. Did it again and again and not seeing fuel coming through inline filter. Removed fuel pump to carb side and turned motor over and nothing coming out. It has sit for about 3 months while restoring process and carb was removed and rebuilt/cleaned. My guess is that the fuel evaporated out of the fuel pump and diaphragm is dry/cracked and not pumping fuel. I have never pulled one of these apart is there a rebuild kit for them on the M18? Anyone ever done one ? She will not run without fuel to the bowl!

thanks!
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post #2 of 15 Old 08-03-2015, 06:09 PM
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Re: 16G fuel pump issues

Just buy a new fuel pump. I don't know if anyone has kits, but its not worth the trouble in my view.

They have little rubber flapper check valves in them - they are likely stuck or broken - and yes if it was old, and you let it dry out, the check valves or the diaphragm have now failed.

This is why I don't believe in fuel shut off valves or running engines dry for storage.

Sheldon

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post #3 of 15 Old 08-03-2015, 07:41 PM
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Re: 16G fuel pump issues

Try this site, Information about the Carter, Kohler and Walbro Carburetors, Various Fuels and Fuel Systems

Page down and you will find fuel pumps.

Faux Pas are my forte

Last edited by beaner2u; 08-03-2015 at 07:50 PM.
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post #4 of 15 Old 08-03-2015, 09:27 PM
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Re: 16G fuel pump issues

I'd never changed a fuel pump on an M18S. When I needed a new one it took me about a half hour. I bought a new supposedly OEM pump on eBay for not a lot of money. The only fiddling was with the fuel line connectors; they fit a variety of M18S flavors so you have to set them for the Gravely application. That took less than 5 minutes. After that, all the time was in removing and replacing the tins and fiddling with the lower mounting screw for the pump. Hard to see with trifocals so it became a matter of (literally) feeling my way through it.

All in all a very doable job.

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post #5 of 15 Old 08-04-2015, 09:22 PM
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Re: 16G fuel pump issues

I'm about to change my first fuel pump on the Subaru Robin EH65. It has always had cold start issues. The original owner said that he replaced the fuel pump only to find out that his starting issues were related to a fuel filter with too fine filtration. Swapping out the fuel filter solved the issue. My no-start issues, which started about three weeks ago occurred after the machine was sitting for a while (using a 2-wheeler to cut grass mostly). Further investigation yesterday showed that the pump was not pumping when disconnected from the carb. The plastic fuel pump that is on it (Mitsumi brand?) does not appear to be serviceable, so I ordered a new metal OEM one and will be installing it this week.

Thanks.

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post #6 of 15 Old 08-06-2015, 09:47 AM Thread Starter
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Got a new pump ordered and on the way.
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post #7 of 15 Old 08-15-2015, 02:57 PM
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Re: 16G fuel pump issues

Quote:
Originally Posted by PA RedRider View Post
I'm about to change my first fuel pump on the Subaru Robin EH65. It has always had cold start issues. The original owner said that he replaced the fuel pump only to find out that his starting issues were related to a fuel filter with too fine filtration. Swapping out the fuel filter solved the issue. My no-start issues, which started about three weeks ago occurred after the machine was sitting for a while (using a 2-wheeler to cut grass mostly). Further investigation yesterday showed that the pump was not pumping when disconnected from the carb. The plastic fuel pump that is on it (Mitsumi brand?) does not appear to be serviceable, so I ordered a new metal OEM one and will be installing it this week.
Not to hijack this thread, but my new fuel pump arrived today. Installed it and I am getting very sporadic fuel delivery on the output side of the pump. The battery was tired and it had been sitting, so I put it on the tender. Replaced fuel filter. Where to look next? I'm hoping I don't have an issue with crankcase vacuum.

TIA.

Thanks.

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post #8 of 15 Old 08-15-2015, 03:13 PM
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Re: 16G fuel pump issues

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Originally Posted by PA RedRider View Post
Not to hijack this thread, but my new fuel pump arrived today. Installed it and I am getting very sporadic fuel delivery on the output side of the pump. The battery was tired and it had been sitting, so I put it on the tender. Replaced fuel filter. Where to look next? I'm hoping I don't have an issue with crankcase vacuum.

TIA.
Have you checked the pickup tube in the tank? I believe it has a screen on it - blow some air back through the line.

Sheldon

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post #9 of 15 Old 08-15-2015, 05:10 PM
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Re: 16G fuel pump issues

I actually considered that possibility, but never have had any issues with the G-sereis pickup tubes/screens getting clogged. But Eureka, your suggestion worked. I'm now getting significant fuel flow on the output side of the new fuel pump and the tractor roared to life after a couple cranks and about two months of sitting. I probably should have tried this first before springing for a fuel pump, but mine was old and not serviceable. Great suggestion. Thanks for chiming in.

Thanks.

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post #10 of 15 Old 08-15-2015, 05:47 PM
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Re: 16G fuel pump issues

Glad you found the problem, happy to help.

Sheldon

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post #11 of 15 Old 08-16-2015, 02:02 AM
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Re: 16G fuel pump issues

What I would do is to remove the tank and the valve. Then pressure wash the inside of it. Checkfor any leaks, and reinstall. Ther reason is that the crud that occluded the screen is still in the tank and it will eventually clog it again.

Also get rid of any ethanol fuel and run pure gas. That will keep future corrosion down to a minimum.

Code:
                              Current Inventory
   24G (Onan 24hp)    24GLX - was 16G  (Onan 24hp)   8249 - was 8129 (Onan 24hp)
        818T (Onan 18hp B48)       8163T - was 8123 (Onan CCKA) 
                              8183T (Onan B48)
   5665 w/brakes        5665        5660        Pro-8         Pro-16 w/brakes

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post #12 of 15 Old 08-16-2015, 10:42 AM
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Re: 16G fuel pump issues

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Originally Posted by Richard-tx View Post
What I would do is to remove the tank and the valve. Then pressure wash the inside of it. Checkfor any leaks, and reinstall. Ther reason is that the crud that occluded the screen is still in the tank and it will eventually clog it again.

Also get rid of any ethanol fuel and run pure gas. That will keep future corrosion down to a minimum.
Richard, cleaning the tank is a good idea, but like my tractor, his tractor has the top siphon plastic tank, not the metal tank - there is no shutoff valve. I don'y know that a pressure washer would be a good idea with the plastic tank?

And I still don't have all these problems with ethanol fuel everyone talks about?

Sheldon

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post #13 of 15 Old 08-16-2015, 01:09 PM
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Re: 16G fuel pump issues

Since you have a plastic tank and you don't suck stuff off the bottom, it would be interesting to see if you have some water laying in there and you just don't know it....yet.

My point is that something was blocking the pickup tube. Blowing it back cleared it but whatever blocked it is still in there and it will rear it's ugly head again.

Code:
                              Current Inventory
   24G (Onan 24hp)    24GLX - was 16G  (Onan 24hp)   8249 - was 8129 (Onan 24hp)
        818T (Onan 18hp B48)       8163T - was 8123 (Onan CCKA) 
                              8183T (Onan B48)
   5665 w/brakes        5665        5660        Pro-8         Pro-16 w/brakes

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post #14 of 15 Old 08-16-2015, 02:12 PM
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Re: 16G fuel pump issues

I've never pulled a G-series tank and done anything with it. Never had the need to. However, I'd consider pulling this one and transferring the contents through a coffee filter and funnel into another container and back just to mitigate future problems. If there's water that might not buy me much.

What I've noticed with this machine, is I can't run the tank down to empty. It will hit the 1/4 mark and begin to act like its empty. I never gave it much thought until now.

EDIT: Maybe we all need one of these Mr. Funnels, which even separates out water.

http://www.amazon.com/Mr-Funnel-AF3CB-Fuel-Filter/dp/B000SOIRCG

Thanks.

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Last edited by PA RedRider; 08-16-2015 at 02:26 PM.
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post #15 of 15 Old 06-19-2019, 03:34 PM
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Re: 16G fuel pump issues

Quote:
Originally Posted by ATLANTIC CENTRAL View Post
Have you checked the pickup tube in the tank? I believe it has a screen on it - blow some air back through the line.

Sheldon
Haha, Fantastic. Briiliant!

So simple. After troubleshooting for days, this fixed the problem.

Thank you so much

Gari
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