6.5 Briggs Fuel in crankcase - MyTractorForum.com - The Friendliest Tractor Forum and Best Place for Tractor Information
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post #1 of 18 Old 01-14-2019, 04:34 PM Thread Starter
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6.5 Briggs Fuel in crankcase

I have a Troy-Bilt 3250w generator with 6.5hp Briggs that was leaking fuel out of carb, and into crankcase.

I drained crankcase, let it air dry for 2 days and replaced needle valve /seat.

That did not solve the problem.

I then replaced the carb, drained and refilled with oil again.

Same problem.

What are the next steps in troubleshooting this problem ?
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post #2 of 18 Old 01-14-2019, 06:22 PM
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Re: 6.5 Briggs Fuel in crankcase

Put a shut off valve in the fuel line.

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post #3 of 18 Old 01-14-2019, 06:39 PM
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Re: 6.5 Briggs Fuel in crankcase

In looking up that model Troy generator it shows having a fuel shutoff under the tank from the factory. You might pull the hose off at the carb and make sure the valve really is cutting off fuel flow when off.
Have you check the float level of the old carb after replacing the needle and seat and of the new one ? Just because it's new doesn't mean it was set up correctly.
Just hard to imagine that much gas getting into crankcase.

.

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JD 160 38" mower & JD 185 38" blower
Craftsman 18.5 HP twin, 46" mower
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post #4 of 18 Old 01-14-2019, 07:05 PM
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Re: 6.5 Briggs Fuel in crankcase

Does this have a pulse pump on it. It could be that the diaphragm in the pump is leaking into the crank case. Engine model number would help to confirm either a pump or carb issue.

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post #5 of 18 Old 01-14-2019, 07:13 PM
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Re: 6.5 Briggs Fuel in crankcase

Should just be gravity and it's a basic OHV Briggs.

.

1952 Ford 8N
JD 160 38" mower & JD 185 38" blower
Craftsman 18.5 HP twin, 46" mower
Toro WH 256-6 38" deck w/tiller and blower
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post #6 of 18 Old 01-15-2019, 05:16 AM Thread Starter
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Re: 6.5 Briggs Fuel in crankcase

Generator does have functioning shut off valve.

I replaced fuel line when I replaced carb.

Pic in previous post is the generator. with 900series 6.5 Briggs

Engine model is not readable,as it is engraved/stamped on the heavily rusted ohv/rocker cover.

I tried for hours to read,research,contacted Troy-Bilt, Briggs etc.

Tried to remove rocker cover, and was so tght I fearded bending it trying to remove.

Finally found a video on youtube of a guy repairng a gen exactly like mine that had been sitting a long time.

He replaced carb as it was severly fouled up from corrosion.

Luckily he put a link to dealer with carb model number in the video.

Last edited by bonegunner; 01-15-2019 at 05:30 AM. Reason: typo
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post #7 of 18 Old 01-15-2019, 06:08 AM
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Re: 6.5 Briggs Fuel in crankcase

Is there a anti backfire solenoid coming in at the bottom of the carburetor bowl?...If there is you would see a wire going to the bottom of the carb bowl...if that is present it is not working properly......if you drain the gas and unscrew the fitting you should see the piston ride out and in when the key is switched back and forth if it is working. This is not an uncommon problem on gravity fed system......if it does not work....either replace it, or as suggested, install a shut off valve in a convenient place and don't forget to use it
This is from a kohler...but it would look something like this
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Last edited by MARK (LI); 01-15-2019 at 06:23 AM.
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post #8 of 18 Old 01-15-2019, 07:09 AM Thread Starter
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Re: 6.5 Briggs Fuel in crankcase

No solenoid wires on carb.
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post #9 of 18 Old 01-17-2019, 05:00 AM
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Re: 6.5 Briggs Fuel in crankcase

Their is a gas valve petcock on the bottom of the fuel tank on gravity fed generators (and others also) to prevent your issue.

You can also install a in-line fuel cutoff.
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post #10 of 18 Old 01-17-2019, 05:04 AM
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Re: 6.5 Briggs Fuel in crankcase

Quote:
Originally Posted by MARK (LI) View Post
Is there a anti backfire solenoid coming in at the bottom of the carburetor bowl?...If there is you would see a wire going to the bottom of the carb bowl...if that is present it is not working properly......if you drain the gas and unscrew the fitting you should see the piston ride out and in when the key is switched back and forth if it is working. This is not an uncommon problem on gravity fed system......if it does not work....either replace it, or as suggested, install a shut off valve in a convenient place and don't forget to use it
This is from a kohler...but it would look something like this
A antiback fire solenoid valve WILL NOT prevent crankcase flooding if carb needle seat is leaking. That is not it's purpose nor intent.


You can review such online.
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post #11 of 18 Old 01-18-2019, 01:30 PM
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Re: 6.5 Briggs Fuel in crankcase

I know what it is for, ..as name implies, it is supposed to prevent backfiring by cutting off fuel supply from the bowl within the carb when key is turned off but if it does hang open it can allow flooding...kind of grasping for a solution

Usually the needle valve and its seat causes it...but OP says he changed that...I just wonder if he put seat in upside down....or if the float is not "floating" for some reason

Last edited by MARK (LI); 01-18-2019 at 01:44 PM.
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post #12 of 18 Old 01-18-2019, 02:00 PM
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Re: 6.5 Briggs Fuel in crankcase

Quote:
Originally Posted by bonegunner View Post
I have a Troy-Bilt 3250w generator with 6.5hp Briggs that was leaking fuel out of carb, and into crankcase.

I drained crankcase, let it air dry for 2 days and replaced needle valve /seat.

That did not solve the problem.

I then replaced the carb, drained and refilled with oil again.

Same problem.

What are the next steps in troubleshooting this problem ?
If you didn't flush the fuel line before reconnecting, you may have a small chunk of crud that broke loose. The chunk will go directly to the needle/seat and may prevent it sealing. BTDT.
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post #13 of 18 Old 01-18-2019, 04:09 PM
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Re: 6.5 Briggs Fuel in crankcase

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Originally Posted by Bill Kapaun View Post
If you didn't flush the fuel line before reconnecting, you may have a small chunk of crud that broke loose. The chunk will go directly to the needle/seat and may prevent it sealing. BTDT.
Right: gas is still getting past the Carb floats needle and seat. I've seen engines run and operate ok with just a seep or slight leak because the gas was being consumed by the engine. Kill the engine and sometime later the crankcase MAY flood. Sometimes it's intermittent and erratic. If the engine runs and operates ok just install a fuel shutoff and move on.

This is why gravity fed fuel systems need a fuel petcock.
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post #14 of 18 Old 01-18-2019, 04:17 PM
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Re: 6.5 Briggs Fuel in crankcase

Quote:
Originally Posted by MARK (LI) View Post
I know what it is for, ..as name implies, it is supposed to prevent backfiring by cutting off fuel supply from the bowl within the carb when key is turned off but if it does hang open it can allow flooding...kind of grasping for a solution

Usually the needle valve and its seat causes it...but OP says he changed that...I just wonder if he put seat in upside down....or if the float is not "floating" for some reason
If the antibackfire solenoid pintle hangs open it won't cause the crankcase flooding. The gas is getting past the carb float needle and seat.

I've purposely cut off the pintle needle end on antibackfire solenoids so as the carb could be used on a non- 12v engines.

Can you explain how you think a antibackfire solenoid hanging open would be the primary reason for crankcase flooding?
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post #15 of 18 Old 01-18-2019, 04:36 PM
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Re: 6.5 Briggs Fuel in crankcase

On a side note fellows the afterfire solenoid do not operate the same as mower engines. It activates on shutdown until the generator is fully shutdown then it re-opens. On mower engine when activated it retracts, on generators it extends.

As mention it would the needle valve, the seat, or both that causing the leaking. A hang float does it too. Clean carburetor again, invert it for bench testing, and do leakdown test it should hold 7-10 psi air pressure inverted with just the weight of the float operating the needle valve to seat contact.
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