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Old 08-09-2007, 09:02 PM
Big-O_S13 Big-O_S13 is offline
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Briggs Carb, fuel pouring out

I have a 19.5 horse briggs motor I'm having problems with. I used the mower about a week before and did not have any problems the I tried to use it three days ago.

Motor starts fine and runs for about ten seconds then fuel starts coming out of the two vent holes right in front of the main air inlet of the carb-->motor floods out-->engine dies

If I disconnect the fuel line, it'll run real good till the carb runs out of fuel.

I rebuilt the carb ,cleaned it out real good (let it soak in carb cleaner,used compressed air in all of the holes) and it still does the same thing.

Help!!! Any input would be greatly appreciated.

Briggs 42E707-2631-E3
4 Bolt pump
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Old 08-09-2007, 09:40 PM
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Restrorob Restrorob is offline
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Did you replace the float needle valve ?
Did you check the float for fuel inside ?

Either of these could cause this problem.
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Old 08-09-2007, 10:49 PM
Big-O_S13 Big-O_S13 is offline
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Yep, I replaced the needle and checked the float (made sure there was no fluid inside and turned it upside down to make sure it was parallel to the upper part of the carb)
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Old 08-09-2007, 10:52 PM
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mike lane lawn care mike lane lawn care is offline
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if it has a fuel pump, it could be sending too much fuel into the engine
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Old 08-10-2007, 01:58 AM
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Bill Kapaun Bill Kapaun is offline
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Did you also overhaul the fuel pump portion of the carb?
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Old 08-10-2007, 07:22 PM
Big-O_S13 Big-O_S13 is offline
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yes, the parts were included in the carb rebuild kit
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Old 10-07-2007, 12:25 AM
willymoeP willymoeP is offline
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O, did you get the problem resolved? If so, can you tell me what you did to fix it? I have the same mower with the same exact problem. I've been working on it for about a week. I installed carb rebuild kit with fuel pump diaphrams and I have had the carb apart 4 or 5 times to make sure I wasn't missing something simple but don't know what to try next. Thanks!
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Old 10-07-2007, 10:48 AM
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dutch1 dutch1 is offline
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From looking at a breakdown of that carb and from what I recall, I'm thinking that carb has a nonremovable brass seat. I have had reasonable success in beveling a wooden q-tip at an angle comparable to the needle tip, lightly coating the q-tip with valve grinding compound then lapping the seat by hand or slowly with a cordless drill. With the upper carb body in the inverted position the needle and seat should hold a pressure of 5+ psi. If you have a pressure tester you might check a before and after.

And as Rob indicated check for a leaky float.

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Old 10-14-2007, 12:31 AM
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WreckRman2 WreckRman2 is offline
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Originally Posted by dutch1 View Post
I'm thinking that carb has a nonremovable brass seat.


Actually that brass seat is the cause of a lot of leaky problems and it can and should be replaced.

Part Number: 690577 (for most engines)

I made a seat remover that's basically just a long self tapping bolt with a nut and a spacer. The space needs to be wider then the seat itself. You then screw the self tapping bolt into the old seat then tighten the nut against the spacer and it will pull the seat upwards and out.

Use a hammer to LIGHTLY tap the new seat back into place.

I change about 5-6 of these per month in the field.

Last edited by WreckRman2; 10-14-2007 at 12:39 AM.
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