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4hp briggs dies after 5-7 minutes won't restart


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#1 Kmac1 ONLINE  

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Posted September 18, 2015 - 10:44 PM

Co Man on my rig has a McClane reel mower with 4 hp Briggs & Stratton belonged to his dad and had not been started for sometime.  I told him I would look at it.  I primed it and it fired, ran and died.  I took the carb off cleaned it replaced the diaphragm, gapped the coil, and put it back together.  cleaned out the gas tank and put new gas in it.  Set the choke pulled it one time fired and ran good, set the idle screw and let it run for 3-4 minutes.  shut it down told him it was ready to go and he came and got it.  (mind you I did all this on location in west texas with minimal tools no compressed air and carb cleaner.) He took it to his trailer on the other side of loc and pulled it once and it started and ran for 5 minutes, died and would not restart. I checked it, no fuel, good spark.  would not stay running even when primed.  let it sit for a day or two and it will start and run just like before if primed, runs 5-7 minutes dies and wont restart.  It is a horizontal carb attached to the fuel tank.  I replaced the gasket between the tank and carb when I put the new diaphragm in.  Any ideas or suggestions on what to look at or look for would be appreciated. 



#2 Jack OFFLINE  

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Posted September 18, 2015 - 11:41 PM

Fuel cap vented?  Wild guess... Good luck.


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#3 bbuckler OFFLINE  

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Posted September 18, 2015 - 11:50 PM

Sounds like it running lean. Gas Cap , maybe the adjustment is still off or maybe the intake gasket.



#4 stiemmy ONLINE  

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Posted September 19, 2015 - 05:12 AM

Does the carb have a fuel pump on the side? If it does, I'd look at that.

Also, I'd look at the pickup tube. Those often get clogged in the middle, on the end screen, and or both. Cheers
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#5 boyscout862 OFFLINE  

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Posted September 19, 2015 - 05:46 AM

I would suspect the cap, a pump, or the pickup tube. Forty years ago it was common to have to replace those tubes. Good Luck, Rick

 

Some times I was able to clean the tube while still attached, by spraying Gumout in through a passage from above. Its when you pull the tube out that you have trouble trying to put them back in. They get damaged.


Edited by boyscout862, September 19, 2015 - 05:49 AM.

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#6 Alc ONLINE  

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Posted September 19, 2015 - 06:00 AM

Rick don't those pickup tubes have a check valve in to make the fuel pump work ?

#7 stiemmy ONLINE  

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Posted September 19, 2015 - 07:53 AM

Been a while since having one apart, but myself, I don't ever recall seeing a check in there.
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#8 Bruce Dorsi OFFLINE  

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Posted September 19, 2015 - 08:08 AM

If you didn't clean the screens at the bottom of the fuel pick-up tubes, that is most likely to be the problem.

 

"Lint" or dried gas can clog these screens, and hinder fuel siphoning.

 

There is a "reservoir" in the top of the gas tank which needs to be clean. 

 

If the cap & spring are installed on the wrong side of the diaphragm, the engine may start, but not run properly.

 

A clogged gas cap vent will also cause this problem. 


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#9 Alc ONLINE  

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Posted September 21, 2015 - 05:23 AM

 

Been a while since having one apart, but myself, I don't ever recall seeing a check in there.

I thought some did but wasn't sure , did a little web searching ,it looks like it depends on the carb model ,and there might be ones that don't even  within the models , it looks like the Vacu-Jet w/auto choke has the check ball . 

 

http://outdoorpoweri...to_all-temp.asp

 

 

I was thinking maybe the check ball worked along with the fuel pump

Attached Thumbnails

  • pickup tube.gif

Edited by Alc, September 21, 2015 - 05:25 AM.

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#10 Kmac1 ONLINE  

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Posted September 23, 2015 - 10:13 PM

Thanks for all replies. Have had a chance to look at it again. I did replace the diaphragm on the side, cleaned the pickup tube screen and replaced the gasket between tank and carb. I'll post what I find when I get back on it. Thanks again
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