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Please Help!!! 18HP Briggs Twin Just Doesn't Run! Grrrr!


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#1 jdslednut OFFLINE  

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Posted June 21, 2011 - 09:10 PM

I stopped by my friend's place today to see what's wrong with the 18HP B&S I rebuilt for his Schweiss. The dang thing starts with full choke, only runs with full choke and then dies after a few seconds. I took the carb off and cleaned it and everything little hole looks nice and clean. I also installed a new fuel pump kit (again) with no luck. Everything measured up to spec inside and I replaced the rods, rings, seals, gaskets, gave it a valve job, about everything but the pistons. It ran fine while I had it but has seemed to gradually (fairly quickly I guess) refuse to run. I've adjusted the hell out of the carb and that did nothing. Compression is 75 on one side and about 73 on the other. Any ideas out there? I'm at a loss.

I traded my rebuilt engine and install for his Case 210 and have about $200.00 in rebuild costs. I feel like just returning the Case and calling it a loss but I feel I'm in too deep to just call it off. I'm a little sick of losing sleep over this one and just want to make it right for him. Thanks a bunch for any input of ideas you may have.

#2 MH81 ONLINE  

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Posted June 21, 2011 - 09:14 PM

Next two things I would try are taking the carb off again and checking for a warped mounting flange or a bad gasket.
It sounds like it's getting additional air from somewhere?
:anyone:

#3 NUTNDUN OFFLINE  

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Posted June 21, 2011 - 09:19 PM

It is definitely fuel and air related. I am hoping it has compression release as to the compression numbers being low?

I am with Alan on this that it is a bad gasket or something letting more air by then it should.

#4 DH1 ONLINE  

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Posted June 21, 2011 - 09:24 PM

This when I first got it would run fine, then start to loose power, then run fine again. If you closed the choke a little it would run better.
The problem ended up being lack of fuel to the carb.
The cause was the gas cap, it had a gauge in it, the float level type gauge. It fell apart inside the tank and some of the parts found there way to the fuel fitting and would restrict the fuel flow.
I fixed this without knowing, one day I decided to remove all the broken parts of it from inside the tank and no more problems with lack of power.
Maybe the same thing happening on yours??? not enough fuel flow to the carb, these carbs as you know have a fuel pump.
farmall 031..jpg
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#5 tinner OFFLINE  

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Posted June 28, 2011 - 01:40 PM

Doug beat me to it, I was going to say to check fuel flow too. I had the same problem with an old hose that had broken down inside and would restrict the flow when I went above idle.........talk about a hemorrhoid.

#6 jdslednut OFFLINE  

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Posted June 30, 2011 - 10:17 PM

Well......it was a simple problem. The fuel shut off underneath the gas tank was plugged almost tight. One more reason to check everything myself. I was humbled.

#7 MH81 ONLINE  

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Posted June 30, 2011 - 10:52 PM

Well......it was a simple problem. The fuel shut off underneath the gas tank was plugged almost tight. One more reason to check everything myself. I was humbled.


Wow, that's great that it wasn't more complicated. Sorry you had to stress over it before the problem was found.

Mental note. Check the fuel flow before assuming it's the carb or peripheral. Done.

#8 valley ranch OFFLINE  

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Posted August 11, 2011 - 03:22 PM

Good thread! Glad you tracked it down.

#9 IamSherwood OFFLINE  

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Posted August 12, 2011 - 06:47 AM

I've had a few of those valves from older tanks that had a screen that stuck up into the tank about an inch.
Anyone know if they are still available?

#10 Alc ONLINE  

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Posted August 12, 2011 - 07:03 AM

Is this what your talking about ? Picked it up at Jacktown's Engine Show this past year, about $5 . Looks like it's 1/8" pipe thread with 1/4" barb outlet.P8120549.jpg

#11 jdslednut OFFLINE  

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Posted August 12, 2011 - 08:27 AM

That's the one. Screen was busted off and valve was plugged.

#12 NUTNDUN OFFLINE  

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Posted August 12, 2011 - 09:52 AM

Very cool it was a simple fix and glad you found the problem before tearing in to too much.

#13 olcowhand ONLINE  

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Posted August 12, 2011 - 11:45 AM

Most decent shops should have the screen valves.

Fuel Fittings
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