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Fuel leaking going down hill only


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#1 daytime dave OFFLINE  

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Posted February 20, 2015 - 10:30 PM

This is puzzling me.  I have an old Simplicity 7hp walk behind two stage at my fiance's house.  It's always been a good unit.

 

This year it runs fine on level ground or going uphill, but fuel leaks out going down hill and the engine sounds like it's dying.

 

I took the bowl off and cleaned it.  I adjusted the needle screw and it was purring nicely.  

 

It ran fine on level and uphill, but downhill I could see the gas dripping off the bottom of the bowl.  Next time I get a chance to work on it, I'll leave the shroud off it and see if I can locate a source. 

 

But before I do that,

Anyone have any ideas?


Edited by daytime dave, March 01, 2015 - 07:00 PM.

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#2 MH81 ONLINE  

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Posted February 20, 2015 - 10:34 PM

Positive the bowl gasket is intact?
How about the float, is it riding low?
http://gardentractor...at/#entry519767
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#3 crittersf1 OFFLINE  

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Posted February 20, 2015 - 10:59 PM

Float level too high


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#4 WNYTractorTinkerer ONLINE  

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Posted February 21, 2015 - 12:29 AM

Might be as simple as a leaky bowl gasket..  OR..

 

Here's a scenario to consider:

 

If the float's mounting pin is on the forward pointing part of the carb / bowl and you drive downhill, the float will not raise high enough to close the inlet needle and gas will flow up into the carb throat and leak out since there is no fuel filter on it.  It will depend on how much of an angle it is used of course.  

 

As usual it is hard to say without knowing the engine type and model that we are discussing here..  


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#5 Lmiller3358 OFFLINE  

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Posted February 21, 2015 - 07:21 AM

Simple solution, don't go down hill,,, just kidding Dave,,, sounds like the float to me also !


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#6 Bolens800uk OFFLINE  

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Posted February 21, 2015 - 08:19 AM

Simple solution, don't go down hill,,, just kidding Dave,,, sounds like the float to me also !


Or reverse it downhill!

Could be the gasket failing perhaps?
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#7 daytime dave OFFLINE  

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Posted February 26, 2015 - 06:55 PM

Alan, thanks for that great video.  I checked the float as you did and it had gas in it.  A hot bath confirmed a small leak.  Thanks for the information.  While I'm at it, I'm going ahead and rebuilding the carb.  It's soaking in a gallon of Gunk Carb parts cleaner.


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#8 MH81 ONLINE  

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Posted February 26, 2015 - 07:03 PM

Alan, thanks for that great video.  I checked the float as you did and it had gas in it.  A hot bath confirmed a small leak.  Thanks for the information.  While I'm at it, I'm going ahead and rebuilding the carb.  It's soaking in a gallon of Gunk Carb parts cleaner.


Boy, I'm glad it was helpful! Good to hear you found the problem.
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#9 KennyP ONLINE  

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Posted February 26, 2015 - 07:42 PM

Glad you found the issue!



#10 daytime dave OFFLINE  

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Posted February 26, 2015 - 09:29 PM

I hope that's it Kenny.  I need to get that snow blower back in service.  The snow just keeps coming.  

 

As others had suggested, the bowl gasket was pretty bad.  I'm going to replace the fuel line and put a filter in line also.  


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#11 daytime dave OFFLINE  

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Posted February 27, 2015 - 02:50 PM

I got the blower going fine.  

 

Alan, you'll laugh at this.  I did your test yesterday and today I went to solder the problem area and the soldering gun was DOA.  I called and located a new float.  A short ride and I had the new part.  I got new fuel line and an inline filter as well.  I rebuilt the carb, adjusted the new (plastic) float and installed it.  After a few adjustments, I was in business.  I left it running on a good down hill slant and it was fine.  No leaks.  It's old and we'll see what goes next. 

Thanks for all the help fellas.

 

 

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The before cleaning picture.

 

20150226_171453_zpscaanh3m8.jpg?14250663

 


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#12 KennyP ONLINE  

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Posted February 27, 2015 - 03:53 PM

That's about what I need around here! Probably have to use the tractor and blade to get enough together for it to work, though! :wallbanging:


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#13 daytime dave OFFLINE  

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Posted March 01, 2015 - 06:59 PM

Well, things don't remain the same long.  After I finished testing it, I was not 100% happy.  There seemed to be a little too much vibration that I had never noticed before

 

Today, when I checked it, the vibration was there again.  It seemed worse.  I looked and the engine was loose.  One bolt in the front was completely gone and the other front bolt was loose.  It must have loosened more lately.  Not what I planned to do this afternoon, but snow is on the way.

 

I decided to get a fuel shut off for it as well.  After a few calls, I located a place with a fuel shut off.  I went there, got the fuel shut off, hose clamps and got a new spark plug while I was at it.  

 

Went back to the fiance's, put new bolts on the front of the engine, installed the fuel shut off and the new spark plug.

 

It fired on the first shot.  I tried it out on about 3/4 of an inch of snow and all is well.  

 

It just doesn't end.  I wish it was on a GT is all.


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#14 MH81 ONLINE  

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Posted March 01, 2015 - 08:36 PM

Glad you're back in business.
LOL on the soldering iron being NWP. Been there, done that.
Time for a new one?

Oh, and I've had more stuff loosen up the engine bolts over the last three years. :wallbanging:
All mine were vertical shaft stuff, but it makes you wonder who the little b4stard is that's running around loosening all this stuff up.
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