Super A Fule Flow Through Sediment Bowl

CGID · Jul 7, 2015

The shut-off valve on the original was leaking. The valve on new aftermarket sediment bowl assemblies is not compatible with the seat on IH originals so I changed out the entire original sediment bowl assembly with a new aftermarket one. It worked fine for a few days then began to leak around the bowl seat. I applied some sealer around the lip of the bowl. It's a neat job - no sealer anywhere but around the bowl lip. Without the bowl in place the gas runs out just fine. With the sealed bow held in place, the gas runs out just fine. But, a little upward, hand pressure on the bowl will slow the gas-flow to a trickle. Tightening the bail will cause it to slow down a little more. The filter screen does not block the slots where the gas should flow out of. I have another new gasket and filter screen. Assembled with them, without sealer, the same fuel flow problem occurs.

Bouncer · Jul 7, 2015

You are getting vapor lock. There are couple ways to cure it. Start the tractor and let what's in the carb and line burn up and it should start flowing once the carb bowl is empty and the air pocket moves. The other way is tank the gas cap off and crack the fuel line on the carb and bleed it. It is also possible you might have to do a combination of both mentioned above.

Janicholson · Jul 7, 2015

Even with the air in it the fuel will flow. Get it as full as possible and in a week it will be gone. Jim

old · Jul 7, 2015

Think of it this way. If you take a soda straw and put your finger over the end then put it in a glass of soda the straw does not fill up with soda. Why because it is already full of something. AIR Same thing happens to the sediment bowl. Carb float is holding the needle closed so the sediment bowl when tight is full so yes the gas can not fill it up because 2 things can not be in the same place at the same time. AIR is in there till the float needle drops and lets the flow of fuel go into it

CGID · Jul 7, 2015

I opened the gas line at the carburetor and that took care of the problem. Thank you all. But, I'm curious now. When I park the tractor I always shut the gas off at the sediment bowl and let the engine run itself out. The sediment bowl stays full, but the line is empty. Why don't I have this problem all the time?

Andy Martin · Jul 7, 2015

When you shut it off while running, there is no way for vapor to let the sediment bowl empty, so it stays full even though the fuel line may have drained. When you turn it on, the float is down and fuel will flow into the carburetor and vapor will discharge out the carburetor vent until the needle valve shut sit off. When you get a vapor lock in the sediment bowl, ignore it. Starting the engine will drain the carburetor and let vapor into and out of the carburetor. You'll never know it cleaned itself out.

old · Jul 7, 2015

READ what I said in my first post your not understanding the laws of physics. Air is in fact a fluid and no 2 fluids can be in the same space at the same time. Pull the sediment bowl off dump it then turn the gas and and try to start the tractor. Bet it starts right up and the sediment bowl then fill up so your problem is not the tractor or the sediment bowl it is all in your mind

CGID · Jul 7, 2015

What had me fooled was, I had the sediment bowl assembly on and off a couple of times during this project; to change fittings and to alter the valve handle for clearance. Those times, this fuel flow problem didn't occur. And if it happens when starting after running the line dry, I never notice it. Two fluids of the same phase can occupy the same space by dissolving or recombining and the combined volume may be less than the sum of the two individual volumes. Dissolution of a gas into a liquid can occur with nearly imperceptible change in volume.

old · Jul 7, 2015

NO two fluids air and gas can not be in the same place and on a gravity system not enough pressure to make the gas fill the bowl due to the air in it. Been doing this way to long and know what is what

CPACy · Jul 8, 2015

Being new to having a gas tractor, if I don't run it but once every month or two, is this the way go?
Turn off the gas at the bowl and let the fuel line empty? Pros/Cons of doing this?

Arnold Layne · Jul 8, 2015

"Air is in fact a fluid", what?? Since the atmosphere is made up of gases and is quite compressible, how, in fact, did you come up with this one?

old · Jul 8, 2015

You best go take a science lessen young one

Indiana George · Jul 8, 2015

Air is not liquid.It is mostly nitrogen and oxygen.And the only way nitrogen becomes liquid,
the temp has to drop something like -300 f.

CGID · Jul 8, 2015

I do it that way because that's how the original owner did it. I believe it will help prevent build-up of a varnish-like deposit gas leaves when it dries out.

CGID · Jul 8, 2015

And don't forget to shut the electrics off after the engine stops.

CGID · Jul 8, 2015

It boils down to defining the terms gas, liquid, solid and fluid. The terms "gas", "liquid" and "solid", define the physical state or phase of a substance. "Fluid" describes its behavior. Gases are not liquid, but gases behave as a fluid. Liquids also behave as a fluid. Both gases and liquids settle to their own level. In the case of some gasses, this level may be quite a ways off of the ground. Both gases and liquids will transmit a change of pressure evenly in all directions. Settling to its own level and even transmission of pressure are properties common to fluids and both gases and liquids behave in those ways. Gases and liquids are fluids. Solids, by definition are not fluid.

Super A Fule Flow Through Sediment Bowl

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Bouncer

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Janicholson

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old

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CGID

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Andy Martin

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old

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