Perplexing issue with my ZTR

[John M]

05 Cub Cadet Commercial ZTR, 23hp Kohler Command, 2 5 gallon tanks.

Will not pump from left tank unless right has some gas in it, and will not pull from left as it should and will shut engine down if trying to run on just the left tank. What Ive done so far - Replaced fuel lines, valves and line in the tanks, new fuel pump, new vacuum line, and new filter along with new gas caps. Rerouted the left side to make the line shorter, but its not binding or getting hot or anything like that.

 

[super99]

05 Cub Cadet Commercial ZTR, 23hp Kohler Command, 2 5 gallon tanks.

Will not pump from left tank unless right has some gas in it, and will not pull from left as it should and will shut engine down if trying to run on just the left tank. What Ive done so far - Replaced fuel lines, valves and line in the tanks, new fuel pump, new vacuum line, and new filter along with new gas caps. Rerouted the left side to make the line shorter, but its not binding or getting hot or anything like that.

Is the vent in the cap plugged?

 

[Rich'sToys]

He said he replaced the caps.

 

[flying belgian]

05 Cub Cadet Commercial ZTR, 23hp Kohler Command, 2 5 gallon tanks.

Will not pump from left tank unless right has some gas in it, and will not pull from left as it should and will shut engine down if trying to run on just the left tank. What Ive done so far - Replaced fuel lines, valves and line in the tanks, new fuel pump, new vacuum line, and new filter along with new gas caps. Rerouted the left side to make the line shorter, but its not binding or getting hot or anything like that.

Could there be an airlock in the new line?

 

[504]

My old JD has vent lines on each tank, the caps are not vented. Think mud dauber.

 

[John M]

Could there be an airlock in the new line?

Doubt it, same issue with old and new lines.

 

[John M]

My old JD has vent lines on each tank, the caps are not vented. Think mud dauber.

I had thought there may be some sort of vent or return somewhere, but there isnt, just the line from each tank.

 

[DoubleO7]

Doubt it, same issue with old and new lines.

Maybe a bad or week ground if the valve that allows fuel to move from left tank is electric ?

 

[DaveBN]

What powers the fuel pump? Is it electric or vacuum operated? Maybe the pump isn't being energized properly.
Dave

 

[Blackhole49]

No where near apples to apples, but my JD 1145 with dual tanks would run out of fuel (diesel) on both tanks after about 20 minutes. This is what I found on the end of the suction lines in both and my fix. Fix has been working for 3 years.

 

[DoubleO7]

No where near apples to apples, but my JD 1145 with dual tanks would run out of fuel (diesel) on both tanks after about 20 minutes. This is what I found on the end of the suction lines in both and my fix. Fix has been working for 3 years.View attachment 80292View attachment 80293View attachment 80294

Was that tank shavings or gunk or the slimy bacteria/algae ?

 

[John M]

What powers the fuel pump? Is it electric or vacuum operated? Maybe the pump isn't being energized properly.
Dave

Vacuum.

 

[Eric in IL]

05 Cub Cadet Commercial ZTR, 23hp Kohler Command, 2 5 gallon tanks.

Will not pump from left tank unless right has some gas in it, and will not pull from left as it should and will shut engine down if trying to run on just the left tank. What Ive done so far - Replaced fuel lines, valves and line in the tanks, new fuel pump, new vacuum line, and new filter along with new gas caps. Rerouted the left side to make the line shorter, but its not binding or getting hot or anything like that.

I am not familiar with Cub Cadets and am not sure what valves you replaced. If this is a line clogging issue, it will typically be at a fitting somewhere in the line. Any 90 degree elbow is a really good place to check into.

 

[Tgrasher]

Nothing saying your new gas cap is really venting, just for a test, switch them.

 

[Rich'sToys]

Vacuum.

My Cub Cadet with a Kawasaki engine had a defective reed valve in the engine which was not producing enough vacuum to operate the fuel pump. I posted about it in the garden tractor forum.
Not sure if that applies here, but thought I'd throw it out there.

 

[Mule Meat]

Have you checked the tank selector valve for debris?

 

[John M]

I am not familiar with Cub Cadets and am not sure what valves you replaced. If this is a line clogging issue, it will typically be at a fitting somewhere in the line. Any 90 degree elbow is a really good place to check into.

Valve on each tank.

 

[John M]

Have you checked the tank selector valve for debris?

New valves, one on eachtank, but yes they are clean. This was happening BEFORE I did anything to it as well.

 

[John M]

Nothing saying your new gas cap is really venting, just for a test, switch them.

Does it even with the cap off.

 

[John M]

My Cub Cadet with a Kawasaki engine had a defective reed valve in the engine which was not producing enough vacuum to operate the fuel pump. I posted about it in the garden tractor forum.
Not sure if that applies here, but thought I'd throw it out there.

Ive actually been leaning that way.