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Emission Control & Fuel System?


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Hello everyone, I'm new on the forum. But I have a question with my Datsun 710. And, it's been years since I've had, and even just a week ago, I got the doubt about what this piece is and,

 

IMG_20180317_110919.jpg?dl=0

https://www.dropbox.com/s/bkfv8kq3iq7hvc2/IMG_20180317_110919.jpg?dl=0

 

if it's related to this one

 

https://www.dropbox.com/s/da8i8l1go92fyoi/IMG_20180317_110933.jpg?dl=0

 

And yes it is not much trouble. What is its name, function and diagram?

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For the first picture, it looks similar to a evaporative emission control valve used on 1970 521 trucks, and 510 from about the same time.  Does the valve have any markings on it?  Look by the three ports on the valve.

 

Hello, Daniel, thank you for your reply. The marks on the valve are:

 

https://www.dropbox.com/s/7f4de66vma66iu7/2018-03-17%2016.19.29.jpg?dl=0

 

https://www.dropbox.com/s/p48bb9ztt7v5ses/2018-03-17%2016.20.30.jpg?dl=0

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https://www.dropbox.....19.29.jpg?dl=0

J series engine?? This looks like a flow guide valve. The gas tank cap is sealed so evaporated gas fumes force their way through the flow guide valve and are stored in the engine crankcase. When the engine is started the fumes are sucked into the intake through the PCV valve. When running the vent is closed to the engine but the tank can suck filtered air in to replace the gas in the tank that is used up.

 

 

 

 

https://www.dropbox....110933.jpg?dl=0

 

If there are wires connected to this thing it's a vacuum switch. Probably for control of the BCDD

 

.


 

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The valve on the fire wall is a valve used for controlling evaporative emissions.  "A" goes to the air cleaner, on the filtered air side.  "C" goes to the crankcase, on a small pipe coming off the big pipe that goes to the PCV valve.  There is a small tank in the car, by and above the gas tank.   This tank separates gasoline vapors from liquid or condensing gasoline vapors.  The "F" port on the valve goes to this small tank.

 

Air, or gas vapors can flow down through valve, but not up.  If the gas tank builds pressure, gas vapors are forced down through the valve, from the "F" to the "C" port, into the engine crankcase.  Once there, the PCV system runs the gas vapors, along with blowby gasses into the intake manifold, and they are burned.  If the gas tank gets a vacuum, from fuel being used up, air flows down through the valve, from the "A" to the "F" [port and into the gas tank.

 

This evaporative emission just has two check balls in it to allow one way flow.  It just operates off sight pressure changes, and other than using the engine crankcase to store gas vapors, and the PCV system to get rid of the vapors, is completely independent of anything else.

 

The valve under the carburetor float bowl does not look familiar to me.

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https://www.dropbox.....19.29.jpg?dl=0

 

J series engine?? This looks like a flow guide valve. The gas tank cap is sealed so evaporated gas fumes force their way through the flow guide valve and are stored in the engine crankcase. When the engine is started the fumes are sucked into the intake through the PCV valve. When running the vent is closed to the engine but the tank can suck filtered air in to replace the gas in the tank that is used up.

 

 

 

 

https://www.dropbox....110933.jpg?dl=0

 

If there are wires connected to this thing it's a vacuum switch. Probably for control of the BCDD

 

.

 

Hi, datzenmike, thanks for your help. Yes, it's a Datsun 710, on the sides it has an emblem that says: 160J. engine 1600, model 1975.

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The "BCDD" has not wired. What is connected? It is covered with a plastic, but if it has a little vacuum.
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The valve on the fire wall is a valve used for controlling evaporative emissions.  "A" goes to the air cleaner, on the filtered air side.  "C" goes to the crankcase, on a small pipe coming off the big pipe that goes to the PCV valve.  There is a small tank in the car, by and above the gas tank.   This tank separates gasoline vapors from liquid or condensing gasoline vapors.  The "F" port on the valve goes to this small tank.

 

Air, or gas vapors can flow down through valve, but not up.  If the gas tank builds pressure, gas vapors are forced down through the valve, from the "F" to the "C" port, into the engine crankcase.  Once there, the PCV system runs the gas vapors, along with blowby gasses into the intake manifold, and they are burned.  If the gas tank gets a vacuum, from fuel being used up, air flows down through the valve, from the "A" to the "F" [port and into the gas tank.

 

This evaporative emission just has two check balls in it to allow one way flow.  It just operates off sight pressure changes, and other than using the engine crankcase to store gas vapors, and the PCV system to get rid of the vapors, is completely independent of anything else.

 

The valve under the carburetor float bowl does not look familiar to me.

 

Oh, I understand.
 
Thank you very much for your help, I will use new hoses to connect although I do not have the small tank in the car.
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