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Originally Posted by PuntoRex
...And, what is that transparent tank on the left?
Some kind of interim tank?
The main metal tank is nearby, isn't it?
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The transparent tube worked is air-trap/accumulator, it allows the water to accumulate before entering the water pump. It was designed to be used as follows:
1) Water comes in from the main tank from the bottom and go out into the two pumps inlets.
2) The top venting port goes to the top of the main water tank but is closed-off by a simple on/off solenoid valve (the purple item).
3) When the two pumps demand water from the tube, water from the main tank will automatically refill the tube due to vacuum created by the water displacement.
4) This will continue to work in the same vain provided there are no air delivered from the main tank. It is unlikely anyway because the the float switch (black leaded item) is situated at a level of about 1/4 full. Beyond that, no more water injection - a yellow warning lamp will illuminate on the dash.
5) In the unlikely event of air being develivered, the air will go towards the top of the tube thus preventing air being drawned into the pumps.
6) When injection stops, the controller will open the simple valve for a few seconds so that air (if any) will be vented via the top port into the top of the tank. This action is immediately cancelled when main injection re-commences .
The system was designed to be completely maintenance free so the end user will only need to filled the water tank to re-start the system. If the system is used on a turboed, the "tank empty" signal can lower boost.
