Water injection installed, not much cooling occurring...

[lockwood77]

Water tank is a UK-spec rear washer bottle, so yeah, small hole in the cap that I\'ve checked is allowing air through. Good thinking though!

[Archbish]

is the pump at a place where it can get enough water to pump through?  I understand that either having a lift pump, or ensuring the high pressure pump is at the right height (whatever that may be) is crucial to ensure the water is being fed through...

[lockwood77]

Yeah, I know what you mean, I wanted the pump below the tank but actually it is kind of parallel, i.e. the intake of the pump is slightly higher than the bottom of the tank where the pipe is.

However, I have seen other people with this install working fine and the instructions say that whilst it is preferable, it is not vital and the pump should still work.

The thing that\'s really throwing me is that it seems to work fine when you\'re running water through the system in "test" mode (i.e. pipe off the injector, engine not running), but when you\'re asking it to squirt into the intake pipe, it stops working after a short while with air in the checkvale. :confused:

[Archbish]

is the pipe higher than the injector?  If it\'s under pressure, it shouldn\'t be an issue, but I suppose if the injector was open longer than the water was under pressure, then that could have an issue...  How does this system work - is it a closed loop with a regulator at the end and a T off to the injector, or a single pipe from the pump to the injector?

[lockwood77]

Hmm, I think the injector is slightly higher than the pipe run, there\'s not much in it though. The system is a simple straight line really:

Tank > Pump > Checkvalve > Clog detector (microswitch over a pressure valve or similar device I think) > Injector

You then have a relay wired into the pump power, clog detector switch (which also powers the LED in the dash to show it\'s working) and of course a boost switch, which is adjustable and causes the whole thing to fire up when the desired boost is reached.

The tank, pump and checkvale are in the back, with a run of pipe down through the passenger footwell and up into the engine bay, where it runs through the clog detector and into the injector in the intake pipe.

[FD3UK]

Have you tried running without the check valve?  I have run mine without for over a year without any problems, even with pump above tank.

[lockwood77]

Hmm, I think that\'s my next attempt, I would have done that the other day but I need to get something to replace it as a connector! Something with (I think) 1/8NPT threads either side should do the trick.

I\'m not sure how the checkvalve works - I\'d assumed it\'s there to maintain water pressure on the injector side of the system, so that as soon as the pump operates it\'s injecting water (i.e. the water in the system doesn\'t run "back").

[Nik da Greek]

Is it worth ringing the company who supplied/made it? Sounds like they ought to be doing a bit of product support here and offering a bit of advice. For all you know it\'s a really common problem with the injectors or whatever, and they replace a hundred of them a week for this fault. You may be looking for a problem with your set-up that simply isn\'t there

[lockwood77]

Yeah, an email to Cooling Mist is on its way!

[FD3UK]

Just had a look at Coolingmist website. At first I thought check valve was between tank and pump, but I see it is used to keep line pressure between pump and injector. You will need to keep that in place, it maybe faulty or wrong way round!!

[lockwood77]

Definitely the right way round (according to the arrows on it anyway!)

[lockwood77]

Well, the official Cooling Mist line is that the pump is gravity fed and needs to be below the tank so that the checkvalve can prime.

I\'m a bit confused by this as the checkvalve is AFTER the pump, but maybe that doesn\'t matter. I\'m more confused by the people who have mounted their pump above the tank with no apparent problems (I appreciate not all of these are the same kit, but I\'m sure I\'ve seen a Cooling Mist one recently with the exact same setup I have!)

[Nik da Greek]

Sounds a bit like it may be their stock/hopeful answer then. A bit like ringing for computer support and the always say to just restart the computer! Is their pump so rubbish that it can\'t lift water out of the tank without being gravity assisted, then? Be better off going to a fishpond pump specialist if that\'s the case! Or use a windscreen washer pump for five quid from a breakers, I\'m assuming we\'re not talking about fire hose amounts of water being moved around here?

[lockwood77]

Yeah, seems strange to me - I don\'t know much about hydraulics, but surely once water has been pumped through and is sitting in the pipes, it doesn\'t matter where everything sits as unless you run out of water, there\'s no air in the system and the gravity of water in the tank will keep the pipe full as the pump draws it through?

It\'s a pretty beefy pump, presumably at 150psi as that\'s the name of the kit, so you\'d have thought it would work OK.

[FD3UK]

Try fitting a one way valve (windscreen washer type from halfrauds will do) between the tank and the pump. This will keep water in the line between oneway valve through pump to check valve, thus keeping pump primed.