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  #1  
Old 12-06-2015, 01:03 AM
trdhilux trdhilux is offline
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Default HFS-6 Inconcistent Injection

Hi everyone,

I have recently purchased a Hilux with a 3.4 TRD supercharged motor. The motor is setup quite nice, with some headwork, pulley geared for about 9 psi, seventh injector added, and exhaust. It is also running a HFS-6 system. I am very new to the water injection world, and want to learn as much about these units as I can. From what I understand the HFS-6 is known to have a few issues.

I have a few questions in regards to my setup, and hopefully you guys can help me out.

- First question is, on the display gauge, 90% of the time I can only get the unit to flow 2 bars, no matter what the boost or engine load conditions are. Occasionally I will see the flow bar going higher, and indicating it is actually flowing more.
- Second question is I beleive the unit is injecting too early, even when highway cruising, most of the time the blue LED, at the end of the bar graph is flickering (not sure what that LED represents) and will flow one or two bar on maybe 2-3 psi.
-Third question is, after I leave the car overnight, when I start I can hear what I beleive is the pump has possibly lost prime. I can hear quite a growl coming from the car, but havent been able to pinpoint it to the pump. The fluid tank is above th epump, so should gravity to the pump. Are there any issues with the pump from the HFS-6 losing prime? The pump has an accumulator (I think they are called) on it, which I beleive the later models dont have.

I would also like to re-do jet size calculations etc to confirm that I have the right jet etc, but I can work on that later.

Thanks, Josh
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  #2  
Old 17-06-2015, 10:50 AM
Richard L Richard L is offline
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Default Re: HFS-6 Inconcistent Injection

Hello Josh,

HFS6 is the most complex and versatile system we have ever produced, issue is normally associate with the operator not familiar with the system. Quality of the install is great affected by the longer term reliability of the system. It was superseded by the current HFS3 and 4 in 2012.

First of all, how old is the system? A newly installed system should not exhibit those abnormal behaviour.

First thing to do is to purged the system and check for corrosion of the wires. If the pump is installed in the engine bay, you will have no end of problems as it is not suppose to be. There are more experience users here on the HFS6 that may chime in and help. I can only help you with the initial problem and not effective on a six years old install.

You first call for support is from your supplier.
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  #3  
Old 18-06-2015, 01:48 AM
trdhilux trdhilux is offline
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Default Re: HFS-6 Inconcistent Injection

Hi Richard thanks for the reply!

I would imagine the system to be around 3-4 years old.

The pump is currently installed on the underside of the car, under the tub. I do not like it there and am planning on installing the pump, wiring and a reservoir in a small weather proof tool box in the back of the ute.

Yes I have been in contact with the supplier and installer a while ago, so I will find out some more details from them as well.

I think in the long run I would like to upgrade to a HSF3, but can't afford that cost right now. I presume that nothing would be interchangeable with the HFS6.

I will research into purging the system, and go from there.

Josh
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  #4  
Old 18-06-2015, 11:23 AM
Richard L Richard L is offline
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Default Re: HFS-6 Inconcistent Injection

The pump is not water proof, in time it will fail as the bearing are corroded. You might like to replace the pump and relocate it to a dry place.
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Old 18-06-2015, 10:26 PM
trdhilux trdhilux is offline
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Default Re: HFS-6 Inconcistent Injection

OK thanks for that, its is possible that it is on its way out now.

i found some details on the kit, it was the owner of the car who purchased it, and had a mechanic install it (performance shop) but I don't know if they have had a lot to do these type of sytems (ie they advertise the fact they install them etc).

Will a newer model pump replace the pump I have now?
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  #6  
Old 19-06-2015, 03:13 AM
trdhilux trdhilux is offline
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Default Re: HFS-6 Inconcistent Injection

My current thoughts at the moment are to purchase a new pump, and an aquamist baffled water meth tank, and install in a dry protected area. Whilst I'm at it install an inline filter and jet with checkvalve as the jet is currently located on the supercharger intake, with no check valve.

I would also like to look at the option of changing jet size and running just water through the system, along with dropping a few psi (stock pulley) form the supercharger.

Josh
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  #7  
Old 31-10-2017, 09:43 AM
Richard L Richard L is offline
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Default Re: HFS-6 Inconcistent Injection

intermittent could be caused by internal corrosion of the FCM. Post a picture of the inside.
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  #8  
Old 31-10-2017, 10:58 AM
trdhilux trdhilux is offline
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Default Re: HFS-6 Inconcistent Injection

Thanks for the quick reply, how do I access inside of fcm? It has foam on the mounting surface,to reduce vibration I suppose, are there screws there to gain access?

Thanks
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  #9  
Old 31-10-2017, 06:14 PM
Richard L Richard L is offline
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Default Re: HFS-6 Inconcistent Injection

four screws
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  #10  
Old 01-11-2017, 11:49 AM
trdhilux trdhilux is offline
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Default Re: HFS-6 Inconcistent Injection

Photos from inside, tested again after reassembly and have a maximum of two bars reading for no more than two seconds under TST mode with jet spraying into bottle. Sorry if photos are too big doing this from my phone





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