HFS-6 Inconcistent Injection

[trdhilux]

Bit of an update of some work i have done.

I tested the cc/min of the installed #8 jet. It only pumped out about 260cc. The chart shows at 160psi should be near 460cc/min. This is indicating to me the pump could be failing.

I pulled the flow sensor housing apart and everything was free, blowing through the unit with my mouth i could feel the trigger impeller spinning. This is telling me the it either isnt spinning due to reduced pressure or flow in the line.

Next step will be to pull apart the pump head and check for signs of corrosion etc.

Other than that, i can only assume that the flow sensing circuit has failed.

Josh

[trdhilux]

Another update,

I have pulled apart the pump, haven't found any signs of corrosion in the pump, bearings etc look fine, spins freely by hand. The diaphragm looked really clean as well.

I am not sure of the anti surge unit on the outlet of the pump, whether it could have blockages etc. Is this unit necessary, i notice the later pumps don't have it.
Looks like ill need to wire in a pressure gauge and see what pressure is coming from the pump.

Is there a way to test the hall affect sensor on the printed circuit board?

Is there a minimum flow that the sensor will only work on. I presume that if i get 260cc a minute, that the sensor should read this, as with a smaller jet installed 260cc/min is achievable.

What pin on the gauge is the flow sensor trigger?

Regards