Pump priming?
 

I have the HFS4 kit and and today i was idling for awhile then turned the car off then back on and the pump randomly turned on and stayed on. No flow showed up on the gauge and the low level light blinked for a second then went away. I turned the car off and then back on again and it didnt do it again. I also noticed that when i turn the car on the pump turns on for a split second then off. It does the same thing when i am turning the car off also. Is this pump failure? Also if i turn the key just right and hold it there i can get the pump to stay on. But now flow comes out of the nozzle.

Re: Pump priming?
 

Did the "threshold" led came on when this happened? Is it a DI engine?

Re: Pump priming?
 

This is a DI engine. Mazdaspeed 3 to be exact. Im not sure if the thres light came on or not i didnt check. I did just go to the car and put the key in position 2 and wait for the gauge to show it was ready then i went slowly down to position 1 and the green F-IDC light came on for a split second and turned off. No thres light came on at anytime. Also the pump came on as well but no flow from the nozzle. The F-IDC light turns off no matter what but the pump i can get to stay on if i hold the key just right coming from position 2 to position 1.

Re: Pump priming?
 

I am not familiar with the key positions, please explain to me:

Can I assume...
key position 0 = radio off and engine off
key position 1 = radio on and engine off
key position 2 = pre-crank and engine run
key position 3 (biased) = pre-crank

Re: Pump priming?
 

ill try to explain.
key position 0 = engine off radio off/ just put key
key position 1 = radio on engine off/ key console says "ACC"
key position 2 = pre-crank engine not running/ key console says "on"
key poistion 3 = engine running

Going from position 1 to 2 turns the gauge on. Going to position 2 to 3 starts the car.

Re: Pump priming?
 

Great to have to modes clarified.

So recap:

- p1 to p2 .... system works as designed

- p2 to p1 ...... system behaves strangely such as the pump stays on if you hold the key. At no time the threshold led is on?

I asked this because the pump is enabled only when the threshold led is triggered. Please confirm this again.

Re: Pump priming?
 

That is correct. When i turn my key from p2 to p1 right in the middle of this turn *between p2 and p1* the pump will turn on for a split second. If i hold the key in this position the pump stays on. At no point did the thres light illuminate. I should also note that i get that thump sound as well from the pump i believe. But i was told that the sound is normal if the controller and pump are wired into different power sources. I wonder if its possible my controller is turning off but the pump isn't.

Re: Pump priming?
 

Lets see if we can isolate the source of problem.
Unplug the green harness, assuming you are using the di input. Let me know if p2-> p1 problem still exists?

Re: Pump priming?
 

I tried unplugging the green wire and the problem is still there. Then i plugged the green wire back in and tried unplugging the blue wire and the problem went away.

Both test done multiple times and it went like this. With car complete off no key in the ignition. I unplugged the green wire turned the key the p2 and waited for the gauge to show it was ready then went down to p1. Then repeated same steps for the blue wire.

Re: Pump priming?
 

One less thing to be concerned with.

Lets delve deeper...

Please check the voltage on test pin 5 against ground on key positions 0,1,2,3.