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Old 12-15-2021, 01:02 PM   #617
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Just got this from kpower.

Hey Eric,

Interesting, I really appreciate this info. This actually did happen in our car once, although we almost always had at least half a tank in the car during all of our track testing. We discussed with Haltech at the time, and they said the fuel gauge is analog and does not interact with the ECU, so our fuel level sender was probably just going bad. I ordered a new sender, but it hasn't been installed yet. We figured it was just an isolated issue.

However, your email tells us otherwise, and prompted us to dig into this more this morning. We now have learned that Haltech was wrong, and the gauge is definitely controlled by the CAN protocols in the Elite 1500, per the Subaru wiring diagrams. I put a call into Haltech today to see what needs to be done to get this software updated ASAP.

So we now know that it's a known issue, and we will work with Haltech on a resolution. Expect another update from us soon. In the meantime, just keep your fuel tank full
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Old 12-15-2021, 01:03 PM   #618
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Good to know it's going to get sorted. Hopefully it's the last bug to deal with.
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Old 12-15-2021, 02:10 PM   #619
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Any chance eliminating the fuel pump ECU is part of the problem? I don't think so, but I just wanted to throw that out there.
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Old 12-15-2021, 03:12 PM   #620
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Any chance eliminating the fuel pump ECU is part of the problem? I don't think so, but I just wanted to throw that out there.
I had thought about this as well, I wonder if @DustinS has deleted the fuel pump ECU.
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Old 12-15-2021, 06:20 PM   #621
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Mine is wired directly to the digital dash and is working. Can you try adding the fuel level gauge I’m the tune and selecting can network for wiring?
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Old 12-15-2021, 06:27 PM   #622
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I had thought about this as well, I wonder if @DustinS has deleted the fuel pump ECU.
I have not. I bypassed the fuel pump power only, left everything else plugged in as I didn't want to mess with it.
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Old 12-15-2021, 06:33 PM   #623
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Mine is wired directly to the digital dash and is working. Can you try adding the fuel level gauge I’m the tune and selecting can network for wiring?

I only saw a drop down for AVI1 or SPI1 still being available. Nothing about CAN control on anything listed.



If the AVI1 is still a possible pin, then technically I think it could be used if Haltech isn't able to patch things up.
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Old 12-15-2021, 06:40 PM   #624
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I had thought about this as well, I wonder if @DustinS has deleted the fuel pump ECU.
Looking back at the wiring diagram, the Fuel Pump ECU seems to have two wires going back to the ECU and the rest are just outputs. I'm guessing there is a signal coming in from the ECU with some basic parameter for fuel needs and then there is an output to the ECU to tell the ECU what the Fuel Pump ECU chose to output maybe for OBDII codes or feedback control or something. Best guess. Seems like bypassing the Fuel Pump ECU would do nothing except make the fuel pump operate with peak voltage all the time like Kpower says, and maybe its absence could trigger a trouble code or whatever other signal goes back to the ECU, but I doubt it interplays with the fuel level sensor.

I really don't know how the ECU, CPU and CANBUS system all interplays from the wiring diagrams, but the CPU seems to be running the Combination Meter Assembly, and the Fuel Sensor seems to run to the CPU, but the CAN Driver also seems to be involved in the process per the wiring diagram.

This video (first video) below seems to describe the same situation. He says the same thing another guy said (second video), which is that the fuel level sensor is analog, but then he says (first video) the sensor computes the value from the tachometer, so it may say 1/4 tank, but be empty. Wouldn't this imply the fuel level sensor is basically CANBUS controlled if the tach is CANBUS controlled, and if not all the time then at least when the tank gets low, right?


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Old 12-15-2021, 06:43 PM   #625
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I only saw a drop down for AVI1 or SPI1 still being available. Nothing about CAN control on anything listed.



If the AVI1 is still a possible pin, then technically I think it could be used if Haltech isn't able to patch things up.
Ah I see, but according to the email Eric posted from kpower it would need to be set like that. I wonder if Haltech can modify it idk.
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Old 12-15-2021, 07:48 PM   #626
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Any chance eliminating the fuel pump ECU is part of the problem? I don't think so, but I just wanted to throw that out there.
What exactly are you calling the fuel pump ecu?

I am just assuming but from all the evidence I think fuel level is calculated, maybe from injector flow, which probably has flags to recalibrate when fueling up.

Ecutek as an example highjacked the fuel level to show a different parameter, they said it worked but it would throw the gauge off, then would have to be reset by unhooking the battery or refueling.

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Old 12-15-2021, 07:53 PM   #627
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sorry for anyone that got confused about my video but let me shed some light into this.

The fuel level system is a hybrid system. The cluster reads the raw value (analog resistive sensor) level sensor. This lets the cluster know the rough estimate of fuel. To combat variations in the level sensing, (high G turns, going up hill, down hill, sloshing etc... ) the cluster also uses the fuel economy to determine fuel usage. this is a combination of a special engine parameter being transmitted. This goes along with the ABS to determine the fuel economy that then the cluster uses that with the combination of the analog sensor.

I already fixed this issue with my own products (translator modules), and helped "wiringspecialties" with this too. I will get in contact with both haltech and kindustries so see how i can help them fix this.

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Old 12-15-2021, 09:33 PM   #628
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What exactly are you calling the fuel pump ecu?

I am just assuming but from all the evidence I think fuel level is calculated, maybe from injector flow, which probably has flags to recalibrate when fueling up.

Ecutek as an example highjacked the fuel level to show a different parameter, they said it worked but it would throw the gauge off, then would have to be reset by unhooking the battery or refueling.
Fuel Pump ECU is the Fuel Pump ECU from the Kpower system and from the wiring diagram. It uses signals from the Engine ECU to output a 9V vs a 12V signal to the fuel pump, so when the fuel pump doesn't need to be cranked up, it isn't. Apparently, this will prolong the life of the fuel pump and reduce cabin noise.

Anyways, it is a non-issue. Seems we have the answer now.
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Last edited by Irace86.2.0; 12-15-2021 at 09:50 PM. Reason: Fixed an error
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Old 12-15-2021, 09:40 PM   #629
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Fuel Pump ECU is the Fuel Pump ECU from the Kpower system and from the wiring diagram. It uses signals from the Engine ECU to output a 9V vs a 12V signal to the fuel pump, so when the fuel pump doesn't need to be cranked up, it isn't. Apparently, this will prolong ECU life and reduce cabin noise.

Anyways, it is a non-issue. Seems we have the answer now.
you referring to the fuel pump controller?
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Old 12-15-2021, 09:42 PM   #630
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you referring to the fuel pump controller?
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