Hondata

So, I went with the idea that it was an electrical issue.

Went through the major grounding points for the car and found that my battery ground had rusted over. Fixed it and made sure no rust would form over it again.

% ethanol content would remain within 1-2% of the original value. However, this ...

Hondata wrote: Wed Jun 11, 2025 6:00 am If the ethanol reading changes with electrical load differences that should be your first investigation. Also the sensor should be on the fuel return line not the feed.

That was the first item I checked. I have good voltage to the sensor plug. Sensor is also after the FPR on the return line.

Spunkster wrote: Mon Jun 09, 2025 1:14 pm The pump could be cavitating

Any ideas based on these screenshots? If you suggest the pump I'll take it out and take a look at it again.

Did a datalog while driving and two while idling.

I realized that the ethanol content drops when my fans turn on or when any of my accessories are on as well (Dual nitrous bottle heaters, purge, probably fuel pump as well). I can also see the content dropped when getting off the throttle while ...

I don’t currently have a datalog showing the drop, I could do that later on today.

When you say air in the lines, do you mean from lack of fuel pressure? Fuel pressure still looks to be fine. Car was running on a smaller pump a few months ago with no issues.

Hello Everyone,

Have been chasing an issue with my build that would cause it to start leaning out. I realized a few days ago that my ethanol content reading had dropped about 30% from the usual reading. If I turn the car off and on again the reading returns to normal but drops again after some time ...