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I still maintain that I had no fuel smell in the engine bay but remember this is the Internet and I could be a complete idiot. I decided to go all the way again, this time pulling the fuel rail off for funsies. The o-ring on injector number three has a funky shape to it, I’d say it’s more ovular...

That's my thought as well, I've even thrown a few microfibers around the fuel rail to see if they pick up any fuel scent but nada. I have an entire spare HPFP housing, I guess it wouldn't hurt to throw the OEM internals into that and see what happens. Tornado watch all night tonight and the...

Bezos delivered my cable today, here's a couple of data logs. These are from simply trotting down the street and back so very light throttle. On my APv1 I can only monitor one thing at a time so it's nice to finally be able to see all of the data together. Nothing really sticks out like a sore...

So I did indeed just skip around the neighborhood with my phone tucked in between the ECU and the battery… the hpfp makes happy tractor noises the entire time, even when the fuel pressure drops. So the hpfp seems to at least not be completely losing signal according to my redneck math. I guess I...

I just went through and chased the hpfp connection as far as I could and didn’t see any breaks or damage to it. I put some dielectric grease on the connector and zip tied it to the spill valve, right after pulling out of the driveway the fuel pressure dipped down to 58 psi. I still have no...

The needle seems to move in and out freely, no hesitation. Again it’s just odd to me that I had no problems until I swapped the injectors. it really makes me think it’s something I did but the fuel pressure dropping to tank pressure points to the hpfp.

I had considered testing the PRV but I don’t really want to drive the car around long enough to get up to 220 and I’m not sure it’d get there idling. To be cautious I did order an OEM one on Monday, still waiting on it to ship out. I also ordered a fuel pressure sensor and the HPFP line O-rings...

Year/Make/Model: 2008 Mazdaspeed3 Mileage: 108k Location: WI Concern: Fuel pressure drops to in-tank pump pressure while driving DTC's: None Modifications: Autotech HPFP internals ECU/Tuning Software: Accessport V1 (used only for datalogging when in need) Tuner: Stock Is the concern...