Another Mopar Off My Bucket List - Barracuda Fastback

Well... crap! I took the Roadrunner for a spin today. It started out running perfect when I went to the parts store. I had a few other errands to run around town and it continued to behave. All of the gauges are working along with every other electrical/mechanical function. When I decided to take the car out of town things changed.

The first few miles were great. - But then the problem from the other day came back. It started to act as though I was running out of fuel. There are no error codes that show up on the FAST interface.

Fuel pressure wasn't as steady as the other day. It varied between 34 and 43 psi. According to FAST it's acceptable if it's between 20 and 60 psi so I still don't think there's an issue with the pump or regulator.

We're using an Optima battery that has top post and side terminals on it. When we wired up the FAST system one of the major goals was to isolate the power connections for the fuel injection. We chose to feed power from the starter relay to the rest of the car's accessories and connected the FAST to the top posts. It never occurred to us to connect the FAST to those side terminals. I don't know if it would make a difference but I am going to re-route to them.

It's likely that there is a lot more information online about this 2.0 system now than when we did the initial installation. I guess I'll be spending the next few days searching for clues on further troubleshooting.