It could be anything. Normally I would have a more direct answer, but being an installer that commonly fixed botched remote start installs, I know how a bad install can damage just about everything electrical in the car. I would start by having the installer of the system and then a mechanic certified in 12volt circuits look at the car. If your installer used a "Add a Fuse" circuit or something similar, or wrapped a wire around a fuse or relay, or if they tapped into the wrong wire... you can get problems. 3 years ago? When did you have the remote starter installed? Was it just before you started having problems? Something is causing a fueling problem and I bet it has to do with that install. Good luck!