Lately I've been having trouble with my mustang not starting after heavy rain which sometimes leads to flooding. The engine is turning, but does not catch and start. Leading up to this when I sometimes had to go through puddles I couldn't avoid, say an inch of water, the engine would start to lose power about 2 or 3 minutes later. It would sometimes even slow me down to a crawl. If I had to turn off the engine shortly after, before I had run it long enough to "burn the water off" I suppose, the car would not start again. Currently it is refusing to start and parked in the street right where the rain runs off, and we've had a lot of rain recently. Is it the fuel system? Do I just need to replace the fuel filter?
Added (1). Previously when I had this problem in the car, I would pump the gas pedal and it would eventually catch and start. I know this vehicle is fuel injected, but pumping the gas worked up until recently. Now nothing seems to get it to catch. That's why I initially thought it was a fuel problem.