Just swapped over to a 51R in my '07 fit. Now the car wonk crank. Tried putting the original battery back in and still nothing. Car is turning over but just not starting. Tried giving it gas at full throttle, then half throttle, still nothing. Tried jumping it off, still nothing. Tested the new battery and it was fine. Checked all fuses, they are good. Any other suggestions?

 

To be clear, is the starter engaging and turning the engine over or not? If so, can you hear the fuel pump working for a few seconds when you turn the ignition switch on (prior to turning it to the start position)? I assume there's a relay for the fuel pump, but I'm not sure where it is off-hand.