Code 1074, 1075 reading in 2007 Mustang Gt
gas tank won't fill up stops at 1/2 tank any advice.

 

Double check those codes. Did you mean p0175 and p0174?
Look up s197 gas tank TSB 07-21-12

 

P0174 was the code

 

lean code. You have a intake leak or exhaust leak. Exhaust leaks are easy, you sound like a machine gun when idling or revving the engine. Intake leaks are harder to trace. You'll need to start with the intake tube to the throttle body and check to see everything is tight...and/or do a smoke test to see if any leaks are apparent.