Cant open my trunk

does the trunk open with remote button? If so you have a problem with the lock cylinder, if not it sounds like you trunk latch is not working, and the trunk deck leveler is in the up position. be sure all your fuses are good. If they are you may need to remove rear seat and go into truck that way unbolt the latch from the trunk deck to open then repair or replace as needed. Problem with the gas gauge sounds like the sending unit was bent or in a bind, when installed. you will need to remove it from the tank again to find the problem.