i changed my fuel filter and found a leak so i swiched the car off and then sorted the leak and now all the dash lights come on but it dont even try and start
What do you mean “doesn’t try to start”? You turn the key and no cranks? You turn the key, it cranks but won’t start?
If it cranks but won’t start, you may have installed the fuel filter backwards. Even if you did it correctly, you will have to crank it a bit to fill the lines up with fuel.
Did you remove the fuel pump relay in order to depressurize the fuel system?