Start fault

[Andrewdimpa]

Just got my ph2 172 back from getting the gearbox replaced went to go to work and it won't start immobiliser light goes off after a few seconds engine is turning over fine but not starting its Asif there is no fuel please help me

 

[Andrewdimpa]

Just been out and checked the fuel pump that is running for a few seconds everytime I put the ignition on cleaned the crank sensor just need to wait for someone to come so I can stick the jump leads on it and see if it will start