ive had problems with my compass cranking forever before starting up getting wor

How do I check the injectors for leaks? After the car has ran a while I have no problem restarting it. It only does this after it sets a while

you need a fuel pressure gauge hooked up, when you turn car off pressure should stay within about 10 psi after a few hours, if the pressure drops to zero it is definitely either going back to tank <regulator>, or the injectors are leaking.If that does happen you would have to hook into the fuel line and not the port on the fuel rail so you can shut off valve on fuel pressure gauge line to isolate problem