I have a '93 XJ 4.0 that's been taking longer to start for about the past two weeks. Did a tune up including fuel filter, have good voltage and cranks strong. Heres my question...Before turning the key I have zero pressure. Turn the key and have 5 lbs, start it and I have 35 lbs, turn it off and I have zero. No apparent fuel leaks anywhere so I thought maybe a leaking injector so I replaced them. Runs better but still the same pressure results Next thought would be weak pump or leak in the in tank fuel hose maybe? Am I on the right track? With such low pressure before starting, why would pressure be fine after? After it starts it runs great... WTH?