I need some help with a 1994 XJ6. Its hard to start, once it starts it runs fine. I've checked just about every sensor, the vacuum is good, 17psi. It seems that after sitting the fuel manifold has no fuel to start. Any help would be appreciated

 

Just an update on the starting problems. With the fuel tank full the jag starts easily. As the fuel level goes down it gets harder and harder. The car sat for 5 days with a full tank and start easily. Any help would be appreciated