Another way to test that theory is to try and bleed the pressure out right when you shut it off, let it sit for 20 minutes, then try to start to see if it makes a difference.

88 Raider- sitting on a full size Chevy frame with 35.5x11.50x16 Dyna Torque II tractors
89 Montero- stock 2.6 M/T 30-9.50 BFG all terrains on American Racing Wheels
99 2500 Ram- 285-75-16 Uniroyal all terrains,straight pipes with no cat (yes its loud)