I have a 1995 Jeep Wrangler Sahara 4.0L
occasionally the engine will crank and want to turn over but seems like it wasn't getting enough fuel.
so I checked the fuel pressure by pressing the fuel test port while the key was in the on position.
when I do, I can hear the fuel pump turn on and I have pressure for a second then I will hear a click from the fuse box and the fuel pump will stop and I loose pressure. it doesn't try to maintain pressure while the key in on
this test was preformed during a period where it started just fine. I haven't checked it during a period where it didn't start as that seems to be a random occurrence
there may also be a relation to temperature because I first noticed that it wouldn't start in cold temperatures around or below freezing now it won't start in warm temp if it is also in direct sunlight. during a good period I don't have trouble starting even if the engine is warm after driving.
only once did I have the engine stall while I was driving this is usually a startup problem