I purchased a tailgating truck a month ago 98 Dodge Ram 4x4 with about 120,000 miles. Nothing special just something to tailgate with, ran pretty well when I first bought it. Replaced the brakes and rotors. Then after the test drive after I finished the brake project. I went to back the truck into the garage. I then stopped and turned the truck off so I could clean out the garage. I then came back to the truck about 10 minutes later and the truck wouldn't fire up. I went into the house tended to some business and came back out about 15 minutes later and she fired up. I backed the truck into the garage and has not started for a while. I have replaced the battery and no luck. It just wouldn't fire up. So today I went and checked spark. I have a spark. Checked for fuel pressure got nothing. So I had the wife pump the gas about 8 times. I then came back out about 15 mins later and she fired right up. Any ideas as to why its an inconsistent start? I do want to note that after it started I went back shut it off and re-checked the fuel pressure and it's about 4.5. any ideas would be appreciated!
Anyone who can help me with a diagnoses is welcome to my tailgate anytime. Thanks in advance!