I have a 1981 300 sd, 150,000 miles. The problem is that I went on a trip thanksgiving and on the way back, It was also alot colder outside than normal as I live in phoenix, The car just sort of died while i running about 60. I pumped the pedal and in a few moments it started running again. Well in about 15 min. the same thing happened except it did not start running again. All I had was a flashlight and I came to the conclusion that the in-line filter only had a little fuel in it. I have a newer primer pump on the car, it is black and you push it to use it. It would not pump any fuel. I took the gas cap off and i ciuld here presure relieving. Then i pumped the pump again and it worked with the cap off.? Anyone know what the problem may be? 1. Is it normal for there to be presure in the fuel tank? 2. Is the primer pump also the fuel pump? #. Would a dirty gas tank screen do this? Thanks for any info.

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1981 300 sd 148000 miles