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Modern fuel injected vehicles will only run the pump for a couple of seconds to pressurize the fuel system at stat-up. The pump won't run after that until the engine is running or you are actively engaging the starter. The fuel pump and relay are doing exactly what they are supposed to do. Now, that doesn't mean the pump is building pressure like it should but the pump running for a second then shutting off after you first turn on the key is normal operation. You may have entered it, but I can see no information about what vehicle you are working on other than it is a truck. More information about the vehicle would help. In the mean time, I feel a compression check is an order and you should take a look at the oil to make sure there isn't any water mixed in. Some history would help as well, like if you have done any type of service in the last month, when the basic maintainence was done, how many miles are on it, etc.
If you dont have much money, guessing what parts to change gets expensive. First, you need to verify if it has fuel pressure and spark, that will lead you in the direction to start looking for the problem. Pull 1 spark plug wire off and see if it will jump a 1/2" gap, If so, thats good. If no spark, make sure the cam is turning, you may have a broken timingbelt.
I have a silhouette and it had the same problem
Follow the fuel pump wiring harness to where it plugs into the floor of the van--pull the connectors apart--they will probably be corroded, and you will possibly have to change both wiring harnesses or connectors.