You might be having an issue with the check valve in the fuel pump leaking especially if it happens mostly during the first start after the truck has been sitting. To verify this you could cycle the key to the ‘run’ position and count to 3, do this twice and then try and start the engine, if it starts up fine you may have an issue with this check valve. It doesn’t mean the fuel pump is bad but in order to ‘fix’ the problem you will need to replace the pump OR you could continue to start the engine cold as suggested and not replace the pump. Here is a video with some info that might give more insight to this problem.
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