Old gas in fuel pump

[Jack Guzman]

My 51 chevy pickup sat for a long time before I got it.The carburetor had dust in the bowl. The gas tank contained a little red liquid that smelled kind of like gas,but was probably concentrated dye with only traces of gas left unevaporated.
I rebuilt the carb and cleaned up the tank inside. I didn't touch the fuel pump because it was full.When I cracked the line there was still some pressure built up in it. I blew out all the fuel lines and now I'm having second thoughts about the fuel pump.
Would that gas under pressure remain stable or would it break down into something that would clog or damage the pump? I'm debating whether or not to rebuild the pump.
Anyone have any info for me that could help in my decision?---Thanks---Jack