Car ran fine before the tow. just picked it up off my sister in law. After about a 45 min tow it wont start. i replaced the cps and it started up fine for about 5 mins then shut off. Fuel pump doesnt sound like its turning on. Car sat for about 6 months with 3/4 tank of gas. could be waterdown gas or clogged fuel filter. Any ideas to test this by yourself?