When I turn the key to the On position without starting the truck I get a faint squeal noise around the fuel tank area which I assume is the fuel pump priming. I zipped a audio file of the sound and attached it to this thread.
2007 - 5.4 - 81,000 miles, fuel filter has been changed few months ago and FPDM replaced 3 days ago. It has a intermittant slight fast shake at idle. Some days the VCT will make rattling noises after the engine is warm. Today after work tried starting the truck and it wouldn't start on first crank and the low oil pressure light would come on but the second try it would start and oil pressure would be normal. Thinking the fuel pump might be on the brink?