Originally Posted by
filmy
When you turn the key on from a cold-start, the fuel pump starts up, which pressurizes the fuel in the lines and in the filter. The fuel filter is underneath the car, on the left side, somewhere in the area next to your transmission and against the frame rail. I would say that the fuel system being pressurized is buzzing something that's loose with your fuel filter or filter cover. This makes sense because the fuel system may be dropping pressure in the lines/filter from sitting awhile and then turning the key on begins the pressurizing function - but only after sitting awhile. Check your fuel filter and cover.
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