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I have a 1990 ford mustang GT 5.0 V8. today it started good until after school, it would fire and ignite, and then boom. it died. a couple of failed trys and it started and ran. but when i turned it off it was buzzing in the back, of the car, below my hatchback trunk thingee. it buzzed for about a minute and stopped. when the car is on it buzzes but it always stops when you turn it off. what the hell is going on?
 

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sounds like the fuel pump is going bad.
if you turn the key to the "ON" position (dont start it), you should hear a buzz for a few seconds (the fuel pump priming). if that is the buzz and location (fuel pump is inside the gas tank, which is under the floor of your hatch trunk) you are talking, then it's most likely the fuel pump starting to go out.
 

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the buzzing is possibly your fuel pump gettin loud, it could be going bad. causeing low fuel pressure and hard starting.
 
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