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Blowing fuses in 99 Sierra Z71
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Question
Reyn
I have a 99 Z71 with 302k miles on it. It went dead driving down the road yesterday. Checked everything and replaced the 20A fuse next to the fuel pump relay. It was blown. I even switched the relay with another to test it.
It cranks right up but if I drive it more than a couple miles then the fuse blows again. My first thought is maybe the fuel pump is going out and drawing too much causing the blown fuse? The relay switch gets hot also. Just it though none of the others in the fuse box.
I decided to just let it idle for 20 minutes in the driveway. It never went dead. I would think if it was the fuel pump then why is it only blowing the fuse when I drive?
Opinions on what to change or test next?
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