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Fuses blow because of excessive current or excessive heat. The most likely cause is either a defective fuel pump or a pinched or damaged wiring harness causing a short circuit. It is also possible that one of the controls in the fuel pump circuit is defective. Not too likely, but it is also possible that the fuse terminals are corroded, causing heat to build up at the fuse, blowing it. There are too many possible causes to adequately describe them here. You need to go through the diagnostic procedure step by step to isolate the problem. If you don't know how to do this, then you need to engage the services of a competent mechanic.
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