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fuse

Electrical

Model: 930, Year:1979, Mileage:34,000, Type of use:Street use only
I have a problem with the fuel pump fuse getting hot and melting. The fuse does not shoot , the plastic gets hot and melts causing a bad connection. I've cleaned the area around the fuse block and both ends. Its been darkened by the excessive heat. It still gets hot after about 5 minutes of running and melts. I changed the fuel filter, cleaned the ground strap to the fender and the other ground connections attached to the ground strap.Still getting hot. Next I soldered a jumper wire for the fuel pump includiung an inline 20 amp glass fuse bypassing the block. After about 5 minutes the inline fuse blew. There was also a lot of heat in the wire and it had began to melt. Should I look at the fuel pumps or focus on the wiring? If the pumps ,which one first?

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