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Fuel relay wiring

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Hello guys I have the old style fuse box in my 1982 golf gti, the one that takes torpedo fuses, well yesterday whilst down there I noticed the red/black wire ( bottom left of connector ) had a inline 20amp fuse on it this is the wire that is on the connected below the fused 16amp fuel pump.relah and I believe goes to one of the pins at the fuel pump relay, now my question is what does this wire do and secondly does it need a 20amp inline fuse when the relay it is going to already is fused by the 16amp , I'm just worried that if anything was to happen it would take out the wiring rather than the fuse or could I be wrong all help is greatly appreciated in advance thanks 20200701_202651.jpg
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