Fuse number 11 IIRC is the cooling fans and it's a common problem for these to melt due to the truely rubbish setup Ford gave it, the main reason for which is the fans stay on for to long, on NON Cosworth models this is for the fuel pump/air conditioner on CARBURETTED versions only, all the relays etc you need to be looking at are behind the dash and are part of the engine loom which is unique to this model.

Ideally you need to rewire your fans, plenty of info, diagrams etc on here if you do a search.

The fuel pump suffers a similar problem where by the wiring has built resistance over time and so the pump cannot get the power it needs under load!

The relay sounds like the cooling fans as well (Is it a yellow one?)

Martin