Fuses blow for two reasons -- short or ground. The wiring diagram for '80 - '85 is in the Bentley and is good enough for your purposes. You may find some wiring colors different. Look for grounds. Remove faucet and bench test for short or ground and proper operation of switch. If not there, then check pump. But look at the wiring diagram. Power is live to the pump and then controlled by the faucet switch grounding the circuit and completing when pump is turned 'on'. You can disconnect from the faucet switch and artificially ground at the T2 connection to see if it is the pump or after (faucet switch).