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OK .. I'm having problems with my 87 F-150 ( A.K.A. Mustang tow vehicle ). It seems my fuel pumps are not working , it has 3 of them. Well I started with the high pressure pump , took the leads off and I get 12 volts to the pump after jumping the relay to make the pump run constant. When I plug the pump in voltage goes to zero. Ah ha I thought , bad pump , well I got a new pump and it does the same thing. So my question is , if I had a short in the system I would not get twelve volts to pump at all, right? It seems to me that I might have an open circuit in the harness somewhere and the pump draws too much juice so the voltage goes to zero. Seems logical right? IF I remove the relay and run a hot lead from the battery to the OUT side of the relay plug the pump works fine. If I run a wire from the hot IN side of the relay plug I get the same problem , 12 volts to the pump until I plug it in. Anyone have any ideas , this is driving me nuts.
70 SCJ R-CODE MACH 1
88 GT
70 SCJ R-CODE MACH 1
88 GT