johnseedee Posted February 25, 2010 Share Posted February 25, 2010 I have lost power to the in-tank fuel pump on my 1991 V8 carb. 130. A friend suggested that there is a safety circuit which cuts power to the fuel pump when there is a loss of oil pressure and this turns out to be correct. Disconnecting the oil pressure switch restores power to the pump, but there must be another power circuit (perhaps using a time-delay relay?) that allows power through to the power when starting the engine and before the oil pressure has built up. I have the generic wiring diagram for the V8 Defender but it only shows a direct ignition-switched feed to the fuel pump. Does anyone have a wiring diagram covering this version of the fuel pump circuit so that I can locate the problem. I have all (and I mean ALL) of the dashboard electrics exposed at the moment so I should be able to find the fault once I know which part of the "rats nest" to follow! I know that at least 1 of the relays below the fuses forms part of the circuit (the second from the left), but have now run out of ideas. Can anyone help, please? Quote Link to comment Share on other sites More sharing options...
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