redsupraman82 Posted October 6, 2011 Share Posted October 6, 2011 ok guys as some of you know i have been having a fuel pump issue after doing my N/A to TT swap! i am trying to get it to someone but having trailer issues at the mo so while im waiting i been poking about! i read somewhere that if you jump a wire from the FP diog port to the positive on the battery it will run, so i tried that and i can clearly hear fuel getting to the engine (obviously i did not leave it on there, just as a test!) but when i try a jump between the B and FP on the diog port nothing happens, am i getting closer of a lot further away!! any input would be helpful! Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted October 6, 2011 Share Posted October 6, 2011 Well, is the B terminal showing battery positive with the ignition on? If not you need to trace it back to wherever it gets its feed from and see what's up. Does it run with the FP to battery positive, as in start up? Quote Link to comment Share on other sites More sharing options...
jagman Posted October 6, 2011 Share Posted October 6, 2011 Without the diagram , off memory : circuit is : 12v EFI 2 fuse to EFI 2 relay - then to Fuel pump ECU - B pin the output FP is switched 9/12 v to the pump . The ECU controls the Fuel ECU via 2 wires to it and one other wire remains - earth (this is common to the fuel pump earth) However the EFI2 relay is switched on to provide power to the fuel pump ECU by another ECU B wire ie from the ECU - no B power at the diag port could mean no B power from the ECU , so no fuel ECU power! I cannot remember the routing of the B line sorry . Check from the fuel ecu in the boot for power at the connector Quote Link to comment Share on other sites More sharing options...
redsupraman82 Posted October 7, 2011 Author Share Posted October 7, 2011 thats the thing! i dont have a EFI 2 relay as im using the N/A fusebox how do i get round this! Quote Link to comment Share on other sites More sharing options...
jagman Posted October 7, 2011 Share Posted October 7, 2011 I've never seen the NA diagrams , but there will be a sort of EFI relay , to shut the pump off in case of accident , you don't pump fuel if your car is on fire ! If you can post up a diagram , it would help lots Quote Link to comment Share on other sites More sharing options...
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