260ZRED Posted January 6, 2005 Share Posted January 6, 2005 when the key is on, Im getting 4.45 volts through to the fuel pump, but when the engine is cranking, Im getting a full 12.6 volts. (battery is a bit low) Is this normal?? Im not running the fuel modulator, and the wiring does not have proper soldered connectors yet. Engine is L28ET, 1982. Running the stock EFI and Fuel pump relays. Why woul dit not give me 12 volts when in on position?????? thanks for any help or info about this. Quote Link to comment Share on other sites More sharing options...
260ZRED Posted January 6, 2005 Author Share Posted January 6, 2005 getting 12 volts now... please delete. Quote Link to comment Share on other sites More sharing options...
blueovalz Posted January 6, 2005 Share Posted January 6, 2005 This is for my knowledge only, but don't the EFI engines use the AFM to switch the fuel pump on (used as a shut-off in case engine quits running) only in the "on" position, and then use the "start" position to turn pump on for starting only? Quote Link to comment Share on other sites More sharing options...
COZY Z COLE Posted January 7, 2005 Share Posted January 7, 2005 In the 280ZX EFI system the fuel pump relay-1 will shut off, if the alternator fails and the oil pressure drops, in the on position and shut the fuel pump off. In the "start" position with no alt. generation and no oil pressure the fuel pump relay-1 is on and the fuel pump is on. LARRY Quote Link to comment Share on other sites More sharing options...
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