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Old 04-01-2007, 03:05 PM   #1
flathead3702
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Default 93 SC2 fuel pump wiring

Fuel pump not running. 4 wires to fuel pump. Black to purple 7.1 volts when key is on. Black with white stripe to gray 11.9 volts for a second when key is turned on then drops to zero. Which of these sets of wires goes to pump, which set goes to gauge? Should I have 12 volts to fuel pump all the time when key is on?

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Old 04-01-2007, 04:01 PM   #2
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2003 L-Series 3.0L Sedan
Default Re: 93 SC2 fuel pump wiring

In general no, there won't be 12v at the pump IF the ignition key is left ON past the few seconds before turning to START. The only time there is 12v on the pump is whenever the engine is turning, courtesy of the safety feature through the CPS. Most won't notice the absence of the fuel pump when starting normally. Its when the ignition key is left in the ON position that some may hear the fuel pump for a few seconds then silence. This is just a timed safety event to prime the lines with pressure and then turn off if the key isn't turned after a few seconds. The fuel pump will immediately come back on as long as the crank position sensor detects engine rotation. So the way to check for the pump and power up is to listen for the pump whine and/or hook up a fuel pressure gauge to the fuel rail schrader valve. The pressure gauge should immediately register fuel pressure when the ignition key is turned to ON.

If there is absolutely no sound of a pump in the ON position (in the first few seconds) then the normal checks are the fuel pump fuse and then the relay.

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Old 04-04-2007, 12:15 PM   #3
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Default Re: 93 SC2 fuel pump wiring

Thanks for the information. I have checked the fuses and relay, seem to be ok. I figure my fuel pump has gone bad, just trying to eleminate all possibilities before I replace it.

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Old 04-04-2007, 05:46 PM   #4
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2003 L-Series 3.0L Sedan
Default Re: 93 SC2 fuel pump wiring

A '93 with the original fuel filter may be clogged and something to consider also when determining if the fuel pump is dead. Have you tried depressing the fuel rail valve when the ignition key is left in the ON position? If the pump is working there should be a healthy spray of fuel. Cover the valve with a rag to contain the overspray just in case. If there isn't any fuel spraying out or a dribble then either the pump is not powered up, fuel filter is plugged, fuel pressure regulator failed, or a failed pump. Try substituting the fuel pump relay with a similar relay in the fuse box. The key to isolating a pump is to listen for the sound of the pump right when the ignition key is first turned to the ON position. Hope this helps.

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