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wires

I'm looking at a pump and the positive has a plain red wire, the negative has a red/black stripe.
If that's no help, you can check with a multi meter or even a 12V lamp against the chassis (negative) to identify which of yours is positive. You'll need assistance with someone on the ign. key, as the ecu will time out the 12V+ after about 5 seconds.
 
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