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Old 06-07-2018, 03:37 PM   #15
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12 pin dlc in a 93 p30 Chevy chassis
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Old 06-07-2018, 03:48 PM   #16
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It's possible that the electric pump , gets it's power , through an oil pressure switch , after the ECM's short start cycle .
Check the oil pressure sending unit , if the sender has multiple wires , then there's a chance that one is ignition input and another should feed 12 volt power to the pump when there is oil pressure.
Chrysler used that system on early TBI systems, to shut off fuel flow if the engine stalled.
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Old 06-07-2018, 03:59 PM   #17
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Quote:
Originally Posted by Skip426 View Post
It's possible that the electric pump , gets it's power , through an oil pressure switch , after the ECM's short start cycle .
Check the oil pressure sending unit , if the sender has multiple wires , then there's a chance that one is ignition input and another should feed 12 volt power to the pump when there is oil pressure.
Chrysler used that system on early TBI systems, to shut off fuel flow if the engine stalled.
Chevy/GMC used the oil pressure sensor after initial pressurization of the fuel system in '90, '96, and '97 that I know from personal experience, so it's likely you're correct.
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