Posted by Bob on May 15, 2013 at 07:42:51 from (64.255.159.192):
In Reply to: Re: OT. 95 GMC posted by Determined on May 14, 2013 at 19:48:44:
"Oil pressure switch and relay controls power to fuel pump after ecm runs initial prime cycle for starting."
NO it doesn't.
Oil pressure switch PARALLELS the fuel pump relay, which is operated by the ECM when engine rotation is detected. Oil pressure switch is only a BACKUP if the relay circuit fails. Extended cranking will result 'cuz of the delay in the fuel pump being activated... only when oil pressure builds up.
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