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Unread 03-07-2014, 21:02
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Ether Ether is offline
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Re: Ford auto mechanic?

Quote:
Originally Posted by DonRotolo View Post
The Prime function (2-second run you hear before crank) bypasses the fuel pump relay.
Are you sure of this?

I just ran a test:

key OFF: Pin87 reads zero volts

key ON: Pin87 reads 12 volts for 2 seconds while I hear fuel pump running, then goes back to zero when pump stops.

turn key to START: engine starts, Pin87 reads 14 volts, stays there. I turn key off when engine starts misfiring.


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