GM Fuel Pump control scheme

[WEG1192 at aol.com]

In a message dated 01/29/2001 3:30:23 PM Eastern Standard Time, 
ludis at cruzers.com writes:

<< One problem with your theory - the fuel pump relay is controlled 100% of
 the time by the limp home circuit.  The CPU (and PROM) need to do
 nothing to operate the fuel pump relay.  In fact, they can't control the 
relay.
 
 When initially powered up, the limp home circuit turns on the relay
 briefly, and again whenever there is a distributor reference pulse. >>

Hmmm, this certainly blows a major hole in my theory. So the question 
remains, exactly what is the OP switch for? If it were in series, I could 
understand it as a safety from locking your engine, but in parallel, I for 
one don't see the need for it. JW
----------------------------------------------------------------------------
To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org