CarNut said:
Sorry, but I couldn't resist following up on this. When I called the extended crank after start an undocumented quirk in another post
http://www.redlineforums.com/forums/35297-post17.html you claimed the pump was always on when cranking and nothing was "undocumented". I don't think you'll find that in the owners manual.
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Sorry Nut, You may have misinterpreted what I was saying in the other thread. What I was getting at was that this behavior is not some sort of "software quirk" in the Redline. The Redline fuel pump doesnt really work any differently than any other GM has for a great many years.It stems from a SAFETY FEATURE that automatically shuts off the fuel pump when the ECM/PCM "sees" the engine stop running.
So you see the pump IS always ON when you are cranking.But if it hasnt seen an OFF to ON transition, there will be NO 3-second "prime pulse" (unlike when you go to start you car from and IGN OFF state) therefore the pump isnt already running when you start to crank-
UNDER THESE CONDITIONS THE FUEL PUMP WONT START RUNNING UNTIL IT "SEES" A CRANK INPUT FROM THE BCM
AND THE ENGINE RPM SIGNAL FROM THE IGNITION
So if you STALL it and just start cranking after a stall- there can be a short delay before proper fuel pressure will exist in the fuel rail. Like I said, this isnt a real departure from the way ALL GM products have worked for a great many years, and it's operation is well documented in the various FSM resources.
The owners manuals is merely a simplified guide for owners operating the car, hence it has no need to get into the intricate details of system function.
There are other resources for that, for those so inclined...
WopOnTour