[s-cars] fuel pump switch

chris chambers fastscirocco_2000 at yahoo.com
Sun Jan 1 22:05:49 EST 2006


if you are going to do this, why not install a relay like
the older cars to automaticly cycle the pump each time you turn the key

--- Jerry Scott <jerryscott at wispertel.net> wrote:

> Dave
> Thanks for the information and advice, but I still think that I will 
> install a hot switch. I would locate it up inside the knee panel and 
> have it operate as a press and hold to activate the pump.  That way
> it 
> cannot be left on.  I have had other cars that activate the pump when
> the key is turned on, so I know that it used to be done before the 
> safety issues came up.  My cold weather starting problem was cured
> when 
> I ran a can of B&G 44K through the tank, indicating that the check
> valve 
> was probably ok but just "gummed up" with our Winter alcohol blended 
> fuel.  I just want to have a back up plan, if this should occur
> again.  
> A friend of mine just had this same thing happen in his new Subaru 
> wagon, after the car sat for 2 weeks at the airport, in our sub-zero 
> temperatures.  He had to get a jump before the car would start, since
> no 
> fuel got to the rail before the battery ran down. So, in view of my 
> intent, does anyone have a location for a "key on" hot terminal
> inside 
> the knee panel?
> Jerry
> Dave Forgie wrote:
> >Jerry: It would be possible but I would NOT advise it. Under the
> existing protocols, the ECU triggers the main fuel pump relay (under
> the drivers side knee bolster on North American UrS cars) ONLY after
> the ECU has received a signal from the cam position sensor (or crank
> sensor) that the engine is going around, i.e. being started.  The
> good thing about this is IF you are in an accident that stops the
> engine, the ECU shuts off the fuel pump, i.e. the risk of a car fire
> is decreased.   
> >
> >To do what you want to do, even if it was necessary, you would have
> to engergize the fuel pump via a "hot" switch, pressurize the fuel
> system, and THEN remember to turn the "hot" switch off and then start
> the car normally.  However, IF you forgot to turn the hot switch off,
> it could get real "HOT" in an accident.  
> >
> >If there is a fuel line draining issue, its probably better (safer)
> to replace the check valve which has failed, which in this case, I
> believe, is in the fuel pump.  Fuel pump is probably due for
> replacement anyway.
> >
> >A fuel pump replacement procedure that I wrote up is available at:
> >
> >http://forums.audiworld.com/s4s6/msgs/86586.phtml
> >
> >Dave F.
> >
> >
> >
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