[s-cars] fuel pump switch
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:
> 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
> 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
> I ran a can of B&G 44K through the tank, indicating that the check
> 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
> 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
> 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
> the knee panel?
> 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:
> >Dave F.
> >This e-mail and its attachments are intended solely for the person
> or entity
> >to which it is addressed and may contain confidential and/or
> >information. Any review, dissemination, copying, printing or other
> use of
> >this e-mail by persons or entities other than the addressee is
> >If you have received this e-mail in error, please contact the sender
> >immediately and delete the material from any computer.
> >S-CAR-List mailing list
> >S-CAR-List at audifans.com
> S-CAR-List mailing list
> S-CAR-List at audifans.com
Make April 15th just another day http://www.fairtax.org
Yahoo! for Good - Make a difference this year.
More information about the S-CAR-List