RWD Volvo models had a pre-pump in the tank and a
main pump under the car just before the fuel filter. They
went to a single pump system on the front wheel drive
models. If anyone will use these you need both pumps
or the main pump will not get the pressure high enough.
Thomas
Patrick J. Horne skrev:
> Volvo 240 and 260 series used electric fuel pumps and controlled them a
> bit differently. They have a relay that is connected to the ignition
> switch so it will turn on for a few seconds when the key is turned on,
> then it turns off. It also is connected to the ignition system and
> monitors pulses from the distributor (points or electronic). When it sees
> pulses, it turn on the pump. No pulses, no pump.
>
> Peace,
> Pat
>
> - Support Habitat for Humanity, A "hand up", not a "hand out" -
>
> Pat Horne, Network Manager, Shop Supervisor, Future planner
> CS Dept, University of Texas, Austin, Tx. 78712 USA
> voice (512)471-9730, fax (512)471-8885, horne@cs.utexas.edu
>
> On Tue, 28 May 2002, John F Sandhoff wrote:
>
> > A couple of comments:
> > > (Who makes a good electric fuel pump, and where should it be
> > > installed on a Roadster.
> >
> > Electric pumps should be mounted as close to the tank as is practical.
> > Electrics are meant to push the fuel, not pull it. Also, the point of going
> > electric is to keep the fuel system at a positive pressure.
> >
> > This also means that you should be certain all your hoses and lines
> > are in good shape!
> >
> > > Also, what is the importance of an oil pressure safety switch if
> > > installing an electric fuel pump.)
> >
> > Your life. Your passenger's life. The life of others involved in a collision
> > with your car.
> >
> > If you hit something, or roll over, and your fuel line ruptures, the
>electric
> > pump will happily spray gasoline all over the place. A cutoff switch will
> > shut down the pump before it creates a 5 gallon puddle in the street.
> > Anybody running an electric should put in some form of collision switch!
> > Holley makes a three-wire one that will activate the pump during
> > cranking and when there's oil pressure (you need to activate the pump
> > before the engine will start if the carbs are dry).
> >
> > -- John
> > John F Sandhoff sandhoff@csus.edu Sacramento, CA
> >
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