The oil pressure switch from a Chevrolet Vega works real well (that's what I
use with my electric pump). When you get it, notice how it looks exactly like
the 3 connection oil pressure switch that was on late TR6's (hint - you can
use it there, too). Since it has three connections, it is possible to wire it
so the pump turns on when the starter motor is on, then reverts to a safety
(only works with oil pressure) switch when the engine is running You should be
able to find it at any NAPA, Pep Boys, Kragen's, Checker, AutoZone, etc store
for about $7.00.
Hugh Barber
Hollister, CA
'73 TR6
Randall wrote:
> Some early VW's ('72 Rabbit ?) used a relay that sensed pulses from the
> points to control the electric fuel pump. Probably too expensive new,
> but you might find one in a junk yard, on about anything with Bosch fuel
> injection and points. The relay is real distinctive, it has a fuse clip
> sticking out the top.
>
> I like the oil pressure switch idea better, but instead of trying to tap
> into the existing sender, I'd go for a separate switch. You should be
> able to find a switch that closes around 5-10 psi in a speed shop.
>
> Randall
>
> "Keith S. Ehrlich" wrote:
> >
> > A number of folks at VTR suggested I replace my mechanical fuel pump
> > with a low pressure electric pump to better feed the Webers. In the
> > interest of safety, how could the electric pump be wired to guarantee
> > its shutoff in the event of a collision? I heard one concept about
> > routing the wiring through the oil pressure sensor, which sounded nifty.
> > Any other suggestions?
> >
> > Thanks
> > Keith Ehrlich
> > 74 TR6
> >
> > PS BTW the intermittent power loss I suffered a few weeks back turned
> > out to be the mechanical fuel pump ( now replaced), which apparently was
> > slowly going bad to the point where it could not keep up with the Webers
> > at idle. The bowls would go almost dry before I'd drive off and the call
> > for fuel under acceleration would finish off what fuel was left thus
> > causing a power loss to follow until the fuel would begin to flow back
> > into the bowls under higher RPM pressure. Nasty little problem to find.
> > Thanks to all the listers who helped me bracket my way through the
> > systems to isolate it.
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