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Kris,
Answers (and some personal opinions) below.
Hi All,
I have an Bosch alternator off a Bluebird in my 1600 and was wondering if
the "black plastic" terminal marked "+" is/can be used to supply an
electric fuel pump also from a Bluebird and what size fuse should i
use?
[Terry
Rudd] Yes it can be used to power a relay, as it's the same wire
that connects onto the main battery lug on the starter motor, also it
branches off in the loom to the fuse box (big wire with connector in front of
the fuse box.) I don't use a Bluey pump any more as I found them a tad
unreliable for race conditions but I would think a 10 or 15 amp
fuse on the battery feed to the relay suits most LP pumps. I use a Denso LP
pump of a Mazda RX7 EFI and it draws around 5 amps, I imagine a Bluey pump is
rated similarly. If you mount the pump behind the stock battery position The
closest ignition sense source is found at position 4 (white/blue
wire) on the old 6 pin Hitachi external voltage regulator plug that was
disconnected to get the Bosch alternator
running.
Fuel Pump.
Wire
the relay thus:
Pin
30 - fused power from battery supply (4 mm)
Pin
85 - Earth (2 mm)
Pin
86 - Ignition (2 mm)
Pin
87 - Pump (+) (4 mm shielded)
Pump
(-ve) to Earth (2 mm)
* By shielded I mean run it inside that black stuff that's used on
modern day cars that protects wires from insulation damage especially if the pump is located in or around
the boot for EFI applications i.e. surge tank feed.
[Terry
Rudd]
You can control the relay on/off
operation a number of ways.
1. Electronic device that senses
the coil is pulsing i.e. engine running etc and controls sense (ignition)
and/or earth function to the relay. Will control relay after Ign ON but
you don't start as well as stall.
2. Gas switch which does the same thing
but usually has no control over timings etc i.e. they turn the pump
off 2 seconds after stall is detected but will run continuously after Ign ON
before start.
3. Oil pressure switch (Holley) Here's a
diagram off the Holley web site - pretty nifty and been used on many an
EFI conversion as it's a mandatory safety item in some places and there wasn't
many alternative around 10 years ago. I've fitted a few of these on a 1600 and
they work well, no timings like the electronic types around now and these
could be more expensive as they're made in the USA. They also need a 1/8"
BSP (British Standard Pipe) adapter for L and from memory FJ
series.
Oil Pressure Safety
Switch
It's always a good idea to place a safety switch in the
circuit when installing an electric fuel pump. Holley has one available under
P/N 12-810. This switch will ensure that the electric pump will not work
unless the engine has oil pressure. It will prevent the pump from running in a
situation where the motor may stall with the ignition ON. Wiring the switch
through the starter solenoid circuit energizes the pump on engine start-up.
After the engine is running the switch continues to provide power to the pump
as long as there is oil pressure to keep the switch turned on.
![]()
Does this terminal only supply power when
the car is running or is it live all the time? I don`t have a tester to
tell.
[Terry
Rudd] It's live all the time as it's connected to the positive
battery lead at the starter motor.
Also does this pump flow more than the
mechanical type?
[Terry
Rudd] Electric pumps usually have significantly more flow but lower
pressure than L series mechanical pumps - they suit webers to a tee. They need
to be insulated well from the body mountings as they tend to
be noisy.
Thanks,
Kris.
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