Richard -
The L-jet in the GTV-6 and Milano is NOT exactly the same as that in
the Spider.
In the GTV-6 and Milano the fuel pump will run if the key is on, and
you manually open the door on the AFM.
Not so on the Spider.
You'd think that since both systems are L-jet that they would work and
behave similarly, don't ask me why, but they don't.
Jeff
Sent from my iPhone
On Sep 21, 2009, at 1:20 PM, "Richard C. Wagner" <[email protected]> wrote:
Joe asked:
Jeff,
Are you sure that the fuel pump runs when the key is first turned
on? I'm not intimately familiar with Spiders, but I've never known
an L-Jet system to run the fuel pump unless the engine is running or
the key is in the Start position.
And Jeff responded:
Yes, absolutely.
It will run for a second or less to pressurize the system when the
key
is first turned on.
That hasn't been my experience with the L-Jetronic system on my
GTV6. On my car, the pump runs when the starter is energized, and
when the ignition is on and the flap of the airflow meter is
opened. It never runs when the engine is stopped and the key is
simply turned to the "on" position. Based on Tess' description, it
sounds to me like her pump is running with the starter energized,
and then stopping when she releases the key. I don't have a Spider
wiring diagram here, but it might be productive to check and see if
the pump is powered by two separate, fused circuits; two separate
switching circuits to the relay (one from the starter switch, one
from the ECU); and how the fuel pump inertial switch is wired in (it
could be tripped). I've heard many times that the Spider doesn't
use the massflow-based switch to turn on the pump, and instead uses
the flywheel sensors. So the sensors could also be a culprit.
Tess, I'd suggest this test: have a friend connect a 12-volt test
light to the power terminals of the fuel pump, then have him/her
watch as you crank the engine. The light should come on with
cranking and stay on until the engine comes to a stop. If the light
comes on with cranking and then goes off as soon as the starter
stops, there is a problem in some part of the circuitry that I've
mentioned.
Rich Wagner
Montrose, CO, USA
'82 GTV6
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