The L Jet spiders are a lot different than the Milano. The AFM flap has
to be open on the Milano. The L Jet apparently triggers the fuel pump with
the flywheel sensors. Or it does after the engine starts to turn.
It sounds to me like Tess has a problem with the run cycle of the
computer. The engine is starting on the cold start and the computer control
of the fuel pump is bypassed in the start cycle. Thus, she could be getting
enough fuel to fire the engine, but it dies when it tries to transition to the
run phase.
I would roll under the car and put a hand on the fuel pump. If it
vibrates at start, but quits vibrating when the key is released from the start
position, then that could be the problem.
I would be tempted to run a temporary jumper direct from the battery to
the fuel pump just long enough to test that theory.
Ciao,
Russ Neely
--- On Mon, 9/21/09, Brian Shorey <[email protected]> wrote:
From: Brian Shorey <[email protected]>
Subject: Re: [alfa] Re: Now I am Puzzled
To: "Richard C. Wagner" <[email protected]>, "Alfa Digest"
<[email protected]>
Cc: [email protected], [email protected], [email protected]
Date: Monday, September 21, 2009, 12:56 PM
Our LeMons Milano fuel pump runs as soon as the key is activated, it has
nothing to do with the AFM flap position. Kevin Redden insists it's wrong,
and he's probably correct, but it all works, so it's low on our priority
list.
bs
________________________________
From: Richard C. Wagner <[email protected]>
To: Alfa Digest <[email protected]>
Cc: [email protected]; [email protected]; [email protected]
Sent: Monday, September 21, 2009 1:20:07 PM
Subject: [alfa] Re: Now I am Puzzled
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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