Hey Guys, There may be a ground wire in the boot that sometimes come loose or get corroded. My81 Fiat Spider with L-Jetronic mysteriously died one day. It took days to figure out. Don't know if the wire is in the same locatin on Alfas
Regards, Alex Toronto ----- Original Message ---- From: Richard C. Wagner <[email protected]> To: Alfa Digest <[email protected]> Cc: [email protected]; [email protected]; [email protected] Sent: Monday, September 21, 2009 5:20:07 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 -- to be removed from alfa, see http://www.digest.net/bin/digest-subs.cgi or email "unsubscribe alfa" to [email protected] -- to be removed from alfa, see http://www.digest.net/bin/digest-subs.cgi or email "unsubscribe alfa" to [email protected]
