Join Date: Nov 2009
Location: Near Olney, MD
Ferrari Life Posts: 1,354
Here are some pics of the AFM and the blue connector on the safety switch. The AFM is the large disk below the air filter. With the key in the on position you should be able to push down on the AFM disk lightly and you should hear the fuel pump turn on.
Don't go crazy with this since you can fill the engine up with fuel if you keep playing with it and running the fuel pump. Just a quick test to make the fuel pump run. You should have no problem hearing the pump. It is in the lower left of the engine compartment behind the drivers seat. If you listen near the drivers side wheel well you can easily hear the pump when it kicks on.
When you turn the key to "on", both relays "u" and "s" should activate. In a quiet garage, you'll hear them click. In a noisy garage, you can feel them activate, if you place a finger on them. (Be advised - they get warm.)
When you turn the key to "start", that runs power through relay "s" to activate relay "r" which powers the fuel pump. When the car begins to injest air, the AFM plate moves off its rest position, opening the safety switch. That deactivates relay "s", and ignition power (from relay "u") holds relay "r" active. If the car stalls, the AFM plate returns to rest, activating relay "s" and cutting off power to the fuel pump relay "r" until you hit the starter again.
If you turn the key to "on" and press on the AFM plate, relay "s" should click off and relay "r" should click on ... and the fuel pump should run.
Last edited by KKRace; 01-04-2010 at 01:14 PM.