[KKRace]

Here is what to check when your 328 won't start. If you have ignition spark and the car will not start most likely this is the problem. If you car is currently working, go out and try this. Turn the key to the on position and you should here the electric fuel pump run for a few seconds and then go off. It's a good idea to get to know this sound in case you have a problem someday and the first thing someone will ask is "do you hear the fuel pump when you first turn the key".

[KKRace]

Here is the Bosch part number for the pump if you have tried everything first and have decided you need a pump.

328 Fuel Pump
F PN 121727
Bosch 0 580 254 947
(Bosch USA 5-digit PN 61947)

Buy from any Bosch supplier -- e.g., www.importeccatalog.com (type in the 10-digit Bosch PN or the 5-digit Bosch USA PN)

[KKRace]

Here is the schematic of the fuel pump circuit: The relays shown are U,S and R. IF you pull relay "R" and jumper pin 30 to 87 you will have bypassed all the relays and the fuel pump should run assuming you have the key on and 12v at F20 and Pin 30.

[KKRace]

Here is the fuse panel layout. Notice the relays and connectors down low in the pic. They are behind a panel in the passenger footwell. To access just pull back the carpet and remove the four screws holding the panel.

[KKRace]

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.

[KKRace]

If you don't hear the pump run when you first turn the key to the on position or when you push down on the AFM diaphram the next step is to remove the relay "R" and jumper pin 87 to pin 30 as shown. If the pump is still not getting power check for 12volts on connector "W" pin 4

If the pump starts to run when you jumper the pins you could have a problem with one of the relays or the AFM switch. If you have power on the brown wire on connector W after jumpering the pins but the fuel pump still does not have power then pull back the carpet on the passenger side and remove the panel.

[KKRace]

These pics show a common problem with one of the connectors (connector 144 in the factory schematics)for the fuel pump located in the passenger footwell. On mine I was able to clean up the contacts but others have either replaced them or just removed the two wires and soldered them together to bypass the connector.

If you are doing winter maintenance it might be a good idea to look at this connector and clean up the contacts! Might save you from getting stuck somewhere this summer!

[IPF]

Originally Posted by KKRace

Here is what to check when your 328 won't start. If you have ignition spark and the car will not start most likely this is the problem. If you car is currently working, go out and try this. Turn the key to the on position and you should here the electric fuel pump run for a few seconds and then go off. It's a good idea to get to know this sound in case you have a problem someday and the first thing someone will ask is "do you hear the fuel pump when you first turn the key".

Kevin,

This sure is an interesting thread, thanks! Will try it out next time I start my baby up (which may be a while, since it's snowing and freezing out here )

Irvin

[KKRace]

If you think you have a relay problem and want to test they are not all identical!! You can swap "s" with "d" or "e" (headlamp lifting motors), or "u" or "r" with "l" or "m"

[KKRace]

Here is a link to a site that has the 328 manual, wiring diagrams and schematics posted as well as some other cars. http://www.stevejenkins.com/ or http://ferrari.stevejenkins.com/books/