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With the safety-cut-out, the electric fuel pump is switched off when, e.g. in the event of an accident, the engine stops and the ignition remains switched on.
This device also protects the fuel pump against damage (risk of overheating), which can occur when the engine stops, but the ignition is still on.
A suitable socket is available under part no. 251937501B.
For safety reasons, the fuel pump should not pump when the engine is off. This is not a problem with a mechanical pump but becomes a problem when switching to an electric pump.
In this case, this safety relay ensures that the pump does not run when the engine is stopped and the ignition switch remains on.
In the event of an accident, it prevents fuel from being pumped out of the tank and serving as fuel for a possible fire.
For this reason, this safety shutoff relay is a compact solution that ensures just that.
When the ignition is turned on, the relay activates the fuel pump for about 2 seconds and then turns it off again if the engine is not started.
This prevents the risk of overheating the pump. Therefore, the relay is activated only when it is detected that the engine is running through the connection to the ignition coil.
If the engine stops, the relay cuts off power to the fuel pump.
Simple. Safe. Proven.
Adapted for use with Pierburg fuel pump (part number S13083G)
In addition, it is universally applicable to all electric gasoline pumps, for switching daytime running lights, rear window or other electrical loads with a maximum current draw of 8A.
It can be used with conventional ignition systems.
CAUTION The resistance of the ignition coil must not be less than 2 ohms on the primary winding.
How to wire:
Terminal 30 = 12V DC supply (battery +), insert an 8A in-line safety fuse (part no. DAP267), generally a red cable is used.
Terminal 15 = 12V power supply under lock and key (e.g. terminal 15 – positive ignition – on the coil), usually a black cable is used.
Terminal 87 = to positive (+) of electric fuel pump, usually a red/blue cable is used. The pump must then be grounded with a brown cable.
Terminal 31 = to ground – metal on the vehicle body -, a brown cable is generally used.
Terminal 31b = to terminal 1 of the coil, a green cable is generally used.
