mercedesbenz Workshop Repair Guides

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Fuel Pump Relay: Description and Operation
GF54.15-P-4105-02L Fuel Pump Relay Function

GF54.15-P-4105-02L Fuel Pump Relay Function

The fuel pump relay (K27) is switched by a ground signal from the control unit at terminal 86. If the contact is closed, the fuel pump (M3) is connected
to terminal 30 (B+) via terminal 87. Circuit 30 is protected by a 30 A fuse.

With models 129, 140, 202, 208, the fuse is attached to the relay.

On vehicles with two fuel pumps, the pumps are connected in parallel.

Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Description and Operation > Fuel Pump Relay, Location/Task/Design/Function > Page 3902

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