mercedesbenz Workshop Repair Guides

Mercedes Benz Workshop Service and Repair Manuals

Relays and Modules - Restraint Systems > < Engine Controls - Engine Won't Start When Hot|Page 841
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Fuel Pump Relay: Description and Operation

GF47.20-P-2010V Fuel Pump Relay, Component Description

Location

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Model 171: at the front of the luggage compartment

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Model 203, 209, 211, 219: at the left in the luggage compartment

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Model 164: at the right in the load compartment.

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Model 251: at the right in the spare wheel well

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Model 221: under the through-loading feature/ski bag

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Model 230: at the passenger-side fuse and relay module.

Task

The fuel pump relay actuates the fuel pump with voltage via a fuse.

Function

When actuated by the motor electronics control unit, with a ground signal at circuit 86, the relay closes its power contact. When the power contact is
closed the fuel pump is connected to circuit 30 (B+) via circuit 87.

To actuate the fuel pump relay and bridge terminal 30 and 87.

Relays and Modules - Restraint Systems > < Engine Controls - Engine Won't Start When Hot|Page 841