What does the inertia fuel shut-off switch do?

Per the diagram, it is a safety device that cuts power to the electric fuel pump if a collision occurs, opens on impact, and must be reset manually.

What fuse powers the fuel pump circuit?

A 20A 'FUEL PMP' fuse in the engine compartment fuse box, hot at all times (referenced to page 13-5).

What wire color feeds the fuel pump from the inertia switch?

Circuit 787 PK/BK (pink/black) runs from the inertia switch connector C466 toward the fuel tank assembly and instrument cluster path.

What are the fuel sender resistance values?

The sender is a variable resistor connected to a float: resistance is low (16 ohms) when the tank is empty and high (160 ohms) when the tank is full.

What does the fuel pump relay do in this circuit?

The diagram states the fuel pump relay directs voltage to the fuel pump and the PCM; it receives power on circuit 1059 LB/O and outputs on circuit 238 DG/V.

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Ford Fuel Pump Wiring Diagram - Inertia Switch, Relay & Sender Circuit (Gasoline)

Gasoline engine wiring diagram for fuel pump relay, inertia switch and fuel tank sender

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Wiring diagram showing the fuel pump relay, inertia fuel shut-off switch and fuel tank pump/sender circuits.

AI caption February 2007 · Photo 48 of 185

This document is a Ford factory-style wiring diagram (EVTM page) for the electric fuel pump circuit on a gasoline-engine vehicle. It traces power from a 20A FUEL PMP fuse in the engine compartment fuse box (hot at all times) through circuit 1059 LB/O to the fuel pump relay in the relay center (pins 30, 85, 86, 87), which the diagram notes 'directs voltage to fuel pump and PCM.' Output circuit 238 DG/V runs through the fuel pump prime connector (C187), connectors C102M/C102F and C206M/C206F, to the inertia fuel shut-off switch, described as a safety device that cuts power to the electric fuel pump in a collision and must be manually reset. From the switch, circuit 787 PK/BK feeds the fuel tank assembly's fuel pump and sender via connectors C464F/C464M. The fuel gauge sender is described as a variable resistor on a float: 16 ohms when empty, 160 ohms when full, feeding the instrument cluster on circuit 29 V/W (connectors C251/C255, splice S202). Grounds are 57 BK to G400 and 676 PK/O to G201 via S402. Footnotes indicate the circuit is not for police options and marks digital cluster variations. Cross-references include pages 13-5, 23-2, 60-1, 65-1, 10-7, and 10-13.

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Frequently asked questions

What does the inertia fuel shut-off switch do?: Per the diagram, it is a safety device that cuts power to the electric fuel pump if a collision occurs, opens on impact, and must be reset manually.
What fuse powers the fuel pump circuit?: A 20A 'FUEL PMP' fuse in the engine compartment fuse box, hot at all times (referenced to page 13-5).
What wire color feeds the fuel pump from the inertia switch?: Circuit 787 PK/BK (pink/black) runs from the inertia switch connector C466 toward the fuel tank assembly and instrument cluster path.
What are the fuel sender resistance values?: The sender is a variable resistor connected to a float: resistance is low (16 ohms) when the tank is empty and high (160 ohms) when the tank is full.
What does the fuel pump relay do in this circuit?: The diagram states the fuel pump relay directs voltage to the fuel pump and the PCM; it receives power on circuit 1059 LB/O and outputs on circuit 238 DG/V.