What does the inertia fuel shutoff switch do on a 5.8L Ford Bronco or F-Series?

It is a safety device that shuts off power to the electric fuel pump if a collision occurs. It opens on impact and must be reset manually. It connects through connector C271 on circuit 238 DG/Y.

What are the fuel gauge sender resistance values?

The sender is a variable resistor connected to a float in the fuel tank: 22.5 ohms when the tank is empty (low fuel) and 145 ohms when full (high fuel).

What wire circuit feeds the Bronco fuel pump?

Circuit 787 PK/BK feeds the Bronco fuel pump/fuel gauge sender through connectors C205 and C441, with grounds on circuits 89 O and 57 BK through splice S400 to ground G100.

How do the F-Series dual tanks get power?

Circuit 670 R/Y goes through the Fuel Tank Selector Switch (connector C268, page 49-2), which sends 12V on circuit 786 R to the front tank pump/sender (C440) or 789 BR/W to the rear tank pump/sender (C441).

Which connectors are shown in this fuel pump circuit?

C202 (source, page 25-1), C271 (inertia fuel shutoff), C268 (F-Series tank selector switch), C205, C440 (front tank), and C441 (rear tank/Bronco sender), plus splice S400 and ground G100.

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Ford Bronco & F-Series 5.8L Fuel Pump Wiring Diagram - Engine Controls 25-6

Engine Controls wiring diagram, 5.8L, page 25-6, inertia fuel shutoff and fuel pump circuits for F-Series and Bronco

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Ford 5.8L engine controls wiring diagram of inertia fuel shutoff, fuel tank selector and fuel pump/sender circuits for F-Series and Bronco.

AI caption August 2018 · Photo 357 of 386

This is page 25-6 of a Ford factory wiring diagram set covering Engine Controls for the 5.8L engine, showing the fuel pump and fuel gauge sender circuits for both F-Series trucks and the Bronco. Power originates from connector C202 (page 25-1) on circuit 238 DG/Y, passing through the Inertia Fuel Shutoff switch (a safety device that cuts power to the electric fuel pump on impact and must be reset manually) at connector C271. On F-Series, circuit 670 R/Y feeds a Fuel Tank Selector Switch (C268, page 49-2), which routes 12V to either the front tank (circuit 786 R via C440) or rear tank (circuit 789 BR/W via C441) fuel pump/fuel gauge sender units, with grounds through circuit 89 O to splice S400 and 57 BK to ground G100 (grounds page 10-2). On the Bronco, circuit 787 PK/BK feeds a single fuel pump/fuel gauge sender at C441; the instrument cluster (page 60-1) connects via circuit 29 Y/W through C205. The sender is a variable resistor: 22.5 ohms empty, 145 ohms full. Bronco grounds run 89 O and 57 BK to S400 and G100 (grounds page 10-5). Wire colors, circuit numbers, and connector identifiers are labeled throughout.

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Frequently asked questions

What does the inertia fuel shutoff switch do on a 5.8L Ford Bronco or F-Series?: It is a safety device that shuts off power to the electric fuel pump if a collision occurs. It opens on impact and must be reset manually. It connects through connector C271 on circuit 238 DG/Y.
What are the fuel gauge sender resistance values?: The sender is a variable resistor connected to a float in the fuel tank: 22.5 ohms when the tank is empty (low fuel) and 145 ohms when full (high fuel).
What wire circuit feeds the Bronco fuel pump?: Circuit 787 PK/BK feeds the Bronco fuel pump/fuel gauge sender through connectors C205 and C441, with grounds on circuits 89 O and 57 BK through splice S400 to ground G100.
How do the F-Series dual tanks get power?: Circuit 670 R/Y goes through the Fuel Tank Selector Switch (connector C268, page 49-2), which sends 12V on circuit 786 R to the front tank pump/sender (C440) or 789 BR/W to the rear tank pump/sender (C441).
Which connectors are shown in this fuel pump circuit?: C202 (source, page 25-1), C271 (inertia fuel shutoff), C268 (F-Series tank selector switch), C205, C440 (front tank), and C441 (rear tank/Bronco sender), plus splice S400 and ground G100.