What wire color feeds the inertia fuel shutoff switch on a 1994 Bronco/F-Series 5.0L?

Circuit 238 DG/Y (dark green/yellow) from connector C202 feeds the inertia fuel shutoff switch through connector C271, with 12V present when the fuel pump relay is energized.

What does the inertia fuel shutoff switch do?

It is a safety device that shuts off power to the electric fuel pump if a collision occurs; the switch opens on impact and must be reset manually.

What wire color goes to the fuel pump on a 1994 Bronco 5.0L?

Circuit 787 PK/BK (pink/black) carries 12V from the inertia switch through connectors C205 and C441 to the fuel pump/fuel gauge sender. Ground is 57 BK and 89 O through splice S400 to ground G100.

What are the fuel gauge sender resistance values on the 1994 Bronco?

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

Which circuits feed the front and rear tank fuel pumps on the 1994 F-Series dual-tank setup?

From the fuel tank selector switch (via C268), circuit 786 R feeds the front tank pump through connector C440, and circuit 789 BR/W feeds the rear tank pump through connector C441.

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1994 Ford Bronco/F-Series 5.0L Fuel Pump Wiring Diagram - Engine Controls 24-8

1994 Bronco/F-Series 5.0L inertia fuel shutoff and fuel pump/sender wiring (page 24-8)

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Ford 1994 Bronco/F-Series 5.0L engine-controls schematic (24-8): inertia fuel shutoff switch, fuel tank selector, front/rear fuel pumps and fuel-gauge senders; sender 22.5 ohms empty to 145 ohms full.

AI caption February 2007 · Photo 246 of 1902

This is page 24-8 of a 1994 Ford Bronco/F-Series factory wiring manual, covering the fuel pump wiring within the Engine Controls (5.0L) section. Two side-by-side schematics are shown: one for the F-Series (dual tank) and one for the Bronco (single tank). Both circuits begin at connector C202 (from page 24-1) with circuit 238 DG/Y feeding the Inertia Fuel Shutoff switch (which opens on impact and must be manually reset) via connector C271. On F-Series, power then flows on circuit 670 R/Y through C268 to the Fuel Tank Selector Switch, then via circuit 786 R (front tank) or 789 BR/W (rear tank) through C205, C440 and C441 to the front and rear tank fuel pump/fuel gauge senders, grounding through circuit 89 O to splice S400, 57 BK, and ground G100. On the Bronco, circuit 787 PK/BK passes through C205 and C441 to the combined fuel pump/fuel gauge sender, with circuit 29 Y/W to the instrument cluster; the sender is a variable resistor (22.5 ohms empty, 145 ohms full). Ground path is 57 BK/89 O through S400 to G100. Cross-references point to grounds pages 10-2/10-5, pages 49-2, 60-1, and Section 152 for connector locations.

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Frequently asked questions

What wire color feeds the inertia fuel shutoff switch on a 1994 Bronco/F-Series 5.0L?: Circuit 238 DG/Y (dark green/yellow) from connector C202 feeds the inertia fuel shutoff switch through connector C271, with 12V present when the fuel pump relay is energized.
What does the inertia fuel shutoff switch do?: It is a safety device that shuts off power to the electric fuel pump if a collision occurs; the switch opens on impact and must be reset manually.
What wire color goes to the fuel pump on a 1994 Bronco 5.0L?: Circuit 787 PK/BK (pink/black) carries 12V from the inertia switch through connectors C205 and C441 to the fuel pump/fuel gauge sender. Ground is 57 BK and 89 O through splice S400 to ground G100.
What are the fuel gauge sender resistance values on the 1994 Bronco?: The sender is a variable resistor: 22.5 ohms when the tank is empty (low fuel) and 145 ohms when full (high fuel).
Which circuits feed the front and rear tank fuel pumps on the 1994 F-Series dual-tank setup?: From the fuel tank selector switch (via C268), circuit 786 R feeds the front tank pump through connector C440, and circuit 789 BR/W feeds the rear tank pump through connector C441.