What wire color and circuit number feeds the fuel pump from the EEC on a Bronco?

Circuit 276 on a BR (brown) wire runs from the Electronic Engine Control (pages 40, 36) through connector ZZ and C100 to the Inertia Switch; from there circuit 787 (PK/BK) continues through C100, C177, and C300 to the Inline Fuel Pump.

What does the inertia switch do in this fuel pump circuit?

The diagram labels the Inertia Switch as 'OPENS ON IMPACT' — it interrupts the 787 PK/BK circuit to the fuel pump in a collision.

What circuits connect the fuel gauge to the sender?

From the fuel gauge (page 88), circuit 29 (Y/W) passes through C100/C132 with circuit 673 (DB/Y), reaching the Fuel Gauge Sender and Pump assembly.

What is the ground path for the fuel pump on the Bronco diagram?

Circuit 57 (BK) runs from the Inline Fuel Pump through C300, splices S903 and S155, connector C108, splices S543 and S807, to ground G801. Grounds are detailed on pages 6-7.

How does the F-Series circuit differ from the Bronco circuit on this page?

The F-Series diagram adds splice S512, circuit 670 to connector C244, and circuit 786 on an R (red) wire running through C100 and C177 to the fuel gauge sender/pump, plus splice S154 and circuit 89 in the ground path.

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1989 Ford Bronco & F-Series Electric Fuel Pump Wiring Diagram (Single Tank) Pg 92

Electric fuel pump control wiring diagram page 92 single tank for Bronco and F-Series

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Wiring diagram of single-tank electric fuel pump control circuits, inertia switch, and fuel-gauge sender for Bronco and F-Series.

AI caption February 2011 · Photo 459 of 1799

This is page 92 of a Ford factory wiring diagram manual (EVTM-style) covering the Electric Fuel Pump Control circuit for single fuel tank configurations, with separate side-by-side diagrams for the Bronco and F-Series trucks. Both diagrams trace power from the Electronic Engine Control (referenced on pages 40 and 36) through connector ZZ on circuit 276 (BR wire) to the Inertia Switch, which opens on impact. From the inertia switch, circuit 787 (PK/BK) runs through connectors C100, C177, and C300 to the Inline Fuel Pump. The F-Series diagram adds splice S512, circuit 670, connector C244, and circuit 786 (R wire) routing. Ground paths use circuit 57 (BK) through connector C108 and splices S903, S155, S543, S807 to ground G801 (Bronco), with the F-Series also showing S154 and circuit 89. Both diagrams include the Fuel Gauge Sender and Pump assembly wired to the fuel gauge (page 88) via circuits 29 (Y/W) and 673 (DB/Y) through connector C132. A callout refers readers to grounds on pages 6-7. Background bleed-through text describes circuit operation, dual-tank selector switch behavior, component locations, and troubleshooting hints, but is only partially legible.

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Frequently asked questions

What wire color and circuit number feeds the fuel pump from the EEC on a Bronco?: Circuit 276 on a BR (brown) wire runs from the Electronic Engine Control (pages 40, 36) through connector ZZ and C100 to the Inertia Switch; from there circuit 787 (PK/BK) continues through C100, C177, and C300 to the Inline Fuel Pump.
What does the inertia switch do in this fuel pump circuit?: The diagram labels the Inertia Switch as 'OPENS ON IMPACT' — it interrupts the 787 PK/BK circuit to the fuel pump in a collision.
What circuits connect the fuel gauge to the sender?: From the fuel gauge (page 88), circuit 29 (Y/W) passes through C100/C132 with circuit 673 (DB/Y), reaching the Fuel Gauge Sender and Pump assembly.
What is the ground path for the fuel pump on the Bronco diagram?: Circuit 57 (BK) runs from the Inline Fuel Pump through C300, splices S903 and S155, connector C108, splices S543 and S807, to ground G801. Grounds are detailed on pages 6-7.
How does the F-Series circuit differ from the Bronco circuit on this page?: The F-Series diagram adds splice S512, circuit 670 to connector C244, and circuit 786 on an R (red) wire running through C100 and C177 to the fuel gauge sender/pump, plus splice S154 and circuit 89 in the ground path.