What relay powers the fuel pump in this diagram?

The Fuel Pump Relay, located in the Power Distribution Box (page 13-1), directs voltage to the fuel pump and PCM. It is fed by circuit 361 R from S123 and fuse 12 (20A) via circuit 1050 LB/O.

What does the Inertia Fuel Shutoff do?

It is a safety device that cuts off voltage to the Fuel Pump in the event of a collision. It sits in the DG/Y (circuit 238) feed between the Fuel Pump Relay and the fuel pump.

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

Circuit 787 PK/BK (pink/black) runs from the Inertia Fuel Shutoff through connectors C212 and C311 to the Fuel Pump/Sender in the Fuel Tank Assembly.

Which fuses supply these circuits?

Interior Fuse Panel fuse 13 (25A, hot in start or run), Power Distribution Box fuse 13 (30A), fuse 4 (20A), and fuse 12 (20A), all hot at all times.

What functions does the PCM control according to this diagram?

The PCM receives inputs from various sensors and controls Fuel Flow, Exhaust Gas Recirculation (EGR), Ignition System Functions, Engine Idle Speed, Fuel Evaporation to the atmosphere, and Transmission Controls (4R70W).

Where are the ground points for the fuel pump circuit?

Grounds G101 and G204 via black (57 BK) and black/yellow (651 BK/Y) wires through splices S235 and S234; see Grounds pages 10-6, 10-7 and 10-8.

Home/ Registry/ Ford/ F-250/ 1987-1991/ “Creampuff”/ Photo supermotors.net/registry/media/1051974

Ford Fuel Pump & PCM Power Wiring Diagram - Relays, Inertia Switch, Circuits

Fuel pump and PCM wiring diagram with inertia fuel shutoff and color codes

‹ ›

Wiring diagram of fuel pump relay, inertia fuel shutoff and PCM power circuits with color-coded wires and fuel tank sender.

AI caption March 2015 · Photo 68 of 343

This document is a Ford factory-style wiring diagram (EVTM page) covering the fuel pump and Powertrain Control Module (PCM) power circuits. It shows power feeds labeled 'HOT IN START OR RUN' and 'HOT AT ALL TIMES' from the Interior Fuse Panel (fuse 13, 25A) and the Power Distribution Box (fuse 13 30A, fuse 4 20A, fuse 12 20A). Circuits shown include the PCM Power Diode, PCM Power Relay, Fuel Pump Relay, Inertia Fuel Shutoff switch, Powertrain Control Module (solid state), Instrument Cluster connections, and the Fuel Tank Assembly with fuel pump/sender. Wire circuit numbers and colors are given throughout, e.g. 16 R/LG, 845 T/BK, 37 V, 460 V/LB, 361 R, 926 LB/O, 238 DG/Y, 787 PK/BK, 921 GY/O, 29 Y/W, 570 BK/W, 57 BK, 651 BK/Y, 1050 LB/O. Connectors identified include C115, C141, C147, C202, C203, C212, C311, with splices S105, S106, S113, S123, S137, S234, S235 and grounds G101, G204. Callout notes explain that the relays direct voltage to the fuel pump and PCM, the inertia switch cuts fuel pump voltage in a collision, and the PCM controls fuel flow, EGR, ignition, idle speed, fuel evaporation, and 4R70W transmission functions.

Is this accurate? Sign in to help verify it.

Frequently asked questions

What relay powers the fuel pump in this diagram?: The Fuel Pump Relay, located in the Power Distribution Box (page 13-1), directs voltage to the fuel pump and PCM. It is fed by circuit 361 R from S123 and fuse 12 (20A) via circuit 1050 LB/O.
What does the Inertia Fuel Shutoff do?: It is a safety device that cuts off voltage to the Fuel Pump in the event of a collision. It sits in the DG/Y (circuit 238) feed between the Fuel Pump Relay and the fuel pump.
What wire color feeds the fuel pump after the inertia switch?: Circuit 787 PK/BK (pink/black) runs from the Inertia Fuel Shutoff through connectors C212 and C311 to the Fuel Pump/Sender in the Fuel Tank Assembly.
Which fuses supply these circuits?: Interior Fuse Panel fuse 13 (25A, hot in start or run), Power Distribution Box fuse 13 (30A), fuse 4 (20A), and fuse 12 (20A), all hot at all times.
What functions does the PCM control according to this diagram?: The PCM receives inputs from various sensors and controls Fuel Flow, Exhaust Gas Recirculation (EGR), Ignition System Functions, Engine Idle Speed, Fuel Evaporation to the atmosphere, and Transmission Controls (4R70W).
Where are the ground points for the fuel pump circuit?: Grounds G101 and G204 via black (57 BK) and black/yellow (651 BK/Y) wires through splices S235 and S234; see Grounds pages 10-6, 10-7 and 10-8.