How is fuel pressure controlled in a fuel pump?

Pressure is controlled by a fuel pump driver module (FPDM) or a fuel pump control module (FPCM) in response to commands from the PCM. On these systems, fuel pressure is managed by controlling the speed of the fuel pump.

Where can I buy a new FPDM for my truck?

New FPDMs can be purchased from the dealer, for an estimated $84. The original FPDM part number for lobo2mil4’s truck was 3F2A-9D370-BA, the part number on the new one was 5L8Z-9D370-A. The correct one for your truck may be a different part number and/or cost.

What’s the maximum duty cycle for a fuel pump?

For instance, on Ford models, the maximum fuel pump duty cycle is 50%. This runs the pump at full speed to generate maximum pressure during wide-open-throttle or start-up. When the PCM commands 25% duty cycle, it’s actually a command to turn the fuel pump off.

What are the specifications for a fuel pump?

There are two fuel pressure specifications for every vehicle: system pressure and hold pressure. Hold pressure is maintained by the fuel pump’s check valve when the engine is turned off. This makes it easier to start the engine.

How to check for a faulty fuel pump?

THIS WILL POWER THE PUMP TO RUN AND CHECK FOR A FAULTY FUEL PUMP. 3. NEXT, CHECK FOR FUEL PUMP SIGNAL AT THE FUEL SYSTEM CONTROL MODULE. 4. FIND THE DARK GREEN/WHITE WIRE IN PIN13. WITH A TEST LIGHT CONNECTED TO THAT WIRE, TURN THE KEY TO THE RUN POSITION.

How does the fuel pump control module work?

The pump control module sends a diagnostic signal back to the PCM indicating actual duty cycle of the fuel pump. This provides a feedback loop so the PCM can determine if actual pump speed matches the commanded speed. These signals are also displayed on a scan tool, and some scan tools allow you to issue pump speed commands with the tool.

How to check fuel pump signal in gmflash?

1. CONNECT PIN1 (BLACK GROUND) TO PIN16 (PINK GROUND) 2. CONNECT PIN32 (RD/WH BATT + ) TO PIN47 (GY FUEL PUMP 12+) THIS WILL POWER THE PUMP TO RUN AND CHECK FOR A FAULTY FUEL PUMP. 3. NEXT, CHECK FOR FUEL PUMP SIGNAL AT THE FUEL SYSTEM CONTROL MODULE. 4. FIND THE DARK GREEN/WHITE WIRE IN PIN13.

Where do I find the fuel pump code?

The Powertrain Control Module (PCM) or the Engine Control Module (ECM) normally identifies this code, however other supporting modules can also spark up this particular code such as: Alternative Fuel Control Module Fuel Injection Control Module

How to tell if a fuel pump is an open circuit?

Given the fact that the cause of P062A code could be an open circuit, you should identify the circuit using an electrical wiring diagram out of your service manual. Once identified, you can trace the individual fuel pump A control wire individually to see if there are any obvious breaks in the wire.

What causes a fuel pump control circuit to chafe?

Causes for this code may include: Issues with the fuel pump itself Severed or damaged ground wire in the device’s control module Unattached ground strap in the control module Open, shorted, or corroded wiring in the CAN bus Unsecured harnesses and wires causing a chafe or broken circuit

How is fuel pressure controlled in a fuel pump?