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Ford Focus · 2021

2021 Ford Focus Fuel Pump Fuse & Relay

Engine cranks but won’t start? The fuel pump fuse and relay are quick to check.

  • UK specification
  • Verified data
  • Checked 14 October 2026
  • Sources

Quick answer

Verified

Applies toFocus (2018) · Built from 27 April 2020Focus (2018) · Built 2 November 2020 to 14 March 2021Focus (2018) · Built 15 March 2021 to 28 November 2021Focus Vignale (2018) · Built from 27 April 2020Focus Vignale (2018) · Built 2 November 2020 to 14 March 2021Focus Vignale (2018) · Built 15 March 2021 to 28 November 2021

Fuel pump - diesel.

Fuse
4A
Amperage
20A
Fuse box
Engine compartment
Location
In the engine compartment

Fuel pump - gasoline.

Fuse
4B
Amperage
20A
Fuse box
Engine compartment
Location
In the engine compartment

Where is the fuse box?

Engine compartment fuse box

In the engine compartment

Our source doesn’t describe how to open this fuse box. Check your owner’s handbook.

Fuse box diagram

Full 2021 Ford Focus fuse chart

We haven’t drawn a schematic of the engine compartment fuse box for this version yet. Use the fuse and relay numbers on this page and the legend on the fuse box to find the right position.

Where to look

  • 4A

    In the engine compartment

    Fuse ·20A · Fuel pump - diesel.

    Position not shown on the schematic. Find fuse 4A on the fuse box legend.

  • 4B

    In the engine compartment

    Fuse ·20A · Fuel pump - gasoline.

    Position not shown on the schematic. Find fuse 4B on the fuse box legend.

Always confirm the number against the legend on the fuse box cover before pulling anything.

How to replace the fuse safely

  1. Switch off the ignition and all electrical equipment. Take the key out, or move a keyless fob away from the car.
  2. Open the fuse box and find the fuse using the number on the cover legend or the chart on this page.
  3. Pull the fuse straight out with the plastic fuse puller (usually clipped inside the fuse box) or fine-nose pliers.
  4. Look at the metal strip inside the fuse. A broken or burnt strip means it has blown.
  5. Fit a new fuse with exactly the same amperage rating. The number on top and the colour should match.
  6. Refit the cover, switch on and test the component.
  • Never fit a fuse with a higher amperage rating than specified. It can let wiring overheat.
  • Never bridge a fuse with wire, foil or anything else.

Fuse keeps blowing?

A fuse that blows again straight away is doing its job. Something on that circuit is drawing too much current. Common causes are damaged wiring shorting to the bodywork, a failing motor or socket, water getting in, or a faulty accessory. Fitting fuse after fuse, or a bigger fuse, won’t fix the fault and can overheat the wiring. Have the circuit tested by an auto electrician.

Not the fuse? Check these next.

  • Fuel cut-off switch

    Many cars cut the fuel pump after a jolt or impact. Your handbook will show if there is a reset switch.

  • Listen for the pump

    Turn the ignition on and listen for a short hum from under the rear seat. Silence suggests a power or pump fault.

  • Fuel level

    A faulty fuel gauge can hide an empty tank. Add a few litres before going further.

  • Fault codes

    An OBD scanner can show stored codes for fuel pressure or pump circuit faults.

Sources & verification

Applies toFocus (2018) · Built from 27 April 2020

Status
Verified
Specification
UK market
Last checked
14 October 2026

Applies toFocus (2018) · Built 2 November 2020 to 14 March 2021

Status
Verified
Specification
UK market
Last checked
14 October 2026
  • Manufacturer manual listingFord UK — 2021 Focus (2018) owner manuals · Ford Motor Company · Owner’s Manual (Vehicles Built From: 02/11/2020 Vehicles Built Up To: 14/03/2021) · Accessed 14 October 2026
  • Owner’s manualFord Focus (2018) Owner’s Manual — CG3784en, edition 08/2020 · Ford Motor Company · Fuse specification chart — Engine compartment fuse box (pp. 403–406); Fuse specification chart — Passenger compartment fuse box (pp. 406–408); Fuse specification chart — Trailer tow module fuse box (5-door and wagon) (pp. 408–408) · Accessed 14 October 2026

Applies toFocus (2018) · Built 15 March 2021 to 28 November 2021

Status
Verified
Specification
UK market
Last checked
14 October 2026
  • Manufacturer manual listingFord UK — 2021 Focus (2018) owner manuals · Ford Motor Company · Owner’s Manual (Vehicles Built From: 15/03/2021 Vehicles Built Up To: 28/11/2021) · Accessed 14 October 2026
  • Owner’s manualFord Focus (2018) Owner’s Manual — CG3784en, edition 12/2020 · Ford Motor Company · Fuse specification chart — Engine compartment fuse box (pp. 397–400); Fuse specification chart — Passenger compartment fuse box (pp. 400–402); Fuse specification chart — Trailer tow module fuse box (5-door and wagon) (pp. 402–402) · Accessed 14 October 2026

Applies toFocus Vignale (2018) · Built from 27 April 2020

Status
Verified
Specification
UK market
Last checked
14 October 2026

Applies toFocus Vignale (2018) · Built 2 November 2020 to 14 March 2021

Status
Verified
Specification
UK market
Last checked
14 October 2026

Applies toFocus Vignale (2018) · Built 15 March 2021 to 28 November 2021

Status
Verified
Specification
UK market
Last checked
14 October 2026

Fuse layouts can differ between trim levels and optional equipment. Always confirm against the legend on your fuse box.