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Subaru Forester Fuel Pump Relays

Subaru Forester Fuel pump relays

Starting at low prices, AutoBuffy stocks multiple fuel pump relays from top OE-quality brands for the Subaru Forester. The fuel pump relay is an electrical switch that sends power to the fuel pump when you turn the ignition on. When it fails, the pump never receives power, leaving the engine unable to start or run — making a faulty relay one of the most common no-start causes.

Signs your Subaru Forester needs a new fuel pump relay

  • Engine cranks normally but refuses to start — the fuel pump never primes when the key is turned to 'on'
  • No audible 2-3 second fuel pump hum from the tank when the ignition is first switched on
  • Engine starts intermittently or dies shortly after startup, then restarts fine after sitting
  • Engine stalls suddenly at speed with no warning, especially in hot weather or after the engine reaches operating temperature
  • Fuel pump fuse tests good and wiring checks out, but the pump still receives no voltage at the pump connector
  • Scan tool shows no fuel system fault codes yet the engine will not start — pointing to a power-delivery problem upstream of the pump itself

Which fuel pump relay should you buy for your Subaru Forester?

Fuel pump relays are simple components, but choosing the right one comes down to fit, contact rating, and whether you want an OE-equivalent or an upgraded unit. The relay must match the exact amperage and pin configuration your Subaru Forester uses — a mismatch can prevent proper seating in the fuse box or cause premature failure. Check whether your Forester uses a dedicated standalone relay or a multi-function relay integrated with the PCM power circuit before ordering.

OE-Equivalent Replacement
Best for
Daily drivers, straightforward like-for-like swap
What you get
Matches factory amperage, pin count, and footprint exactly; plug-and-play installation with no modification
Heavy-Duty Upgraded Relay
Best for
High-mileage vehicles, modified fuel systems, or harsh climates
What you get
Higher-rated contacts resist heat and corrosion longer than OE; useful if the original relay failed prematurely
Multi-Pack / Value Set
Best for
Fleet vehicles or owners who want a spare on hand
What you get
Two or more relays at a lower per-unit cost; identical spec to OE; good insurance for an older Subaru Forester
OEM Dealer-Sourced Relay
Best for
Owners who want the exact factory part number for warranty or resale purposes
What you get
Brand-new factory unit with guaranteed fitment; typically the highest price but zero guesswork on compatibility

Replacing the fuel pump relay on a Subaru Forester

Easy⏱ 10–20 minutesFuse and relay puller tool or small flathead screwdriverMultimeter or test lightFlashlight or work lightOwner's manual or fuse box diagram

Locate the relay in the fuse box using the cover diagram, use a relay puller or flathead to lever it straight out of its socket, and press the new relay firmly into the same position until it seats fully. No wiring, cutting, or crimping is required — the relay simply unplugs and replugs. Confirm the repair by cycling the ignition to 'on' and listening for the fuel pump prime before attempting to start the engine.

Frequently asked questions

How much does it cost to replace fuel pump relays on a Subaru Forester?
The part itself starts at low prices at AutoBuffy. Because the relay plugs directly into the fuse or relay box, most owners replace it in under 15 minutes with no tools. If a shop does the job, expect a minimal labor charge — typically one flat diagnostic or shop fee since there is almost no disassembly involved.
Can a bad fuel pump relay cause a no-start on a Subaru Forester?
Yes — a failed fuel pump relay is one of the most common causes of a no-start. The relay is the primary power switch for the fuel pump circuit. If it sticks open, the pump never receives voltage and the engine cannot build fuel pressure, so it cranks freely but will not fire regardless of how long you crank it.
How do I test the fuel pump relay on my Subaru Forester before replacing it?
Swap the suspect relay with an identical relay from another circuit in the same fuse box — many vehicles use the same part in multiple locations. You can also use a test light or multimeter to confirm 12V at the relay control coil terminals with the ignition on. A relay tester tool is the most definitive method and costs only a few dollars.
Why does my Subaru Forester start fine when cold but fail to start when hot?
Heat is the most common cause of intermittent fuel pump relay failure. The relay's internal contacts or coil winding can develop a fault that only appears once the component reaches operating temperature. If your Subaru Forester restarts normally after cooling down for 20–30 minutes, a heat-sensitive relay is a strong suspect and should be replaced before diagnosing the pump itself.
Where is the fuel pump relay located on a Subaru Forester?
On most vehicles the fuel pump relay sits in the under-hood fuse and relay box or a secondary fuse block inside the cabin, usually near the driver's footwell. The exact position varies by Forester year and trim. Check the fuse box cover diagram first — it labels each relay position — or consult the owner's manual for the Subaru Forester to locate it without guesswork.
Will a failing fuel pump relay throw a check engine light on a Subaru Forester?
Not always. The fuel pump relay itself is not directly monitored by most OBD-II systems, so it can fail without triggering a diagnostic trouble code. You may see a lean condition code or a fuel system pressure code if the pump runs intermittently, but a completely dead relay often produces a no-start with no codes stored at all.

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