PRODUCT DETAILS
Honda Post 2003 Fuel Pump Relay - 39794-SDA-004
Your Honda or Acura cranking but not starting? Fuel pump not priming when you turn the key? Your fuel pump relay's probably dead. Part number 39794-SDA-004. This is the OEM relay that powers your fuel pump. When you turn your key to the on position, you should hear your fuel pump prime for a couple seconds. If you don't hear it, your fuel pump relay's not sending power. Your fuel pump's not running, you're not building fuel pressure, and your car's not starting.
Here's How You Know It's the Relay
Fuel pump relay failure's super common on Hondas and Acuras. The relay's buried under your dash or in your under-hood fuse box. Eventually the contacts inside corrode or weld together and the relay quits. If your car's cranking strong but not starting, pop your hood and listen for the fuel pump prime when you turn the key on. No humming sound from your fuel tank means your fuel pump's not running. Could be the pump itself, but it's usually the relay. Relays fail way more often than fuel pumps. Swap the relay first before you drop $300 on a fuel pump you don't need.
Way Cheaper Than a Fuel Pump
Most people assume their fuel pump's dead and start tearing into the tank. Check the relay first. Swap it with a known good relay from another spot in your fuse box (most Hondas use the same relay for multiple circuits) and see if your car starts. If it fires up with the swapped relay, you just saved yourself a fuel pump replacement. Buy a fresh relay and call it a day.
Fits a Massive Range of Hondas and Acuras
This relay fits pretty much every Honda and Acura from 2003 onwards. If you've got a Honda or Acura from the last 20 years, there's a good chance this is your fuel pump relay. Check your owner's manual or fuse box diagram to confirm, but this part number covers a huge range of models.
What You Get
- Honda OEM fuel pump relay (part number 39794-SDA-004)
- Powers fuel pump when ignition is on
- Direct replacement for factory relay
- Same relay your car came with from the factory
Fits Your Car
- 2013-2022 Acura ILX
- 2023-2026 Acura Integra
- 2007-2020 Acura MDX
- 2017-2021 Acura NSX
- 2007-2018 Acura RDX
- 2005-2012 Acura RL
- 2014-2020 Acura RLX
- 2004-2014 Acura TL
- 2015-2020 Acura TLX
- 2004-2014 Acura TSX
- 2010-2013 Acura ZDX
- 2003-2025 Honda Accord
- 2006-2026 Honda Civic DX/EX/LX/Si/Type R
- 2007-2026 Honda CR-V
- 2011-2016 Honda CR-Z
- 2010-2015 Honda Crosstour
- 2007-2020 Honda Fit
- 2016-2026 Honda HR-V
- 2010-2014 Honda Insight
- 2019-2022 Honda Insight
- 2005-2017 Honda Odyssey
- 2019-2025 Honda Passport
- 2009-2022 Honda Pilot
- 2026 Honda Prelude
- 2006-2026 Honda Ridgeline
Note: The relay's location varies by model. Check your owner's manual or fuse box diagram. On most Hondas, it's either under the dash near the driver's side or in the under-hood fuse box. The relay's labeled "FUEL PUMP" or "PGM-FI MAIN" depending on your model. Pull the old relay straight out, push the new one straight in. It only goes in one way. Before you buy a relay, try swapping your fuel pump relay with another relay in your fuse box that's the same type. Most Hondas use the same relay for multiple circuits. If your car starts with a swapped relay, you know the relay's bad. If it still doesn't start with a known good relay, you've got a different problem, which could be the fuel pump itself, fuel pump fuse, wiring, or something else entirely. But start with the relay. It's the cheapest and easiest thing to check.