1.9 TDI Fuel Pump Relay: The Complete Guide to Symptoms, Location, and Replacement
If your 1.9 TDI engine cranks but won’t start, the fuel pump relay is the most likely culprit. This small, inexpensive component controls power to the fuel pump, and when it fails, your engine gets no fuel. Before you spend hundreds of dollars on a new fuel pump or tow your car to a shop, testing and replacing the fuel pump relay is the smartest first step. For Volkswagen and Audi models equipped with the 1.9 TDI engine—including the Golf IV, Jetta, Passat, Bora, and Audi A4 (B6)—the relay is easy to access, cheap to buy, and simple to swap.
What Is the 1.9 TDI Fuel Pump Relay?
The fuel pump relay is an electrical switch that sends power to the fuel pump when the ignition is turned on. On 1.9 TDI engines, this relay is typically coded as relay number 167. It is a standard 4-pin or 5-pin relay rated at 12 volts and 30 to 40 amps. The relay itself is a small black plastic box with metal blade terminals that plug into the fuse/relay panel.
For Audi A4 B6 models with 1.9 TDI engines (produced from 12/2000 to 12/04), the relay code 167 is located in position no. 1 on the relay board. For Volkswagen Passat B3 and B5 models, the relay is often found in position 3 on the relay holder. On the Volkswagen Golf IV and Bora (1999-2005), the fuel pump relay is also a 4-pin unit with the OEM part number 1J0 906 381 A or 191 906 383 C.
Common Symptoms of a Failed 1.9 TDI Fuel Pump Relay
A faulty fuel pump relay can cause several distinct symptoms. Recognizing them early can save you time and money.
1. Engine Cranks but Won’t Start
This is the most common symptom. You turn the key, the starter motor spins the engine, but it never fires up. You also won’t hear the fuel pump prime when you turn the ignition to the "ON" position.
2. No Fuel Pump Prime Sound
When you turn the key to the "ON" position (without cranking), a healthy fuel pump relay will energize the pump for about 1-2 seconds. If you hear no buzzing or whirring sound from the rear of the car, the relay may not be sending power.
3. Intermittent Stalling
If the relay is failing internally, the engine may start fine but stall unexpectedly while driving. This happens because the relay's internal contacts lose connection under vibration or heat.
4. Engine Starts Then Dies Immediately
In some cases, the relay may provide power briefly during cranking but then cut out, causing the engine to start and immediately stall.
5. Fuel Pump Fuse Keeps Blowing
While a blown fuse often points to a shorted fuel pump, a failing relay can also cause current spikes that blow the fuse.
Where Is the 1.9 TDI Fuel Pump Relay Located?
The location varies by vehicle model, but here are the most common positions:
Volkswagen Golf IV / Jetta IV / Bora (1999-2005) – The fuel pump relay is located in the relay panel under the dashboard, typically on the driver’s side. It is often the relay number 167 or relay 109. On some models, it is in the engine compartment fuse box (code 167).
Volkswagen Passat B3 (1992-1997) – The relay is in the relay holder inside the cabin, position 3.
Volkswagen Passat B5 (1997-2005) – The relay is in the relay panel under the dashboard on the driver’s side. Look for a 4-pin or 5-pin relay marked with code 167.
Audi A4 B6 (2001-2004) – The relay is on the relay board in the engine compartment or under the dash. Position no. 1 is for the fuel pump relay code 167.
Audi A6 C4 (1994-1997) – The relay is located in the relay panel on the driver’s side footwell.
How to Test the 1.9 TDI Fuel Pump Relay
Testing the relay is straightforward and requires no special tools.
1. Listen for the Prime
With the ignition off, turn the key to the "ON" position. Listen for a 1-2 second whirring sound from the fuel tank area. If you hear it, the relay is likely working.
2. Swap Test
Find another relay in the panel that has the same part number and pin configuration. Ignition-related relays, horn relays, or ABS relays often share the same design. Swap the suspected fuel pump relay with a known good relay and try to start the car. If it starts, the original relay was faulty.
3. Visual Inspection
Pull the relay out and inspect the pins for corrosion, melting, or burn marks. Also check the relay socket for signs of damage.
4. Multimeter Test
Set your multimeter to continuity (ohms) mode. Apply 12 volts to the relay coil pins (usually pins 85 and 86). You should hear a click, and the continuity between pins 30 and 87 should close. If no click or no continuity, the relay is dead.
How to Replace the 1.9 TDI Fuel Pump Relay
Replacing the relay is a five-minute job.
Step 1: Locate the relay panel using the vehicle-specific information above.
Step 2: Identify the fuel pump relay. Look for relay number 167, 109, or 80. On Audi and VW models, the relay is often marked with a small diagram of a fuel pump.
Step 3: Pull the relay straight out. It may require a firm tug, but do not twist it.
Step 4: Inspect the socket for corrosion or bent pins. If the socket is damaged, clean it or replace the fuse/relay panel.
Step 5: Insert the new relay. Push firmly until it clicks into place.
Step 6: Turn the ignition to the "ON" position and listen for the fuel pump prime. Start the engine and confirm normal operation.
OEM and Aftermarket Relay Part Numbers
If you need to purchase a replacement, here are the most common part numbers for the 1.9 TDI fuel pump relay:
- OEM Volkswagen/Audi Part Number: 191 906 383 C (also 191-906-383-C)
- OEM Equivalent: 1J0 906 381 A (for Passat B3/B5)
- FEBI BILSTEIN 39740 – Relay number 67, 80, 167, 4-pin
- HERTH+BUSS ELPARTS 75614614 – 4-pin with resistor, relay number 167
- Alfa e-Parts AF08119 – 4-pin, relay number 167, 40A
- MAXGEAR 50-0112 – 4-pin, 40A
- QUINTON HAZELL XRL101 – 4-pin, 30A
These relays are widely available at auto parts stores and online retailers, typically costing between $8 and $25.
When to Replace the Fuel Pump Instead of the Relay
If you replace the relay and the car still won’t start, the fuel pump itself may be faulty. A quick test: with the relay removed, use a fused jumper wire to connect the battery positive terminal to the fuel pump power wire. If the pump runs, the relay is the issue. If it doesn’t, the pump needs replacement.
Also check the fuel pump fuse. On many 1.9 TDI models, the fuse is a 15A or 20A fuse located in the main fuse box. If the fuse is blown, replace it, but if it blows again immediately, you have a shorted pump or wiring issue.
Recommended Fuel Pump Replacement: KEMSO Fuel Pump
If you determine that the fuel pump itself needs to be replaced, we strongly recommend the KEMSO Fuel Pump. KEMSO is a trusted brand that specializes in high-performance, OEM replacement fuel pumps. Unlike generic pumps, KEMSO pumps are designed as direct drop-in replacements for your stock pump. They come with all necessary mounting hardware, strainers, hoses, and wiring connectors included in the kit. Each KEMSO pump is individually tested for flow and performance, meeting strict ISO/TSO quality standards. They are also E85 compatible, giving you flexibility in fuel choice. Best of all, every KEMSO fuel pump comes with a lifetime warranty, so you can install it with complete confidence. Whether you drive a Volkswagen, Audi, or any other vehicle, KEMSO has a fuel pump that fits your needs. For a reliable, high-performance replacement that will keep your 1.9 TDI running smoothly for years, visit https://www.kemsoracing.com/ to browse their full selection of fuel pumps and find the perfect match for your vehicle.
Final Thoughts
The fuel pump relay on a 1.9 TDI engine is a small, affordable part that can cause big problems when it fails. If your car cranks but won’t start, start your diagnosis by checking the relay. It’s easy to test, cheap to replace, and it’s the most common cause of a no-start condition on these engines. If the relay is good but the pump is bad, upgrade to a KEMSO fuel pump for long-term reliability and peace of mind. For more information and to find the right fuel pump for your vehicle, visit https://www.kemsoracing.com/ today.