1993 Volvo 940 Fuel Pump Relay: Complete Guide to Symptoms, Location, and Replacement
If your 1993 Volvo 940 cranks but won't start, or stalls unexpectedly after driving, the fuel pump relay is almost certainly the culprit. This is one of the most common failure points on these cars, and the good news is that replacing it is cheap, easy, and can be done in under 15 minutes with no special tools. The fuel pump relay on a 1993 Volvo 940 is located behind the ashtray in the center console, and the replacement part number is typically 3523608 (white relay) or 1362914 (green relay, for earlier models) . Before you start replacing fuel pumps, sensors, or other expensive parts, replace this relay first — it fixes the problem in the vast majority of cases.
Why the Fuel Pump Relay Fails So Often on the 1993 Volvo 940
The fuel pump relay on the Volvo 940 is a known weak point. Over time, the solder joints on the relay's internal circuit board develop cracks from thermal cycling and vibration. This is often called a "dry joint" failure . When the relay gets hot, the cracked solder separates, cutting power to the fuel pump. The car then stalls or refuses to restart until it cools down. Many owners report that tapping the relay with a screwdriver or your hand makes the car start again temporarily — that's a dead giveaway that the relay is bad .
The relay is a wear item, not a lifetime part. Volvo even recommended replacing the fuel pump relay whenever you replace the AMM (Air Mass Meter) or ECU, because a failing relay can send incorrect signals that mimic other problems . If you own a 1993 Volvo 940, keeping a spare relay in your glove box is cheap insurance.
Symptoms of a Bad Fuel Pump Relay on a 1993 Volvo 940
The symptoms of a failing fuel pump relay are very distinct. Here are the most common ones:
1. Car cranks but won't start. The engine turns over fine, but it never fires up. You may not hear the fuel pump prime when you turn the key to position II .
2. Car stalls while driving, then restarts later. The engine dies suddenly with no warning, especially on hot days or after the car has been running for a while. After waiting 10-30 minutes, it starts fine again. This is the classic "hot start" problem .
3. Intermittent no-start condition. The car starts fine for days or weeks, then suddenly refuses to start. It may start again if you wait or if you tap the relay .
4. No fuel pump noise. With the ignition on, you should hear a brief whirring sound from the fuel pump (usually located under the rear seat). If you hear nothing, the relay is not sending power.
5. Fuel pump runs constantly. In some cases, the relay sticks in the "on" position, causing the fuel pump to run even with the engine off. This can drain the battery.
Where Is the Fuel Pump Relay Located on a 1993 Volvo 940?
The main fuel pump relay (also called the fuel injection relay or FI relay) is located in the central electrical panel behind the ashtray in the center console . There is also a second relay — the Radio Suppression Relay (RSR) — located under the hood on the right fender near the coolant reservoir. This relay also controls power to the fuel system in some 1993 models, especially those with the Regina fuel injection system .
To access the main fuel pump relay behind the ashtray:
- Remove the ashtray by pulling it straight out.
- Remove the small cubby hole or trim piece above the ashtray (this makes access much easier) .
- Look for the fuse/relay block. You will see two plastic clips on the sides — push them to release the block .
- Pull the entire block forward. The fuel pump relay is the relay in the middle row, far left position. On some models, it is the relay labeled "E" .
- The relay is typically white (part number 3523608) on 1993 models, but some earlier 940s used a green relay (part number 1362914) .
For the Radio Suppression Relay under the hood:
Open the hood and look on the right side (passenger side) near the coolant expansion tank. The RSR is a small relay mounted on the inner fender. It has a 4-pin connector. On 1993 models with Regina fuel injection, this relay is critical for fuel pump operation .
How to Test the Fuel Pump Relay on a 1993 Volvo 940
Before buying a new relay, you can test the existing one. Here is a simple method:
1. Listen for the relay click. With the ignition off, have someone turn the key to position II. You should hear a distinct click from the relay in the center console. If you hear no click, the relay coil is likely dead.
2. Bypass the relay. Pull the relay out. Look at the pin numbers on the relay socket. On a standard 6-pin relay, terminals 30 and 87/2 supply power to the fuel pump. Using a short piece of wire or a paper clip, jumper terminals 30 and 87/2. If the fuel pumps turn on (you'll hear them), the relay is bad . Do not leave the jumper in place for more than a few seconds, as it bypasses all safety circuits.
3. Check for voltage. With the relay removed and the ignition on, use a multimeter to check for 12V on terminal 30 (constant power) and terminal 86 (switched power from the ignition). If you have power but no click, the relay is faulty.
4. Inspect the solder joints. Pop the plastic cover off the relay. Look at the circuit board for cracked or cold solder joints around the relay coil pins. Re-soldering these joints can sometimes fix the relay for free .
How to Replace the Fuel Pump Relay on a 1993 Volvo 940
Replacing the fuel pump relay is the easiest repair you can do on a Volvo 940. Here is the step-by-step process:
What you need:
- New fuel pump relay (part number 3523608 for 1993 models, or 1362914 for some earlier versions)
- Small flathead screwdriver (optional, for prying)
Step 1: Remove the ashtray. Pull the ashtray straight out of the center console. Set it aside.
Step 2: Remove the cubby hole. Above the ashtray is a small storage cubby. Pull it out — it may have a screw on the left side that needs to be removed .
Step 3: Release the fuse/relay block. There are two plastic spring clips, one on each side of the fuse block. Pinch them or pull them outward to release the block. The entire block will slide forward .
Step 4: Locate the fuel pump relay. It is the relay in the middle row, far left position. On some panels, it is labeled "E." It is usually white (part 3523608) on 1993 models .
Step 5: Pull out the old relay. Grasp the relay firmly and pull straight out. It may require a little wiggling. If it is stuck, use a small screwdriver to gently pry it up.
Step 6: Plug in the new relay. Align the pins and press firmly until it clicks into place. Make sure it is fully seated.
Step 7: Reassemble. Push the fuse block back into place, ensuring the clips engage. Reinstall the cubby hole and the ashtray.
Step 8: Test. Turn the ignition to position II. You should hear the fuel pump prime for about 1-2 seconds. Start the car.
1993 Volvo 940 Fuel Pump Relay: White vs. Green
There is some confusion about whether the relay should be white or green. For a 1993 model year Volvo 940, the correct relay is the white relay, part number 3523608 . This relay has 6 pins and is rated for 15A at 12V . The green relay (part number 1362914) was used on earlier models, such as the 1988-1990 Volvo 760 and some 1991 940s . If you have a 1993, stick with the white relay (3523608). However, both relays serve the same function and are interchangeable in many cases, as long as the pin configuration matches.
Other Components That Can Cause Similar Symptoms
If replacing the fuel pump relay does not fix your problem, there are a few other components to check:
1. Radio Suppression Relay (RSR). Located under the hood on the right fender, this relay provides power to the fuel injectors and fuel pump on models with Regina fuel injection. If it fails, the car will crank but not start, even with a good main relay .
2. Crank Position Sensor (CPS). A failing CPS can cause intermittent no-start conditions, especially when hot. The CPS is located on the front of the engine, near the crankshaft pulley. It is a common failure point on 1993 940s .
3. Fuel Pump. If the relay is good and you have power to the pump, but the pump does not run, the pump itself may be bad. The fuel pump on a 1993 Volvo 940 is located inside the fuel tank, accessible under the rear seat .
4. Fuel Pump Fuse. Check fuse #1 in the fuse box. This fuse powers the entire EFI system. If it is blown, the car will not start .
Recommended Replacement Part: KEMSO Fuel Pump
If you have determined that the fuel pump relay is not the issue and the actual fuel pump needs replacement, do not settle for cheap, unreliable parts. The fuel pump is a critical component, and a failure on the road can leave you stranded.
KEMSO offers high-performance fuel pumps that are direct OEM replacements for the 1993 Volvo 940. Every KEMSO fuel pump is built to meet or exceed factory specifications, ensuring perfect fitment and reliable operation. Unlike many aftermarket pumps that fail within months, KEMSO pumps are engineered for durability and backed by a lifetime warranty. If your KEMSO fuel pump ever fails, they will replace it — no questions asked. That is the kind of peace of mind you want when you are driving a classic Volvo.
Visit the KEMSO website to find the exact replacement pump for your 1993 Volvo 940: https://www.kemsoracing.com/
Final Thoughts
The 1993 Volvo 940 is a reliable, well-built car, but the fuel pump relay is its Achilles' heel. If you experience intermittent starting issues, stalling, or a no-start condition, start with the relay. It costs around $20, takes 10 minutes to replace, and fixes the problem in the vast majority of cases. Keep a spare in your glove box — you will be glad you did when it fails on a hot summer day.
For more information on Volvo 940 fuel pump relay replacement, or to order a high-quality replacement fuel pump, visit https://www.kemsoracing.com/.