1999 Saab 9-3 Fuel Pump Relay Location: Complete Guide for DIY Owners

The fuel pump relay on a 1999 Saab 9-3 is located inside the main fuse box under the hood, on the driver‘s side near the strut tower. If your Saab cranks but won’t start, the fuel pump relay is one of the first things you should check.

Understanding the Fuel Pump Relay and Its Role

The fuel pump relay acts as an electrical switch that controls power to the fuel pump. When you turn the ignition key, the relay closes and sends battery voltage to the fuel pump, allowing it to pressurize the fuel system. On the 1999 Saab 9-3, this relay is part of a larger system that includes the fuel pump fuse, the fuel pump itself, and the engine control module (ECM) that triggers the relay .

If the relay fails, the fuel pump won‘t receive power, and your engine will crank but never fire up. This is a common issue on Saab 9-3 models from 1998 to 2003 .

Exact Location of the Fuel Pump Relay

Main fuse box location: The central fuse and relay box for the 1999 Saab 9-3 is located under the hood on the driver’s side, mounted near the suspension strut tower . It is a black plastic box with a lid that clips on.

Identifying the relay: Inside this fuse box, the fuel pump relay is typically labeled as “Fuel Pump” or “FP” on the underside of the lid. The relay itself is a square, black component with four or five pins. On the 1999 Saab 9-3, it is usually positioned in the middle row of relays .

Relay identification tips:

  • Look for markings: The relay cover often has a small diagram or text indicating which relay is for the fuel pump .
  • Check the owner’s manual: If you have the original owner’s manual, it will show the exact position of the fuel pump relay.
  • Use a test light: If you’re unsure, you can test each relay by listening for a click when someone turns the key to the “ON” position. The fuel pump relay should click for about two seconds when the ignition is first turned on .

How to Test the Fuel Pump Relay

Before replacing the relay, you can test it with a simple multimeter or a test light:

Step 1: Locate the relay – Find the fuel pump relay in the main fuse box under the hood .

Step 2: Check for power – With the ignition key in the “ON” position, use a test light to check for 12 volts at the relay’s power terminals. You should see voltage on at least one terminal .

Step 3: Listen for the click – Have someone turn the ignition to “ON” while you listen near the relay. A healthy relay makes a distinct clicking sound as it engages .

Step 4: Swap the relay – If you suspect the relay is bad, swap it with a known-good relay of the same type found in the fuse box (like the horn relay or the AC relay). If the engine starts after the swap, the original relay is faulty .

Common Symptoms of a Bad Fuel Pump Relay

If your 1999 Saab 9-3 has a failing fuel pump relay, you may notice these symptoms:

1. Engine cranks but won’t start – This is the most common symptom. The starter motor turns the engine over, but the fuel pump never gets power, so no fuel reaches the injectors .

2. Intermittent starting issues – The car may start fine one day and refuse to start the next. This happens because the relay contacts wear out and make inconsistent connections .

3. No fuel pump prime sound – When you turn the key to the “ON” position, you should hear a brief whirring sound from the fuel pump near the rear of the car. If you don’t hear this, the relay or the pump itself may be dead .

4. Engine stalls while driving – A failing relay can lose connection while the engine is running, causing the fuel pump to shut off and the car to stall unexpectedly .

Other Possible Causes of a No-Start Condition

If the fuel pump relay checks out fine, consider these other components:

Fuel pump fuse: The fuel pump fuse is usually located in the same fuse box as the relay. Check the fuse box diagram on the lid to find the correct fuse. A blown fuse will cut power to the fuel pump just like a bad relay .

Fuel pump itself: The fuel pump on the 1999 Saab 9-3 is located inside the fuel tank. If the relay and fuse are good, but you still don’t hear the pump prime, the pump may have failed. Testing fuel pump pressure at the fuel rail is the next step .

Crank position sensor: On Saab 9-3 models, a failing crankshaft position sensor can also cause a no-start condition. This sensor tells the ECM when to fire the injectors and spark plugs. If it fails, the engine will crank but not start .

Ignition switch or security system: A faulty ignition switch or a triggered immobilizer can prevent the fuel pump relay from engaging. If your dash shows a security light flashing, the car may be in anti-theft mode .

Step-by-Step Relay Replacement Guide

Replacing the fuel pump relay on a 1999 Saab 9-3 is a straightforward job that takes about 10 minutes:

Tools needed:

  • Replacement relay (standard 4-pin or 5-pin relay, depending on your model)
  • Needle-nose pliers (optional, for gripping the relay)
  • Test light or multimeter (for verification)

Procedure:

  1. Park the car on a level surface and turn off the ignition. Let the engine cool if it has been running.
  2. Open the hood and locate the main fuse box on the driver’s side, near the strut tower .
  3. Remove the fuse box lid by pressing the clips on the sides and lifting it off.
  4. Find the fuel pump relay – Look for the label on the underside of the lid or check the diagram printed on the box. The relay is usually a square, black component .
  5. Pull the old relay out – Grasp the relay firmly and pull it straight up. It may require a little force, but it should come out without tools.
  6. Insert the new relay – Push the new relay straight down into the same socket. Make sure it seats fully.
  7. Replace the fuse box lid and close the hood.
  8. Test the car – Turn the key to the “ON” position and listen for the fuel pump prime sound. Then start the engine. If it fires up, the job is done.

Where to Buy a Replacement Fuel Pump Relay

You can find replacement fuel pump relays for your 1999 Saab 9-3 at:

  • Auto parts stores: Local stores like AutoZone, O’Reilly, or Advance Auto Parts carry generic relays that fit Saab vehicles. Bring the old relay with you to match the pin configuration.
  • Online retailers: Amazon, eBay, and Saab specialty parts websites sell OEM and aftermarket relays.
  • Junkyards: If you have local salvage yards, you can pull a relay from a similar Saab 9-3 (1998-2003) for a few dollars.

Recommended: KEMSO Fuel Pump for Your Saab 9-3

If you discover that your fuel pump itself has failed, rather than just the relay, you should consider a high-quality replacement. The KEMSO brand offers high-performance, OEM-replacement fuel pumps that are engineered to meet or exceed factory specifications. Each KEMSO fuel pump is built with premium materials for long-lasting durability, and they come with a lifetime warranty for your peace of mind.

KEMSO’s fuel pumps are designed for easy installation and reliable performance, making them an excellent choice for your 1999 Saab 9-3. Whether you need a direct OE replacement or an upgrade for better fuel delivery, KEMSO has you covered. Visit their website to browse their full range of fuel pump products and find the right fit for your vehicle.

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Final Thoughts

The fuel pump relay location on a 1999 Saab 9-3 is in the main fuse box under the hood, on the driver’s side near the strut tower. It is one of the easiest components to check when your engine cranks but won’t start. Before diving into more expensive repairs like replacing the fuel pump, always test the relay and the fuse first. A simple relay swap can save you time, money, and frustration.

If you’re unsure about any step, consult your vehicle’s service manual or ask a professional mechanic. Working with electrical components requires caution, so always disconnect the battery before handling fuses and relays.

For high-quality fuel pump replacements, remember to check out KEMSO Racing at https://www.kemsoracing.com/ for performance-driven, lifetime-warranty fuel pumps.


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