2004 Pontiac Grand Am Fuel Pump Relay Location: Complete Guide to Finding, Testing, and Replacing It
The fuel pump relay on a 2004 Pontiac Grand Am is located inside the under-hood fuse box (also called the underhood electrical center or relay center), mounted on the driver’s side near the strut tower. This fuse box sits right next to the engine air cleaner housing. If your Grand Am cranks but refuses to start, or you hear no hum from the fuel tank area when you turn the key to the “ON” position, the fuel pump relay is one of the first components you should check. This guide walks you through exactly where to find it, how to test it, what symptoms point to a bad relay, and how to replace it yourself.
Where Exactly Is the Fuel Pump Relay Located?
The under-hood fuse box on the 2004 Pontiac Grand Am is a black plastic rectangular box. It sits on the driver’s side of the engine compartment, right behind the headlight assembly and next to the battery or the air cleaner box depending on your engine version (2.2L Ecotec or 3.4L V6) .
Open the fuse box lid. On the underside of the lid, there is a diagram showing the position and function of every relay and fuse inside. The fuel pump relay is typically labeled as “FUEL PUMP” or “FUEL PUMP RELAY” on this diagram. In most 2004 Grand Am models, the fuel pump relay is a standard four-pin or five-pin relay. It is often located in the same row as other major relays like the ignition relay and the engine control module (ECM) relay .
If the diagram on the lid is missing or unreadable, consult your owner’s manual. The manual contains a full map of the under-hood fuse box. Alternatively, you can search online for the specific fuse box layout for your Grand Am’s engine (either the 2.2L or the 3.4L) .
Tip: The fuel pump relay in the 2004 Grand Am looks identical to several other relays in the same box. They are usually dark gray or black, about one inch square. Before you remove anything, take a photo of the fuse box layout with your phone so you know exactly where each relay went.
How Does the Fuel Pump Relay Work?
The fuel pump relay is an electrical switch controlled by the powertrain control module (PCM). When you turn your ignition key to the “ON” position, the PCM sends a ground signal to the relay. This closes the internal switch inside the relay, sending 12 volts of battery power to the fuel pump. The pump then pressurizes the fuel rail so the engine can start. Once the engine is running, the PCM keeps the relay energized as long as it detects a crankshaft position signal. If the engine stalls or stops turning, the PCM de-energizes the relay to shut off the fuel pump .
3 Common Symptoms of a Bad Fuel Pump Relay
1. Engine Cranks but Won’t Start
This is the most classic symptom. You turn the key, the starter motor spins the engine normally, but the engine never fires up. You do not hear the usual two-second whirring sound from the fuel pump when you turn the key to the “ON” position. The fuel pump relay is not sending power, so the pump cannot build fuel pressure .
2. Intermittent Stalling or No-Start
A failing relay may work sometimes and fail others. You might drive the car for 20 minutes, then it suddenly dies and refuses to restart. After cooling down for a while, it may start again. This on-and-off behavior strongly points to a relay with worn-out internal contacts or a broken coil .
3. No Fuel Pump Prime (Silent Fuel Tank)
Normally, when you turn the key to the “ON” position (without cranking), you should hear a brief hum from the rear of the car where the fuel tank is. If you hear nothing, and the engine cranks but does not start, suspect the relay first. However, this symptom can also point to a blown fuel pump fuse, a dead fuel pump, or a faulty PCM. The relay is the easiest and cheapest place to start .
Step-by-Step Guide to Test the Fuel Pump Relay
Testing the fuel pump relay on a 2004 Grand Am is simple and requires only a multimeter (or sometimes just another relay from the same fuse box).
What you need:
- A digital multimeter or a test light.
- A small flathead screwdriver or relay puller.
- (Optional) A known-good relay from the same fuse box.
Step 1: Locate and remove the relay.
Open the under-hood fuse box. Find the fuel pump relay using the diagram on the lid. Gently rock the relay side to side and pull it straight out.
Step 2: Visually inspect the relay.
Check the metal terminals. They should be clean and free of corrosion. If they are rusty or burned, the relay may have overheated and failed.
Step 3: Perform the “swap test.”
This is the quickest test. Find another relay in the same fuse box that is identical to the fuel pump relay (for example, the horn relay or the A/C clutch relay often share the same part number). Swap that relay into the fuel pump relay position. Replace the fuel pump relay lid and try to start the car. If the car starts now, your original fuel pump relay is bad .
Step 4: Perform the multimeter continuity test.
Set your multimeter to measure resistance (ohms). Touch the probes to terminals 85 and 86 on the relay (these are the coil terminals). You should see a reading between 50 and 120 ohms. If you see infinite resistance (OL), the relay coil is broken and the relay is dead. Then, connect a 12-volt battery to terminals 85 and 86 (briefly). You should hear an audible click, and you should measure near-zero resistance between terminals 30 and 87 (the switch terminals). If the relay clicks but the switch does not close, or if the relay does not click at all, it is faulty .
How to Replace the Fuel Pump Relay
Replacing the fuel pump relay on a 2004 Pontiac Grand Am is a straightforward DIY job that takes less than 15 minutes.
Step 1: Buy the correct replacement relay.
Take your old relay to an auto parts store (like AutoZone, O’Reilly, or Advance Auto Parts) and ask for a matching relay. You can also look up the part number on the relay itself. Common relay numbers include Denso 056700-7510 or Bosch 0332019155. Many stores sell universal relays that will work. Do not use a relay with a different amperage rating .
Step 2: Disconnect the battery (optional but recommended).
For safety, disconnect the negative battery terminal. This prevents accidental shorts or sparks while working in the fuse box.
Step 3: Remove the old relay.
Use your fingers or a relay puller to pull the old relay straight out of its socket. Do not pry on the relay with a metal tool, as you may damage the plastic socket.
Step 4: Install the new relay.
Align the relay’s pins with the socket and push it straight down firmly. You should feel it click into place. Ensure it sits flush with the fuse box.
Step 5: Reconnect the battery and test.
Reconnect the battery. Turn the key to the “ON” position and listen for the fuel pump prime sound. Try starting the engine. If it starts normally, the repair is complete .
Other Possible Causes of No Power to the Fuel Pump
If you replace the relay and the car still does not start, here are additional components to check:
Fuel pump fuse: Check the fuel pump fuse (usually a 15- or 20-amp fuse) in the same under-hood fuse box. If it is blown, replace it. If it blows again immediately, there is a short in the fuel pump circuit .
Fuel pump inertia switch: On some 2004 Grand Am models, there is an inertia (impact) switch located behind the glove box or in the passenger footwell. If this switch is tripped, it cuts power to the fuel pump. Press the reset button on top of the switch.
Fuel pump itself: The fuel pump inside the gas tank may have failed. This is less common than a relay failure but happens with age and mileage. You can check for voltage at the fuel pump connector using a multimeter while a helper turns the key to “ON.”
PCM (powertrain control module): A failed PCM or a wiring issue between the PCM and the relay can prevent the relay from being energized. This is rare but possible .
Preventive Tips for Your 2004 Grand Am Fuel System
Keep the fuel tank at least a quarter full. Running low on fuel frequently can overheat the electric fuel pump because the fuel in the tank acts as a coolant. A hot fuel pump draws more current, which stresses the relay .
Replace the fuel filter. A clogged fuel filter forces the pump to work harder, increasing the load on the relay. On a 2004 Grand Am, the fuel filter is located along the frame rail near the driver’s side rear wheel. Replace it every 30,000 miles.
Listen for the prime sound. Every time you turn the key to “ON” before starting, listen for the two-second hum from the fuel tank. If you ever stop hearing it, check the relay immediately before the car leaves you stranded.
Carry a spare relay. Fuel pump relays are small and cheap (usually under $15). Keep a spare in your glove compartment along with a simple fuse puller. If the relay fails on the road, you can swap it yourself in a parking lot and be on your way within five minutes .
Why Choose KEMSO for Your Fuel Pump Replacement
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