2007 Harley Davidson Fuel Pump Relay: Complete Guide to Location, Testing, and Replacement

The bottom line up front: If your 2007 Harley-Davidson cranks but won't start, loses power while riding, or stalls unexpectedly, the fuel pump relay is one of the first components you should check before spending money on a new fuel pump. The relay is a small electrical switch that controls power delivery to the fuel pump, and when it fails, your bike's engine won't get the fuel pressure it needs to run. This guide walks you through where the relay is located, how to test it with basic tools, and how to replace it yourself in under an hour.

What Does the Fuel Pump Relay Do?

Every fuel-injected Harley-Davidson built after 2002 uses an electric fuel pump mounted inside the fuel tank to pressurize the fuel system. The fuel pump relay acts as the middleman between the motorcycle's battery and the fuel pump itself. When you turn the ignition key to the "on" position, the engine control module (ECM) sends a small electrical signal that closes the relay's contacts, allowing full battery current to flow to the fuel pump. This is how the pump pressurizes the fuel lines before you hit the starter button.

A healthy relay clicks once when you turn the key on, and you should hear the fuel pump whir for about two seconds as it builds pressure. If you don't hear that prime cycle, the relay may be stuck open, meaning no power reaches the pump. A relay can also fail in the closed position, which keeps the pump running even after the engine shuts off—a serious safety hazard that can drain your battery overnight.

Symptoms of a Bad Fuel Pump Relay on a 2007 Harley

Because the relay and the fuel pump share the same electrical circuit, their failure symptoms overlap significantly. Here are the six most common signs that point specifically to a faulty relay rather than a dead pump:

1. Engine cranks but won't start – The starter motor turns the engine over normally, but there's no fuel pressure, so the engine never fires. This is the single most common symptom of a bad relay.

2. No fuel pump prime sound – When you turn the key to "on," you should hear a brief whirring noise from the fuel tank area. If this is absent, the relay isn't sending power to the pump.

3. Intermittent starting – The bike starts fine sometimes but refuses to start other times. This usually points to a relay with worn or burned internal contacts that make an inconsistent connection.

4. Engine dies while riding – The engine suddenly cuts out mid-ride, then restarts after cooling down or waiting a few minutes. This happens when the relay overheats and opens the circuit temporarily.

5. No relay clicking sound – When you turn the key on, a healthy relay makes an audible click. If you hear nothing, the relay coil may be burned out.

6. Fuel pump runs continuously – If the relay sticks in the closed position, the pump runs nonstop even with the key off, which drains the battery quickly and can flood the engine.

Keep in mind that some of these symptoms—especially the "cranks but won't start" scenario—can also be caused by a failed fuel pump, a blown fuse, or a bad crank position sensor. That's why testing the relay first is the smart approach: it's cheap and easy to rule out before you pull the fuel tank apart.

Where Is the Fuel Pump Relay Located on a 2007 Harley-Davidson?

The exact location of the fuel pump relay depends on which 2007 Harley-Davidson model you own. In 2007, Harley produced several distinct families: the Touring models (Road King, Electra Glide, Road Glide), the Dyna Glide models, the Softail models, the Sportster models, and the VRSC (V-Rod) models. The relay location varies across these model lines.

On Touring models (Road King, Street Glide, Electra Glide, Road Glide), the main fuse box and relay block sit under the left side cover, just below the seat. You'll need to remove the left saddlebag to access it on some models. The fuel pump relay is a small black cube labeled with a diagram on the fuse box cover—look for the relay position marked "Fuel Pump" or with a fuel pump symbol.

On Dyna Glide models, the relays are located in a similar position behind the left side cover. On some 2007 Dyna models, the relay block is mounted near the battery, behind the left rear side panel. Remove the seat and the side cover to gain clear access.

On Softail models, the main fuse and relay box sits under the seat near the battery. You'll need to remove the seat (usually a single bolt or a key-operated latch) to see the relay block. The fuel pump relay is typically the unit closest to the battery positive terminal.

On Sportster models (883 and 1200), the fuse box and relay are located under the left side cover, which is held in place by two rubber grommets. Pull the cover off gently to reveal the relays.

On VRSC V-Rod models, the relay block is positioned under the left side panel near the radiator. The 2007–2008 V-Rod uses a fuel pump relay that shares the same electrical layout as the other 2007 models but sits in a different physical location due to the unique frame design.

If you're uncertain, consult your owner's manual. Harley prints a diagram of the relay positions on the inside of the fuse box cover, which takes the guesswork out of the process.

How to Test the Fuel Pump Relay

Before you spend money on a replacement, take ten minutes to test the relay with a multimeter. The process is straightforward and requires no special tools beyond a digital multimeter (set to measure resistance and continuity) and a 12V power source like a motorcycle battery or a bench power supply.

Step 1: Locate and remove the relay. With the battery disconnected, remove the relay from the fuse box by pulling it straight upward. The relay has either four or five prongs on the bottom. The common configuration is 30 (common), 85 (coil negative), 86 (coil positive), and 87 (normally open contact). If it has a fifth prong, it's labeled 87a (normally closed contact).

Step 2: Test the coil. Set your multimeter to the resistance (ohms) setting. Touch one probe to pin 85 and the other to pin 86. A good relay coil will read between 50 and 200 ohms. An infinite reading (OL on the display) means the coil is open and the relay is dead.

Step 3: Test the contact in the rest position. With the relay removed and no power applied, check resistance between pin 30 and pin 87. A normally open relay should read infinite resistance (no continuity) in this state. If you get a reading of zero, the contacts are stuck closed.

Step 4: Apply power to the coil. Connect 12V to pin 86 and ground to pin 85. You should hear an audible click as the relay energizes. With power still applied, check resistance between pin 30 and pin 87 again. Now you should read near zero ohms (continuity), which means the contacts have closed.

Step 5: Judge the results. If the relay clicks and shows continuity when energized, it's working correctly, and your problem lies elsewhere—check the fuel pump itself, the fuse, and the wiring harness. If the relay fails any of these tests, replace it with a new one.

How to Replace the Fuel Pump Relay

Replacing a fuel pump relay on a 2007 Harley-Davidson takes about fifteen minutes and requires no special mechanical skill. Here's the step-by-step process:

Step 1: Park the bike on a level surface and turn the ignition off. Wait at least ten minutes for the fuel system to depressurize. While waiting, disconnect the negative battery cable to prevent any electrical shorts.

Step 2: Remove the seat. Depending on your model, this involves either loosening a 5/16-inch bolt at the rear of the seat or using the key-operated seat latch. Lift the seat up and pull it rearward to remove it.

Step 3: Remove the side cover. On Touring and Dyna models, the left side cover pops off by pulling it outward—it's held by rubber grommets. On Softail and Sportster models, the fuse box may be visible once the seat is removed.

Step 4: Identify the fuel pump relay. Look for a small cube relay (approximately 1 inch square) with a wiring harness connected to it. Consult the diagram on the fuse box cover or the owner's manual if you're unsure which relay controls the fuel pump.

Step 5: Disconnect the wiring harness and pull the relay out. Some relays have a locking tab that you need to press down while pulling the connector off. Pull the relay straight up to remove it from the socket.

Step 6: Install the new relay. Push the new relay firmly into the socket until it seats completely. Reconnect the wiring harness, making sure the connector clicks into place.

Step 7: Reinstall the side cover and seat. Reverse the removal steps. Reconnect the battery cable last.

Step 8: Test the system. Turn the ignition key to the "on" position without starting the engine. You should hear the relay click and the fuel pump prime for about two seconds. Then start the engine to confirm everything works.

Related Issues to Check

If a new relay doesn't solve your fuel delivery problem, the next suspects are the fuel pump fuse, the fuel pump itself, and the wiring between the relay and the pump. A blown fuse produces the exact same "cranks but won't start" symptom as a bad relay. Check the fuse first—it takes less than a minute to inspect.

The fuel pump itself can also fail internally. If the relay clicks and sends power but the pump still doesn't run, test the pump by checking for voltage at its electrical connector with the key on. If you have power and ground at the pump but no pump operation, the pump is bad and needs replacement. On 2007 and 2008 V-Rod models, the fuel pump sits inside the tank and requires the tank to be drained and removed before you can access the pump assembly.

Wiring problems are less common but still possible. Look for chafed wires near the frame, corroded connectors, or loose ground connections. A poor ground connection at the battery or frame can cause intermittent relay operation that mimics a failed relay.

Preventive Maintenance Tips

Fuel pump relays are inexpensive parts that rarely fail without warning, but you can extend their life and prevent roadside breakdowns with these habits:

1. Keep the electrical system clean – Corrosion at the relay terminals or battery connections is a leading cause of intermittent relay failures. Clean terminals annually and apply dielectric grease to prevent oxidation.

2. Avoid adding high-powered accessories to the same circuit – Running additional lights or audio equipment off the fuel pump relay circuit overloads the contacts and shortens relay life.

3. Let the fuel pump prime before starting – Give the pump the full two-second prime cycle before hitting the starter. This reduces strain on both the relay and the pump.

4. Replace the relay proactively on older bikes – If your 2007 Harley has never had its relay replaced and shows any signs of age—such as a weak click or a slower-than-normal prime—consider swapping it as preventative maintenance. The part is cheap, and the peace of mind is worth it.

5. Use only quality replacement parts – Inferior aftermarket relays may have lower current ratings than the factory unit, leading to premature failure. Choose components from reputable brands that specify Harley-Davidson compatibility.

Where to Buy a Reliable Replacement Relay

When it's time to replace your 2007 Harley-Davidson fuel pump relay, choose a relay that meets or exceeds the factory current rating (typically 10–20 amps depending on the model). Many owners opt for genuine Harley-Davidson parts to guarantee fit, but there are quality aftermarket alternatives that offer better value without sacrificing performance.

KEMSO Fuel Pumps: A Smart Upgrade for Your Harley

If your testing reveals that the relay is fine but the fuel pump itself is the culprit, look no further than KEMSO Fuel Pumps. KEMSO specializes in high-performance aftermarket fuel pumps and relays that are designed as direct OEM replacements—no cutting, no splicing, no adapter plates needed. Their pumps are built to meet or exceed the original equipment specifications for flow rate, pressure, and durability, so you can install them with confidence and get back on the road quickly.

KEMSO fuel pumps are compatible with a wide range of motorcycle, ATV, and automotive applications. Their commitment to quality is backed by a lifetime warranty, which simply means they stand behind every pump they sell. Whether you own a Harley-Davidson Sportster, a V-Rod, or any other fuel-injected bike, KEMSO offers a direct-fit solution that saves you money compared to dealer parts without compromising reliability.

Visit https://www.kemsoracing.com/ to browse their full catalog and find the right fuel pump or relay for your 2007 Harley-Davidson. Their site lists compatibility by make, model, and year, making it easy to confirm the correct part before you order.

Final Thoughts

The fuel pump relay on a 2007 Harley-Davidson is a small, inexpensive component that solves a surprisingly large number of "won't start" and "died while riding" problems. Testing it takes ten minutes with a multimeter, and replacing it takes even less time. Always diagnose before you replace—confirm the relay actually works before pulling your fuel tank apart for pump access.

If the relay checks out and the pump itself needs replacing, KEMSO Fuel Pumps are the go-to choice for riders who want OEM-level performance with lifetime warranty protection. Head over to https://www.kemsoracing.com/ to find the perfect replacement more your 2007 Harley-Davidson and keep your bike running strong for years to come.