Harley Davidson Fuel Pump Relay Location: The Ultimate Practical Guide

The fuel pump relay on your Harley Davidson motorcycle is almost always located in the main fuse box or a nearby relay module under the seat. On nearly all models released after 2000, you’ll find it in the fused electrical center beneath the rider’s seat or side cover. Exact placement varies slightly by year and model—like Touring bikes versus Sportsters—but accessing it simply requires removing a few fasteners or panels near the seat area.

This universal location keeps the relay protected yet accessible. When this small electrical switch fails, your motorcycle won’t start or may stall unexpectedly. Knowing exactly where to find the Harley Davidson fuel pump relay is critical for troubleshooting or replacing it yourself. This guide details every model’s relay location, access steps, and essential fixes without technical jargon—just clear, actionable help to get you back on the road fast.

Why the Harley Fuel Pump Relay Is Crucial

Your Harley Davidson fuel pump relay is a switch that controls power flow to the fuel pump. When you turn the ignition key, the relay receives a signal from the ECM (engine control module) to activate the pump. Without a functioning relay, no fuel reaches the engine. Common failure symptoms include a silent fuel pump when turning the key, sudden engine shutdowns, or repeated stalling during operation. Ignoring these signs risks permanent fuel pump damage. Most relays last 5–10 years but fail earlier under vibration stress or moisture exposure. Testing the relay first saves time and money versus replacing pricier components like the pump itself.

Harley Davidson Fuel Pump Relay Locations by Model

Since Harley uses standardized electrical layouts across decades, relay placement clusters into distinct model groups. All require seat removal for access. Use a basic toolkit like a T-handle hex key set or a quarter-inch socket driver.

2007–Present Touring, Trike, and CVO Models

Models like Road Glide, Street Glide, Ultra Limited, and Tri Glide house the relay in the fuse box positioned under the rider’s seat. Unlatch the seat at the rear, lift it off, and look for a black plastic housing near the battery. Open the lid to reveal two rows of relays and fuses. The fuel pump relay is typically the second or third 5-pin relay from the left, labeled "FP," "FUEL," or "PUMP" on later models. Pre-2014 bikes may lack markings—use the top-right position as your guide.

2000–2024 Dyna, Softail, Sportster Models

For motorcycles like Fat Boy, Low Rider, Street Bob, Sportster XL/XR, and Heritage Classic, the relay sits in a compact fuse box directly under the seat. Remove the seat's mounting bolts (often 5/16-inch or 8mm) and disconnect any wiring clips. Locate the rectangular fuse module alongside the battery. The fuel pump relay occupies a corner slot—usually bottom-left—among a cluster of smaller relays. Early 2000s Sportsters sometimes feature it near the ignition coil under the left side cover instead.

2002–2017 V-Rod Series (VRSC Models)

VRSC models, including V-Rod and Muscle, pack electrical parts tightly under a single seat. Pull the rear seat release lever to access the compartment above the rear fender. The relay bank is behind the battery, secured with a small bracket. Expect the fuel pump relay in the center position of five horizontal slots. Confirm by checking for a pink/white power wire leading to it.

1995–1999 Pre-EFI Models with Retrofit Relays

Though early carbureted bikes lacked relays, later EFI conversions add a relay module near the battery. Look for an aftermarket black box or a factory-style fuse panel under the seat. The relay will connect to thick yellow and pink/white wires—follow them to the relay.

Step-by-Step Access and Removal

Work safely on a cool motorcycle with the ignition off. Wear gloves to protect against sharp edges. Steps apply universally:

1. Remove the rider’s seat: Unlatch or unscrew bolts (typically two to four) holding the seat. Dyna models may require loosening rear shock nuts. Lift the seat straight up to avoid snagging wires.
2. Identify the relay housing: Spot the fused electrical center—a hard plastic case near the battery or ECM. Most are about 6 inches long with hinged lids.
3. Open the fuse box: Release plastic clips or thumbscrews and lift the lid. A diagram might be printed inside—match "FUEL PUMP" or "FP" to the layout.
4. Locate the fuel pump relay: Scan for a standard 5-pin cube relay (1.5 inches square) in the assigned slot. Wiggle it lightly; it should feel loose in its socket.
5. Extract the relay: Press the locking tab down and pull straight up. Inspect terminals for corrosion or melted plastic.

Simple Fuel Pump Relay Testing

You don’t need tools to check for failure. Reinsert the relay and turn the ignition key to "ON" without starting the bike. A working relay emits a firm click within two seconds as it activates the pump. No sound points to a failure. For more precision, switch it with an identical relay (like the horn relay) from the same fuse box. Turn the key to "ON" again—if you hear the click now, the original relay is faulty.

Replacing the Fuel Pump Relay

Always replace a failed Harley relay immediately. Use Harley OEM part numbers like 32799-05B (post-2000 models) for exact compatibility. Aftermarket brands like Kuryakyn work too if they meet 30-amp ratings. Ensure the new relay has matching pin configurations. Installation reverses removal—align the pins, press into the socket, and lock the tab. Test functionality before reassembly. Cost ranges from $15(aftermarket)to$45 (OEM), and swap time is under 10 minutes.

Prevent Relay Failures

Avoid repeated fuel pump strain by shutting off the engine before refueling. Water resistance is key—keep the fuse box lid sealed to block rain. Apply dielectric grease to relay terminals annually to fight corrosion. For long hauls, carry a spare relay; it fits easily in a saddlebag toolkit. Regular fuse box inspections during oil changes catch early issues like melted connectors.

Troubleshooting Checklist When the Relay Isn’t the Issue

If a new relay doesn’t solve starting problems, methodically check these areas:

• Fuse: Test the 15-amp or 20-amp fuse labeled "FP" in the fuse box. Replace any blown fuse after inspecting for wiring shorts.
• Battery: Weak batteries (below 12.4 volts) can’t trigger the relay. Confirm strong voltage using a multimeter.
• Wiring: Trace pink/white wires from the relay for cuts or rust spots. Damaged wires disrupt the signal from the ECM to the relay.
• Fuel Pump: Listen for pump humming under the seat when the key is on. Silence indicates pump failure or a dead connection.
• Ignition Switch: Faulty switches prevent power from reaching the fuse box.

Final Tips for Every Harley Owner

Your Harley Davidson’s fuel pump relay—though small—holds power over your entire ride. Prioritize locating it quickly using this guide. Bookmark this page or note your relay’s position in your maintenance log. Stash an emergency relay in your kit to sidestep roadside breakdowns. Regular attention preserves reliability and keeps your engine running strong for miles ahead.