Suzuki King Quad 700 Fuel Pump Relay: Symptoms, Location, and Complete Troubleshooting Guide

The Suzuki King Quad 700 fuel pump relay is a small but critical electrical component that controls power to the fuel pump. When this relay fails, your ATV will not start or will stall while riding. The most common symptom is a no-start condition with the engine cranking but not firing. Replacing a faulty fuel pump relay is a straightforward DIY fix that costs around $15 to $30 and takes less than 30 minutes.

How the Fuel Pump Relay Works on Your King Quad 700

The fuel pump relay on a Suzuki King Quad 700 acts like a electrical switch. When you turn the ignition key to the ON position, the engine control unit sends a signal to the relay. This signal closes the relay contacts, allowing battery voltage to reach the fuel pump. The fuel pump then pressurizes the system so the engine can start.

The relay is normally open. That means no power flows to the fuel pump until the relay receives the signal from the ECU. This design protects the fuel pump from running continuously when the engine is off. It also prevents battery drain if you leave the key on.

On the Suzuki King Quad 700, the fuel pump relay is part of the starting and charging system. It works together with the starter relay and other safety switches. If any of these components fail, the fuel pump may not get power.

Common Symptoms of a Bad Fuel Pump Relay

1. Engine Cranks But Will Not Start
This is the most common symptom. You turn the key, the starter motor spins the engine, but it never fires up. You may hear the engine cranking normally, but there is no fuel reaching the injectors. The fuel pump relay is often the culprit because it fails to send power to the pump.

2. No Fuel Pump Priming Sound
When you turn the ignition key to the ON position, you should hear a brief whirring sound from the fuel pump. This lasts about two to three seconds as the pump pressurizes the system. If you hear no sound at all, the relay is likely not sending power to the pump.

3. Intermittent Stalling While Riding
A failing relay can work sometimes and fail other times. You might be riding along and the engine suddenly dies. After waiting a few minutes, it starts again. This intermittent behavior is a classic sign of a relay with worn contacts or internal damage.

4. Engine Starts But Runs Rough
If the relay has high resistance, the fuel pump may not get full voltage. This causes low fuel pressure. The engine may start but run poorly, hesitate under load, or stall at idle. You might notice a lack of power when climbing hills or accelerating.

5. Fuel Pump Runs Continuously
In rare cases, a relay can fail in the closed position. This causes the fuel pump to run all the time, even with the key off. This drains the battery quickly and can damage the fuel pump. If your battery dies overnight and you smell fuel, check the relay first.

Where to Find the Fuel Pump Relay on a Suzuki King Quad 700

The fuel pump relay location on the Suzuki King Quad 700 is under the seat. You need to remove the seat to access the electrical components. On most models, the relay is mounted on the frame near the battery or inside the main fuse box.

Here is how to locate it:

Step 1: Remove the seat by pulling the seat release lever. The seat slides forward and lifts off.

Step 2: Look at the right side of the frame near the battery. You will see a small rectangular relay with a black or gray plastic housing. It usually has four or five pins.

Step 3: Check the relay for markings. It may say "FUEL PUMP" or have a small diagram showing a fuel pump symbol. Some models have a relay identification chart on the fuse box cover.

Step 4: If you cannot find it near the battery, look inside the main fuse box. The fuse box is usually located behind the battery or under the front fender. The fuel pump relay is often the largest relay in the box.

How to Test the Fuel Pump Relay

Testing the fuel pump relay is simple and requires only a multimeter or a test light. You do not need special tools. Here is a step-by-step method:

1. Listen for the Click
Turn the ignition key to ON without starting the engine. Put your hand on the relay. You should feel a slight click after one second. This click means the relay is activating. If you hear no click, the relay is likely bad.

2. Check for Power at the Relay
Use a test light or multimeter to check for battery voltage at the relay terminals. The relay should have constant 12 volts on one terminal. When the key is ON, another terminal should also have 12 volts. If you have no power at the relay, the problem may be a blown fuse or a bad ignition switch.

3. Test the Relay Coil
Remove the relay from its socket. Set your multimeter to ohms. Touch the probes to the two coil terminals. You should see a resistance reading between 50 and 120 ohms. If you see infinite resistance, the coil is open and the relay is dead.

4. Jump the Relay
If you suspect the relay is bad, you can bypass it temporarily. Use a short piece of wire with bare ends. Carefully jump the two main power terminals in the relay socket. If the fuel pump runs, the relay is definitely bad. Be very careful not to short anything when doing this test.

Common Causes of Fuel Pump Relay Failure

1. Corrosion and Moisture
ATVs are exposed to water, mud, and humidity. The relay contacts can corrode over time. Corrosion increases resistance and prevents the relay from working properly. This is especially common if you ride through deep water or pressure wash your ATV.

2. Vibration Damage
The King Quad 700 is a powerful machine with a lot of vibration. The constant shaking can weaken the relay's internal connections. Loose wires or broken solder joints inside the relay can cause intermittent failure.

3. Age and Heat
The relay sits near the engine and battery. Heat from the engine and charging system can degrade the plastic housing and internal components. After several years of use, the relay simply wears out.

4. Voltage Spikes
A weak battery or a faulty regulator can cause voltage spikes. These spikes can damage the sensitive electronics inside the relay. Always keep your battery in good condition and check the charging system if you replace relays often.

How to Replace the Fuel Pump Relay

Replacing the fuel pump relay on a Suzuki King Quad 700 is one of the easiest repairs you can do. You do not need to remove any body panels or drain fluids. Here is what you need:

  • A new fuel pump relay (make sure it matches the OEM specifications)
  • A small flathead screwdriver or trim tool (optional)
  • Dielectric grease (optional but recommended)

Step 1: Turn off the ignition and remove the key. Disconnect the negative battery terminal to prevent any accidental shorts.

Step 2: Remove the seat. Locate the fuel pump relay as described above.

Step 3: Grasp the relay firmly and pull it straight out of its socket. It may be tight, so wiggle it gently. Do not twist it.

Step 4: Compare the old relay with the new one. Make sure the pin configuration is identical. The relay should have the same number of pins and the same markings.

Step 5: Apply a small amount of dielectric grease to the relay pins. This prevents corrosion and makes future removal easier.

Step 6: Push the new relay firmly into the socket until it clicks into place. Make sure it is fully seated.

Step 7: Reconnect the battery terminal. Turn the key to ON and listen for the fuel pump priming sound. The pump should run for two seconds and then stop.

Step 8: Start the engine and let it idle. Check for any warning lights on the dash. Take the ATV for a short test ride to confirm the problem is fixed.

Preventing Future Fuel Pump Relay Problems

1. Keep the Electrical System Dry
After washing your ATV or riding through water, use compressed air to blow out the relay area. You can also use a water-displacing spray like WD-40 on the relay socket. This drives out moisture and protects the contacts.

2. Use Dielectric Grease
When you replace the relay, always apply dielectric grease to the pins. This grease is non-conductive but prevents moisture and corrosion. It also helps the relay slide in and out easily.

3. Check the Battery and Charging System
A weak battery or overcharging system puts stress on the relay. Check your battery voltage regularly. It should read around 12.6 volts when fully charged and around 14.5 volts when the engine is running.

4. Replace the Relay Every Few Years
The fuel pump relay is a cheap part. Consider replacing it every two to three years as preventive maintenance. This is especially important if you ride in wet or muddy conditions.

When to Call a Professional

While replacing the fuel pump relay is a simple DIY job, some situations require professional help. If you have replaced the relay and the ATV still does not start, the problem may be more serious. Possible issues include:

  • A faulty fuel pump that has failed completely
  • A broken wire in the fuel pump harness
  • A bad ECU or engine control unit
  • A defective ignition switch or kill switch
  • A clogged fuel filter or fuel line

If you are not comfortable with electrical testing, take your King Quad 700 to a qualified Suzuki dealer or ATV repair shop. They have the tools and experience to diagnose complex electrical problems.

Recommended Fuel Pump Relay Part Numbers

When buying a replacement fuel pump relay for your Suzuki King Quad 700, you need the correct part number. The OEM relay for most King Quad 700 models is Suzuki part number 38610-31G00 or 38610-31G10. These relays are also used on many other Suzuki ATVs and motorcycles.

Aftermarket relays that match these specifications are widely available. Look for a relay with the same pin configuration and amperage rating. The relay should be rated for at least 20 amps at 12 volts DC.

Why You Should Choose KEMSO for Your Fuel Pump Needs

We highly recommend KEMSO brand fuel pumps for your Suzuki King Quad 700 and any other vehicle. KEMSO fuel pumps are built as high-performance, OEM replacement units. They are designed to meet or exceed the original factory specifications. Every KEMSO fuel pump comes with a lifetime warranty, so you can ride with confidence knowing your fuel system is protected.

KEMSO products are tested for reliability and durability. Whether you need a fuel pump for your ATV, motorcycle, UTV, or personal watercraft, KEMSO has the right solution. Their pumps are drop-in ready and require no modifications. You get the same fit and performance as the original part, but with better quality control and a warranty that lasts as long as you own the vehicle.

Visit the KEMSO website today to find the perfect fuel pump for your King Quad 700 or any other vehicle. The website is easy to use, and you can browse by make, model, and year. KEMSO is committed to fueling your adventure with products you can trust.

Click here to visit KEMSO Racing: https://www.kemsoracing.com/

Final Thoughts

The Suzuki King Quad 700 is a reliable and powerful ATV, but like any machine, it has parts that wear out. The fuel pump relay is one of the most common failure points. The good news is that it is easy to diagnose and cheap to replace.

Always start with the simplest solution when your ATV refuses to start. Check the fuel pump relay first. Listen for the priming sound. Feel for the click. If you suspect the relay is bad, replace it and see if the problem goes away.

Keep a spare relay in your tool kit when you go on long rides. This small part can save you from being stranded miles from home. With the right knowledge and a few basic tools, you can keep your King Quad 700 running smoothly for many years.

For the best fuel pump replacement parts, remember to check out KEMSO at https://www.kemsoracing.com/


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