Troubleshooting a Blown Fuel Pump Fuse: What to Know

Fuel Pump Fuse Blows While Driving

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Have you ever noticed your car engine stall or stop the car suddenly? Then it’s good to blame the fuel pump and its other components. It’s not beyond the point that a car owner faces fuel pump issues now and then. Likewise, you may encounter a fuel pump fuse blowing while driving.

Unfortunately, many car owners like you don’t have enough knowledge of why the fuel pump fuse blows while driving. One of the possible reasons behind it is a faulty fuel pump. A wide range of reasons can be blamed in addition to the wrong fuel pumps.

However, in this troubleshooting guide, we’ll discuss the possible reasons, symptoms of a blown fuel pump fuse, and related information. So, don’t skip and mend your further hassle now.

Reasons Why Fuel Pump Fuse Blows While Driving

Reasons Why Fuel Pump Fuse Blows While Driving

It’s frustrating to encounter a blown fuse repeatedly. It’s more frustrating when you replace the old fuse with a new one but it still blows. In this case, you should know why the fuel pump fuse gets damaged frequently and what the steps are to solve this problem. Let’s clear the matter in detail.

Reason #1: Damaged Fuel Pump

A broken fuel pump can be the first and foremost cause of a blown fuse. When the fuel pump goes bad or stops working, the engine does not get enough fuel. This causes the engine to overheat very quickly without getting enough fuel. Inadequate fuel delivery affects combustion which in turn assists to damage the fuse.

Reason #2: Electrical Issue

This is a common yet concerning cause behind your pump fuse blow. It happens due to bad wiring or an issue with the ignition button. Usually, a proper electrical connection helps to power up the pump. But when any inappropriate thing happens with this connection, you’ll face difficulty starting, the engine will stall, etc. However, if the voltage gets lower, the fuel pump can’t work deliberately, which in turn may cause fuse failure.

Reason #3: Faulty Or Corroded Connections

If any rust or debris or sludge is stuck on the wiring, it will damage the entire fuel pump. If the connector that supplies the required electricity gets rusted, it can’t draw enough current or voltage. As a result, all the pressure takes the pump itself and starts to fail. The dirty or faulty commutator, brush holder Brush electrode, and brush is also responsible for fuse blowout.

Reason #4: Wrong Fuel Pump Relay

The fuel pump relay is another important component of the fuel pump. When it gets damaged, the fuel pump starts to turn off the service. Fuel pump relay fails due to a number of reasons like overheating, contamination, manufacturer defects, electrical surges, etc. This way, the pump gets less power to play which causes the fuse to fail or blow repeatedly.

Reason #5: Crank Or Clogged Fuel Filter

A clogged fuel filter or strainer is another culprit behind fuel pump failure. And as the pump fuse is connected to the fuel pump, you experience rapid fuse malfunction. Fuel filter gets clogged for multiple reasons like metallic deposits that form and accumulate rust.

Also, if there is excessive water in the fuel tank, it’s possible to jam the filter. Thus, the fuel can’t get enough fuel and the electrical system works hard to keep the combination ok. Due to this, the fuse gets blown.

In addition to the above reasons, the fuel pump fuse blows completely due to the excessive current flowing, bad fuel injectors, higher resistance between pump and relay, and faulty fuel pump motor.

How to Troubleshoot a Blown Fuel Pump Fuse Like a Pro!

How to Troubleshoot a Blown Fuel Pump Fuse Like a Pro!

The fuel pump fuse keeps blowing after one after is a great loss, frustrating, and potentially hazardous, especially when it blows while driving. After knowing the common reasons and symptoms. Now, we are in the fixing zone. Let’s see a step-by-step guide to fixing a blown fuel pump fuse.

Step 1: Identify the Exact Problem

First, you need to identify the exact source and cause of why this unwanted thing happened repeatedly. If you are sure, the fuel pump fuse disturbs you when driving, go further.

Step 2: Find the Fuel Pump Fuse

After recognizing and being sure about the problems, locate the fuel pump fuse. Mostly, you can find the fuse in the fuse box or power distribution center which is located under the hood or car’s dashboard. Under the steering column, you can also find a minor fuel box. It’s best to look at the owner’s manual. This will help you to find the fuse on your make and model.

Step 3: Check the Fuse Conditions 

Once you have done finding and located the fuel pump fuse, remove it safely. Here you can use the fuse puller to remove it. deeply examine it. To diagnose or test the fuse, use a fuse tester or multimeter and see if the fuse work or not. If the multimeter produces no sound or the resistance reading is null, understand the fuse is blown.

Step 4: Check the Wiring

If you found there is no issue with the fuse, check the wiring. It might happen that the wiring or connection disconnects to the fuel pump and the relay. Any inappropriate matter like a loose connection or faulty wiring leads the fuse to blow. After that, look at the fuel pump relay. Less power supply on the pump causes the fuse to blow out.

Step 5: Examine the Fuel Pump

The following step is to check the fuel pump. A clogged fuel filter and insufficient fuel delivery verily cause the fuel pump to fail. To check whether the fuel pump is okay or not connect the pump to the battery. Here you can use a jumper wire. Check if the fuel pump working or not. If yes, the fuel pump is okay.

Step 6: Change the Fuse

After fixing all the issues and replace with new ones, replace the blown fuse with a fresh one. It’s also recommended to consult with a professional automotive repair expert to make the task easier.


A fuel pump is a critical component that plays a crucial role to keep the performance tuning. Without the right fuel delivery, the engine is left without performing. And the fuel pump fuse is related to the fuel pump. Over time, you may notice the fuel pump fuse blows out completely again and again.

It happens mostly due to wiring or electrical connection malfunction in the fuel system. In this case, you should identify the exact reasons and then troubleshoot. This guide covered the reasons why fuel pump fuse blows while driving and how to fix the problem step-by-step. Hope, you find it beneficial, and will be great to eliminate further hassle.

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