Porsche fuel pump relay replacement, made easy

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How much does a fuel pump relay replacement cost for Porsche cars?

A typical Porsche fuel pump relay replacement in the UK costs around £65 - £101. Depending on your Porsche model and engine, and whether you live in a big city or a small one, the price of a fuel pump relay replacement on your vehicle can be higher or lower. We computed prices for some of the best-selling Porsche cars in the UK in order to give you an idea of how much a fuel pump relay replacement costs.
Car modelFixter price range
Fuel pump relay replacement for Porsche Boxster£65 - £101

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Our expert insights into fuel pump relay replacement

What does a fuel pump relay do?

The fuel pump relay is the electronic component that controls power to the fuel pump. It is found on virtually all vehicles with an internal combustion engine and is often located in the fuse box which can be found in the engine bay.

What are the signs of a bad fuel pump relay?

Below are the top three symptoms that could indicate you need to replace your fuel pump relay:

  • Poor fuel economy

  • Trouble starting your car

  • Poor engine performance - stalling, poor acceleration, rough idling

What happens when we do a fuel pump relay replacement on your car?

Our certified mechanics will:

  • Inspect the entire fuel system and test it for any issues

  • They will then locate the fuse box, usually found in the engine bay

  • If necessary, they will remove the old relay and replace it with a new one

  • They will they retest the fuel system and check the fuel pump is working

Daniel, from LondonDaniel, from London

Hey Fixter, what are the signs of a bad fuel pump relay?

The most common signs of a bad fuel pump relay are poor fuel economy, difficulty starting your car and poor engine performance.

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Want to learn more about Porsche fuel pump relay replacement?

What does a fuel pump relay do?

The fuel pump relay is the electronic switch that controls power to the fuel pump. It is found on virtually all vehicles with an internal combustion engine and is often located in the fuse box which can be found in the engine bay. The fuel pump relay is also responsible for helping your vehicle to start. The relay activates the fuel pump to pressurise the fuel system as you turn the key.

The fuel pump is a small pump which sends the fuel from the tank to the engine. The pump may be mechanically worked by the engine, but on most modern cars it’s electrically-powered. In this case it’s usually found next to or even inside the fuel tank.

This process of pumping fuel from the tank to the engine is essential in the smooth running of your vehicle, therefore a faulty fuel pump relay will cause major performance and drivability issues with your vehicle.

Porsche

Porsche AG is a German automobile manufacturer, established over 88 years ago in 1931, and is renowned for producing high-performance sports cars, SUVs and saloon cars.

Porsche is owned by Volkswagen AG and carries a total equity of over €10billion (according to 2015 figures).

Who wouldn’t want a Porsche? Porsche has been setting standards in high-performance sports vehicles for as long as they’ve been in the industry.

There are currently around 146k Porsche vehicles on the roads in the UK, showing a steady rise in numbers over the past 10 years.

Luxury, high-end performance sports cars

With a back catalogue of historic models too numerous to mention, the current range provides typical 2-seat mid-engine sports cars in the Porsche 718 and Porsche 911 models, luxury touring in the Panamera 4-seat full-size saloon and a luxurious level of crossover driving in the Cayenne and Macan SUVs.

Sporting a selection of SUV models

Given the popularity of the SUV in modern driving, it was only a matter of time until the high-end marques got involved in revving up the performance and presentation.

For example, the Cayenne Turbo can accelerate from 0–62mph in 4.1 seconds with a top speed of 177mph. The hybrid electric model is equally as impressive with figures of 5.0 seconds and 157mph. That should take care of the school run in record time.

Porsche electric: the plug-in hybrid range

In 2010, the both Porsche SUV models and the Porsche 918 were released as hybrid electric versions. Currently, only the Cayenne is available as an electric hybrid, but Porsche is building towards the release of their E-performance range: with the new Taycan all-electric sports car being developed through the Mission E Cross Turismo concept study.

How often should a fuel pump relay need replacing?

There is no set lifespan of a fuel pump relay, however the relay is designed to last the life of the car, but due to its constant use and the high temperatures it is exposed to, it will not usually last that long. Over time, the fuel pump relay may begin to show signs of wear and will have to be replaced.

The most commonly damaged portions of the fuel pump relay that tend to malfunction first are the coil and contact points. Usually, these parts of the relay will begin to oxidise and rust over time.

The law, vehicle regulations and your MOT

If the fuel system is not working properly, this may result in an MOT fail. Similarly, if a failing fuel pump relay has caused your check engine light to illuminate, this could lead to an advisory or failure.

What causes a fuel pump relay to break?

The fuel pump relay can fail for many reasons, from dust to electrical power surges, or a blown fuse to a fault in the pump. Many things can affect the functionality of the fuel pump relay.

What are the signs of a failing fuel pump relay?

Usually, there a few signs you can look for:

  • Poor fuel economy

  • Trouble starting your car

  • Poor engine performance - stalling, poor acceleration, rough idling

  • Check engine light

  • Car stops whilst driving

How often should you replace your fuel pump relay?

There is typically no maintenance schedule for fuel pump relay replacement. However, it may not be a bad idea to replace the fuel pump and the relay on an older, high mileage vehicle. Regularly maintaining small components such as the fuel pump relay could save you costly repair bills down the line.

What happens during a fuel pump relay replacement?

During the repair our certified mechanics will:

  • Inspect the entire fuel system and test it for any issues

  • They will then locate the fuse box, usually found in the engine bay

  • If necessary, they will remove the old relay and replace it with a new one

  • They will they retest the fuel system and check the fuel pump is working

What is the average life of a fuel pump relay?

There is no set lifespan of a fuel pump relay, however over time, the fuel pump relay can begin to show signs of wear and will have to be replaced. The fuel pump relay is designed to last the life of the car, but due to its constant use and the high temperatures it is exposed to, it will not usually last that long.

The most commonly damaged portions of the fuel pump relay that tend to malfunction first are the coil and contact points. Usually, these parts of the relay will begin to oxidise and rust over time.

Can you drive with a broken fuel pump relay?

It is best to avoid driving with a failing fuel pump relay. If the fuel pump relay has an issue, power may be randomly cut off to the fuel pump, which will cause the engine to stall whilst driving. Problems with your fuel pump relay will also result in frequent stalling and poor fuel economy, problems which are inconvenient and costly. It’s always best to have a faulty fuel pump relay checked as soon as possible to avoid these issues.

What happens if you don't change the fuel pump relay?

If the fuel pump relay has an issue, power may be randomly cut off to the fuel pump, which will cause the engine to stall whilst driving. Problems with the relay may also result in frequent stalling and poor fuel economy, which are both inconvenient and costly.

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