Rick's Free Auto Repair Advice

Why is fuel pump replacement cost so high?

How is fuel pump replacement cost calculated?

When your fuel pump goes bad, drivers are usually stunned by the high fuel pump replacement cost and wonder if they’re getting scammed. If you own a late model fuel injected vehicle, the fuel pump module is usually replaced as a complete unit, rather than replacing just the fuel pump. The

fuel pump module showing the names of each part

The fuel pump module housing contains the fuel pump, pulsator, filter sock, fuel level sensor, float and float arm, inlet and outlet connections, and springs to keep the unit at the bottom of the tank

module is located INSIDE the gas tank and to replace the fuel pump module, you have to drain and remove the entire gas tank. Before we dive into fuel pump replacement costs, let’s take a look and why they go bad and what goes into the replacement.

What causes fuel pumps to go bad?

If you really want to kill your fuel pump fast, just run your car out of gas. Running out of gas is one of the major causes of fuel pump failure. Car makers rely on the gasoline in your tank to cool the electric motor that spins the fuel pump’s impeller. When you run out of gas, the motor overheats. In addition, it starts sucking in the last bit of gas in your tank and that gas can contain dirt and grit that’s settled at the bottom of the tank over the years. Yes, there’s a filter on the fuel pump to keep the crud out, but the pump’s suction is strong enough to pull that crud in if you let it run too low. If you routinely run your car with less than ¼ tank, you run the risk of early fuel pump failure.

However, there are other reasons why fuel pumps fail. The fuel pump module contains the fuel pump, a check valve, a pulsation damper, fuel post-pump fuel filter and the fuel level sensor. The check valve is designed to keep pressure in the fuel line when you shut off the engine. That way, pressurized fuel is ready to go as soon as you turn the key. It’s common for fuel line pressure to fall about 5-psi when the shut the engine down. But if the check valve goes bad, all the fuel will drain back into the tank and you’ll experience long crank times when you try to start the engine after its been sitting. Unfortunately, car makers don’t offer the check valve as a separate item. Even if they did, your mechanic would still have to drain and remove the gas tank and remove the entire fuel pump module to replace the check valve.

A faulty pulsation damper can cause the fuel pump to make noise and a clogged post-fuel pump filter can put extra strain on the fuel pump and cause it to fail early. Finally, a bad fuel pump relay, fuel pump flow control module or bad fuel pump ground cause a voltage drop that can overheat the motor windings and cause fuel pump failure.

Dissecting fuel pump replacement cost

Let’s look at why fuel pump replacement cost is so high. We’ll use a 2010 Buick Enclave as an example. This vehicle actually has two fuel pumps; one in the tank that brings fuel pressure to around 50-psi, and a second fuel pump on the engine that boosts fuel pressure to almost the 2,000-psi needed to operate the gasoline direct injection system.

The flat rate guide shows that it takes 1.9-hrs. to drain and remove the tank and replace the fuel pump module. The pump itself lists for $388.60. With a shop rate of around $100-hr, this fuel pump replacement cost totals around $600.

Step by step fuel pump module replacement for Buick Enclave

Draining the fuel tank takes about 20-mins, depending on how full it is

Disconnecting the fuel line and evaporative emissions system from the tank takes about 10-mins.

Removing the tank from the vehicle takes about 10-mins once it’s drained

Unlocking the fuel pump locking ring and removing the old pump takes about 10-mins.

Cleaning the gas tank can take up to one hour depending on how much crud is inside.

Installing the new fuel pump module and reinstalling the tank takes about 30-mins.

fuel pump replacement cost

©, 2016 Rick Muscoplat




Posted on by Rick Muscoplat

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