Inline Fuel Pump Autozone: What You Need to Know Before Buying
If you are searching for an inline fuel pump at Autozone, the most important thing to understand is that Autozone offers a range of inline fuel pumps, but you must match the pump to your vehicle’s specific fuel pressure requirements, flow rate, and electrical system. Not all inline pumps fit all cars, and using the wrong one can cause engine performance issues or even damage. This article explains how to choose, install, and maintain an inline fuel pump from Autozone, with practical steps and warnings.
What is an inline fuel pump and why would you need one
An inline fuel pump is a device that moves gasoline or diesel from the fuel tank to the engine. Unlike in-tank pumps that are submerged inside the fuel tank, inline pumps are mounted outside the tank, usually along the fuel line under the car or near the engine. Inline fuel pumps are common in older vehicles, high-performance cars, or as replacements when the original in-tank pump fails. You might need an inline fuel pump if your vehicle was originally designed with one, if you are upgrading a classic car, or if the in-tank pump is not available or too expensive to replace.
Autozone stocks inline fuel pumps from brands like Carter, Delphi, Bosch, and Airtex. These pumps are typically electric and use a gear or roller vane design to pressurize fuel. They work with carbureted or fuel-injected engines, but the pressure requirements are very different. Carburetors usually need low pressure around 4-7 PSI, while fuel injection systems need high pressure from 30 to 60 PSI or higher. Using a low-pressure pump on a fuel-injected engine will starve the engine of fuel, while a high-pressure pump on a carbureted engine can blow seals or flood the carburetor.
How to choose the right inline fuel pump at Autozone
The first step is knowing your vehicle’s fuel system type. Check your owner’s manual or look under the hood. Do you have a carburetor or fuel injectors? If you are not sure, you can ask an Autozone associate or look up your car’s specifications online. Once you know the system type, follow these three steps.
1. Confirm the correct fuel pressure. For a carbureted engine, look for pumps rated between 4 and 7 PSI. For a fuel-injected engine, look for pumps that match your vehicle’s required PSI, which is often stamped on the original pump or listed in repair manuals. Autozone’s website lists pressure ratings for each pump. Do not guess.
2. Check the flow rate. Flow rate is measured in gallons per hour or liters per hour. A stock engine usually needs 20-30 GPH, but high-horsepower engines may need 50 GPH or more. If you have a modified engine with a turbocharger or big injectors, you need a pump with higher flow. Autozone associates can help you cross-reference parts.
3. Verify the electrical compatibility. Inline pumps require proper voltage and amperage. Most are 12-volt, but some older vehicles use 6-volt systems. Also, check the pump’s electrical connector. Some pumps have spade terminals, others have screw-type lugs. Autozone sells wiring kits and connectors separately if needed.
Common inline fuel pump brands at Autozone and their differences
Autozone carries several brands, and each has strengths. Carter pumps are known for reliability and are often direct replacements for many GM and Ford vehicles. Delphi pumps are premium and come with high-quality internal components, but they cost more. Bosch pumps are popular for European cars and are often used in performance applications because of their consistent pressure. Airtex pumps are budget-friendly and suitable for older cars that do not need high precision.
When shopping, look for "inline fuel pump" on the box and confirm it is not an "in-tank pump." The packaging will also list the flow and pressure. Do not buy a pump based solely on price. A cheap pump may fail quickly or not deliver enough fuel under load.
Step-by-step instructions for installing an inline fuel pump from Autozone
Installing an inline fuel pump is a straightforward job for a DIY mechanic, but safety is critical because you are working with gasoline. Work in a well-ventilated area away from sparks or flames. Disconnect the battery negative terminal before starting. Have a fire extinguisher nearby.
1. Relieve fuel pressure. If your vehicle has fuel injection, you must relieve pressure in the system. Locate the fuel pump relay or fuse and pull it out. Then start the engine and let it run until it stalls. For carbureted engines, the pressure is lower, but you should still disconnect the fuel line and let any residual gas drain into a container.
2. Locate the old inline pump. Typical mounting locations are under the vehicle near the gas tank or along the frame rail. Use a jack and jack stands if needed. Clean the area around the pump with a rag to remove dirt.
3. Remove the old pump. Disconnect the electrical wires. Take a picture or label the wires so you do not mix them up. Then loosen the fuel line fittings using wrenches. Be careful not to strip the nuts. Have a container ready to catch any fuel that drips out. Remove the mounting bracket bolts and take the pump out.
4. Install the new pump. Mount the new pump in the same bracket. Use the supplied rubber isolators or grommets to reduce vibration noise. Tighten the bracket bolts. Connect the fuel lines. Use thread tape or sealant on the fittings if recommended by the pump instructions. Do not overtighten. Connect the electrical wires. Most pumps have a positive and negative terminal. Check polarity.
5. Test for leaks. Reconnect the battery. Turn the ignition key to the "on" position without starting the engine. The pump should run for a few seconds and then stop. Listen for any unusual sounds. Look for fuel leaks at the fittings. If you see any drips, tighten the fittings slightly. Then start the engine and check again.
6. Secure the lines. Make sure fuel lines are not rubbing against metal edges or hot engine parts. Use zip ties or clamps to keep them in place.
Common problems after installing an inline fuel pump and how to fix them
Even if you follow all steps, issues can arise. Here are three common problems and solutions.
1. Pump runs but no fuel flows. This often means the pump is priming but not drawing fuel. Check if the fuel filter is clogged. Also, verify that the inlet and outlet hoses are not reversed. Some pumps have arrows on the housing to show flow direction. If the pump is mounted too high above the tank, it may struggle to draw fuel. Move it lower if possible.
2. Pump makes loud noise. Inline pumps should hum quietly. If the pump is loud, it might be vibrating against the frame. Make sure rubber isolators are in place. Also, check if the pump is mounted with the outlet pointing upward or sideways as per the manufacturer’s orientation. Some brands require specific positioning to stay quiet.
3. Pump runs constantly and does not shut off. This could be an electrical problem. Look for a stuck relay or a bad oil pressure switch. Some vehicles only turn the pump on when oil pressure is present. If the pump runs without the engine running, fix the relay or switch first. Running the pump dry can damage it.
Maintenance tips for inline fuel pumps
To make your Autozone inline fuel pump last longer, keep these points in mind.
1. Change the fuel filter regularly. A clogged filter makes the pump work harder. Replace your fuel filter every 20,000 to 30,000 miles or as recommended.
2. Keep the fuel tank at least a quarter full. Running the tank low can cause the pump to suck in air or debris from the bottom of the tank. Air can damage the pump and reduce lubrication.
3. Use fuel additives sparingly. Some additives can damage rubber seals inside the pump. Stick to top-tier gasoline and only use additives if needed.
4. Protect the pump from heat. Do not route fuel lines too close to the exhaust manifold or catalytic converter. Excessive heat can vaporize fuel inside the pump and cause cavitation.
When to replace rather than rebuild
Some Autozone stores sell inline fuel pump rebuild kits with seals and internal parts. Rebuilding is possible but not recommended for most people because the pump housing may wear out. If your pump is more than 5 years old, it is better to replace than rebuild. New pumps come with a warranty. Most Autozone inline pumps have a 1 to 3-year warranty. Keep your receipt.
How to get help from Autozone
Autozone offers free resources that can help you. You can ask an associate to look up your vehicle’s fuel pump part number using the store’s computer system. They can also print a repair guide for your specific car. Many Autozone locations lend tools for free, like fuel line disconnect tools and wrenches. You can check tool availability online or call ahead.
If you are not sure about the pump you need, you can bring your old pump to the store. Associates will compare it to new pumps in stock. They can also help you find the correct fuel filter and wiring connectors.
Potential safety hazards you should know
Gasoline is flammable. Work outdoors if possible. Do not smoke or use any open flames. After installation, check for leaks at least twice. If you smell gas, stop driving immediately and inspect the system.
If your new pump makes a whining or screeching sound, it may be failing. Stop the engine and check the fuel level and filter. Driving with a failing pump can leave you stranded. Autozone allows returns within 90 days, so if the pump seems defective, exchange it.
Final conclusion about inline fuel pumps at Autozone
An inline fuel pump from Autozone can be a reliable solution for your vehicle if you choose the right one for your fuel system type, install it correctly, and maintain it properly. The store offers multiple brands, free assistance, and tool rentals to simplify the process. Always verify pressure and flow specifications before buying, and never skip safety steps. If you have further questions, Autozone associates are usually knowledgeable about basic automotive systems and can guide you to the correct part. With careful selection and installation, an inline fuel pump from Autozone will help your engine get the fuel it needs for years of trouble-free driving.