1958 Corvette Fuel Pump: The Complete Guide to Replacement, Upgrade, and Reliability
If you own a 1958 Chevrolet Corvette, the fuel pump is one of the most critical components for keeping your classic car running reliably. The original mechanical fuel pump on the 1958 Corvette delivers fuel at a pressure of 5 ¼ to 6 ½ PSI , and whether you are restoring a numbers-matching car or building a pro-touring cruiser, understanding your fuel pump options is essential. The bottom line is that your 1958 Corvette fuel pump must match your engine’s specific fuel delivery requirements—from the base 230 hp engine all the way up to the rare 290 hp fuel-injected option—and choosing the right pump ensures your car starts, runs, and drives as intended.
Understanding Your 1958 Corvette Fuel Pump
The 1958 Corvette came with several engine options, each requiring specific fuel pump configurations. The base engine was a 283 cubic inch V8 producing 230 horsepower, but options included the 245 hp two-four-barrel setup, the 270 hp special cam version, and the top-of-the-line 250 hp and 290 hp fuel-injected engines . The fuel pump on all these engines was mechanical, driven by the camshaft, and mounted on the side of the engine block.
Fuel pressure specifications for the 1958 Corvette are consistent across most engine configurations: 5 ¼ to 6 ½ PSI . This relatively low pressure is typical for mechanical fuel pumps of the era, which supply fuel to the carburetor or fuel injection unit at a steady rate.
Fuel Pump Types and Part Numbers for 1958 Corvette
The 1958 Corvette used different fuel pump designs depending on the production date and engine specification. Here is a breakdown of the most common fuel pump part numbers:
1. AC Delco #4445 – Early 1958 Production (First Design)
This pump was used from 1957 through early 1958 production. It has an inlet opening clocked at 9:00 and an outlet opening clocked at 3:00 . This means the inlet and outlet ports are positioned 180 degrees apart, with the inlet on the left side and the outlet on the right side when viewed from the front of the pump.
2. AC Delco #4656 – Late 1958 through 1962 Production
This is the second design pump, used from late 1958 through 1962. It has an inlet opening clocked at 10:00 and an outlet opening clocked at 8:00 . The ports are also 180 degrees apart, but the orientation is rotated compared to the early design. This pump is a reproduction part that is made as close to OEM specifications as possible .
3. AC Delco #4663 – 1958 Corvette with 250 hp Fuel Injection
This is a rare and hard-to-find fuel pump specifically designed for the 1958 Corvette with the 250 hp fuel-injected engine. According to the NCRS Judging guides for 1958-1960, the AC Delco #4663 is the correct pump for this application . It is unique because the inlet and outlet are 180 degrees apart, and the outlet is located in front of the pump . The pump features original inspection stampings and cadmium plating, and it is considered very close to NOS (New Old Stock) condition .
4. AC Delco #4346 – 1956-1957 Corvette (Not 1958)
This pump is listed for 1956-1957 Corvettes with a rebuilt original version available . It is important to note that this pump is not correct for the 1958 model year, but it is sometimes confused with 1958 applications.
5. Fuel Injection Pump – Rochester Products 7014900
For the 1958 Corvette with factory fuel injection, the fuel metering system is different from carbureted engines. The fuel injection system uses a Rochester Products model 7014900 fuel meter assembly, which includes a gear-type fuel pump driven by a flexible shaft from the distributor . This pump operates at 300 PSI, which is significantly higher than the mechanical fuel pump pressure . The mechanical fuel pump in this system still delivers fuel to the injection unit at the standard 5 ¼ to 6 ½ PSI, but the fuel meter pump inside the injection assembly boosts the pressure to 300 PSI for the injectors.
Common Fuel Pump Problems and Symptoms
If your 1958 Corvette is experiencing fuel delivery issues, the fuel pump is often the culprit. Here are the most common symptoms:
1. Engine Cranks but Won't Start
If the fuel pump is not delivering fuel to the carburetor or injection unit, the engine will crank but fail to start. This is often the first sign of a failing pump.
2. Engine Stalls Under Load
A weak fuel pump may not be able to maintain adequate fuel pressure when the engine is under load, such as when accelerating or climbing a hill. The engine may sputter or stall.
3. Loss of Power at High Speeds
If the fuel pump cannot keep up with the engine's demand at higher RPMs, you may experience a noticeable loss of power.
4. Fuel Leaks
Mechanical fuel pumps can develop leaks from the diaphragm or the gasket between the pump and the engine block. Look for fuel drips or a strong gasoline smell around the pump area.
5. Noisy Operation
A failing fuel pump may make a clicking or knocking sound as the internal components wear out.
How to Replace the Fuel Pump on a 1958 Corvette
Replacing the fuel pump on a 1958 Corvette is a straightforward job that most DIY mechanics can handle. Here is a step-by-step guide:
Step 1: Disconnect the Battery
Always disconnect the negative battery cable before working on the fuel system to prevent any accidental sparks.
Step 2: Remove the Fuel Lines
Use a flare nut wrench to loosen the fuel line fittings at the pump. Be careful not to damage the brass fittings. Have a rag handy to catch any fuel that may drip out.
Step 3: Remove the Pump Mounting Bolts
The fuel pump is held to the engine block by two bolts. Use a wrench or socket to remove these bolts. The pump may be tight against the block, so you may need to gently pry it loose.
Step 4: Remove the Old Pump
Once the bolts are removed, pull the pump straight out from the engine block. Be careful not to lose the push rod that connects the pump to the camshaft. The push rod should slide out with the pump.
Step 5: Clean the Mounting Surface
Use a clean rag to wipe the mounting surface on the engine block. Make sure there is no old gasket material or debris that could cause a leak.
Step 6: Install the New Gasket and Pump
Place the new gasket on the mounting surface, then install the new pump. Make sure the push rod is properly aligned with the pump arm. Tighten the mounting bolts to the manufacturer's recommended torque.
Step 7: Reconnect the Fuel Lines
Reconnect the fuel lines to the pump. Tighten the fittings securely, but do not overtighten them, as this can damage the brass fittings.
Step 8: Check for Leaks
Before starting the engine, check all connections for tightness. Then start the engine and inspect for any fuel leaks. Listen for unusual noises and verify that the engine runs smoothly at all speeds.
Performance Upgrades for Your 1958 Corvette Fuel Pump
If you are building a pro-touring or resto-mod 1958 Corvette, upgrading the fuel pump is a smart move. Many modern builds replace the original mechanical pump with a high-volume electric pump to ensure reliable fuel delivery for higher-horsepower engines.
For example, a 1958 Corvette resto-mod build featured in Motor Trend uses a Walbro 255-lph fuel pump to support an LS6 engine . Another custom 1958 Corvette build uses an Aeromotive fuel pump and regulator to handle the demands of a supercharged LT4 engine .
When upgrading to an electric fuel pump, you will also need to install a fuel pressure regulator to maintain the correct pressure for your carburetor or fuel injection system.
Why Choose KEMSO Fuel Pumps for Your 1958 Corvette
When it comes to replacing or upgrading the fuel pump on your 1958 Corvette, KEMSO is the brand you can trust. KEMSO offers high-performance fuel pumps that are designed as direct OEM replacements, meaning they fit perfectly and perform exactly as your vehicle requires. Whether you are restoring a classic Corvette or building a modern performance machine, KEMSO has the right fuel pump for you.
KEMSO fuel pumps are built with quality and reliability in mind. Each pump is individually tested to ensure it meets strict performance standards. The KEMSO 340LPH High Performance Fuel Pump, for example, delivers up to 340 liters per hour of flow, supporting up to 600 BHP and working with both gasoline and E85 . This pump features a carbon commutator designed for over 10 years of reliable service .
All KEMSO fuel pumps come with a lifetime warranty, giving you peace of mind that your investment is protected . KEMSO is based in Houston, Texas, and offers USA-based customer support to help you find the right pump for your vehicle .
KEMSO offers a wide selection of pumps for cars, motorcycles, ATVs, and UTVs. Whether you need a standard OEM replacement for a daily driver or a high-performance upgrade for your classic Corvette, KEMSO has the solution. The company is committed to providing quality parts that are reliable and trusted by enthusiasts across the country .
To find the right KEMSO fuel pump for your 1958 Corvette, visit their official website: https://www.kemsoracing.com/. Browse their catalog, read product descriptions, and order with confidence knowing that you are backed by a lifetime warranty and USA-based support.
Final Thoughts
The 1958 Corvette is a legendary American sports car, and keeping it running reliably requires attention to every detail, starting with the fuel system. Whether you choose an original-style AC Delco replacement pump or upgrade to a modern KEMSO high-performance unit, the key is to match the pump to your specific engine configuration and driving needs.
For a stock restoration, the correct AC Delco pump for your 1958 Corvette depends on the production date and engine option. For a performance build, KEMSO offers the flow and reliability you need to support increased horsepower. No matter which path you choose, proper installation and regular maintenance will keep your 1958 Corvette on the road for years to come.
Visit KEMSO at https://www.kemsoracing.com/ to find the perfect fuel pump for your 1958 Corvette.