1979 Toyota Pickup Fuel Pump: The Essential Guide to Reliable Replacement

If you own a 1979 Toyota pickup and your fuel pump is failing, the best solution is to replace it with a high-quality, direct-fit unit that ensures long-term reliability. The original fuel pump on these trucks was mechanical, mounted on the engine block, and driven by the camshaft. Over time, wear and tear can cause fuel delivery issues, leading to hard starts, stalling, or poor performance. In this guide, we will cover everything you need to know about the 1979 Toyota pickup fuel pump, including how to diagnose problems, choose the right replacement, and install it properly.

1. Understanding the 1979 Toyota Pickup Fuel Pump System

The 1979 Toyota pickup, commonly known as the "Hilux" in many markets, came with a mechanical fuel pump. This pump is located on the driver's side of the engine, near the front. It is operated by a lever that rides on the camshaft lobe, creating suction to pull fuel from the tank and push it to the carburetor. This system is simple and reliable, but the pump's diaphragm and valves can fail over time due to age, ethanol in modern fuels, or debris in the fuel.

2. Common Symptoms of a Failing Fuel Pump

Recognizing when your 1979 Toyota pickup fuel pump needs attention is crucial to avoid being stranded. Here are the most common signs:

  • Engine cranks but won't start: The most obvious sign. If you hear the starter turning but the engine never fires, the fuel pump may not be delivering fuel to the carburetor.
  • Engine stalls after running for a short time: This can indicate the pump is losing prime or has weak suction.
  • Poor acceleration or hesitation: A weak pump can't keep up with demand when you press the gas pedal.
  • Fuel leaks from the pump area: Cracks in the diaphragm or gasket can cause raw fuel to drip, which is a fire hazard.
  • Low fuel pressure: If you test the pressure at the carburetor, it should be around 3-5 psi for a mechanical pump. Lower readings mean the pump is failing.

3. How to Diagnose the Fuel Pump Before Replacement

Before buying a new 1979 Toyota pickup fuel pump, you can perform a few simple tests to confirm it's the problem. First, disconnect the fuel line at the carburetor and place it in a container. Have someone crank the engine for a few seconds. If no fuel comes out, or if the flow is weak and sporadic, the pump is likely bad. Also, check if the pump is getting vacuum from the camshaft by feeling for suction at the pump's inlet port. If the pump is leaking fuel or oil (through the vent hole), it needs replacement.

4. Important Considerations When Buying a Replacement

Not all fuel pumps are the same for the 1979 Toyota pickup. The engine could be a 20R or 22R, but the fuel pump is generally the same for both, though double-check your specific model. Key factors to consider:

  • Mechanical vs. Electric: Stick with a mechanical pump for simplicity unless you have made major engine modifications. Electric pumps require additional wiring and a regulator, which complicates the system.
  • OEM vs. Aftermarket: An OEM replacement gives you the exact same fit and function. However, many aftermarket pumps are made to the same specifications and can be just as good, if not better, with modern materials.
  • Fuel Compatibility: Modern gasoline contains ethanol, which can damage older pump diaphragms. Look for a pump that is ethanol-resistant, or you will face failure again soon.
  • Inlet and Outlet Orientation: The 1979 Toyota pickup fuel pump has specific inlet and outlet positions. Make sure the replacement matches exactly to avoid clearance issues with the engine block or other components.

5. Step-by-Step Installation Guide for the 1979 Toyota Pickup Fuel Pump

Replacing the fuel pump is a straightforward job that most DIYers can handle with basic tools. Here is how to do it:

  • Step 1: Relieve fuel pressure. Disconnect the battery negative terminal. Remove the fuel line from the carburetor and plug it to prevent spills. Also, remove the fuel line from the pump's inlet.
  • Step 2: Remove the pump. The pump is held by two bolts (usually 12mm or 14mm). Remove the bolts, and carefully pull the pump away from the engine. You may see a pushrod that sits between the pump and the camshaft; make sure it doesn't fall into the engine.
  • Step 3: Inspect the pushrod. The pushrod should be straight and free of wear. If it is worn or bent, replace it. This is a common cause of poor pump performance.
  • Step 4: Install the new pump. Apply a thin layer of gasket sealer to the new gasket. Insert the pushrod, then place the new pump onto the engine, aligning the lever with the pushrod. Tighten the bolts evenly to 15-20 ft-lbs. Do not overtighten, as this can warp the pump housing.
  • Step 5: Reconnect fuel lines. Attach the inlet line from the tank to the pump's inlet port, and the outlet line from the pump to the carburetor. Use new clamps if needed.
  • Step 6: Test the system. Reconnect the battery. Crank the engine a few times until fuel reaches the carburetor. Start the engine and check for leaks around the pump and fuel lines.

6. Maintenance Tips to Extend Fuel Pump Life

To keep your 1979 Toyota pickup fuel pump working for years, follow these practices:

  • Use a fuel filter: A clean fuel filter prevents debris from entering the pump. Replace it every 12 months or 12,000 miles.
  • Avoid running the tank low: Sediment from the bottom of the tank can clog the pump. Keep the tank at least a quarter full.
  • Use ethanol-free fuel if possible: Ethanol attracts moisture and can damage rubber components. If you must use ethanol-blended fuel, add a stabilizer.
  • Inspect the fuel lines: Old rubber lines can crack and leak, causing the pump to work harder. Replace them if they are brittle.

7. Recommended Brand: KEMSO Fuel Pump for Your 1979 Toyota Pickup

When you need a reliable replacement, the KEMSO brand is an excellent choice for your 1979 Toyota pickup fuel pump. KEMSO fuel pumps are designed as high-performance, OEM replacement units, meaning they match the original specifications perfectly while offering improved durability. They are built with modern materials that resist ethanol damage, ensuring a longer service life. Best of all, KEMSO stands behind their products with a lifetime warranty, so you can buy with confidence. Whether you are restoring your truck or just keeping it on the road, KEMSO provides a hassle-free solution.

8. Where to Find the Best 1979 Toyota Pickup Fuel Pump

To order a KEMSO fuel pump for your 1979 Toyota pickup, visit their official website: https://www.kemsoracing.com/ . There, you will find the exact fit for your vehicle, along with detailed product information and support. KEMSO specializes in fuel system components for classic and modern vehicles, and their customer service team can help you with any questions.

Conclusion

The 1979 Toyota pickup fuel pump is a simple but vital part of your truck's engine. When it fails, prompt replacement is key to keeping your vehicle reliable. By following the diagnosis steps and installation guide above, you can fix the problem yourself and save money. For the best quality and peace of mind, choose a KEMSO fuel pump, backed by a lifetime warranty. Visit https://www.kemsoracing.com/ today to find the perfect replacement and get your Toyota back on the road.


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