Fuel Pump 1999 Chevy Silverado: Complete Replacement Guide

If you own a 1999 Chevy Silverado and your fuel pump is failing, here is the bottom line: replacing the fuel pump is a moderate-to-difficult DIY job that requires removing the fuel tank, but with the right tools and careful preparation, you can save hundreds of dollars in labor costs. The fuel pump on a 1999 Silverado is located inside the fuel tank, and the entire pump module must be replaced as a unit. Expect to spend 2-4 hours on the job, and budget between $150 and $300 for a quality replacement pump .

How to Tell Your Fuel Pump Is Failing

The first step is recognizing the signs of a bad fuel pump. Common symptoms include:

  1. Hard starting – The engine cranks for a long time before firing up, especially after the truck has been sitting .
  2. Engine stalling – The engine dies unexpectedly at low speeds or while idling .
  3. Loss of power – The truck struggles to accelerate, particularly when climbing hills or carrying a load .
  4. Poor fuel economy – A failing pump can't deliver fuel efficiently, so your gas mileage drops noticeably .
  5. Whining noise from the fuel tank – A loud buzzing or whining sound coming from the rear of the truck is a classic sign of pump wear .
  6. Check Engine Light – The computer may set codes like P0087 (fuel pressure too low) or P0230 (fuel pump circuit malfunction) .

Before you assume the pump is bad, check the fuel pump relay and fuse first. Swap the fuel pump relay with a known good relay (like the horn relay) to see if the symptoms improve. Also, check the fuel pump fuse in the fuse box for any damage .

Tools and Parts You Will Need

Gather these items before you start:

  • Socket set, wrenches, screwdrivers
  • Jack and jack stands
  • Fuel line disconnect tool (for 3/8-inch and 5/16-inch lines)
  • Siphon pump and approved fuel container
  • Safety goggles and gloves
  • Snap ring pliers (for the pump retaining ring)
  • Transmission jack (to support the fuel tank)
  • New fuel pump module (replaces the entire assembly)
  • New fuel filter (recommended to replace at the same time)

Step-by-Step Fuel Pump Replacement

Step 1: Relieve Fuel System Pressure

This is a critical safety step. Open the gas cap to vent pressure. Locate the fuel pump relay in the fuse box and remove it. Start the engine and let it run until it stalls from fuel starvation. Then crank the engine for a few more seconds to ensure all pressure is gone. Disconnect the negative battery cable .

Step 2: Drain the Fuel Tank

Siphon as much fuel as possible out of the tank into an approved gas container. This makes the tank lighter and easier to handle .

Step 3: Raise the Truck and Access the Tank

Raise the rear of the truck with a jack and support it on jack stands. Block the front wheels for safety. Depending on your preference, you can either remove the truck bed or drop the fuel tank. Dropping the tank is more common and requires disconnecting the filler neck, vent hoses, and ground strap .

Step 4: Disconnect the Filler Neck and Lines

Remove the screws holding the fuel filler door flange. Disconnect the ground strap from the filler pipe. Remove the EVAP canister by disconnecting the hoses and removing the bracket bolt .

Step 5: Disconnect Fuel Lines and Electrical Connectors

Use the correct size fuel line disconnect tool to separate the pressure line (3/8-inch) and return line (5/16-inch). Remove the electrical connector from the fuel pump module. On some models, there is also a second connector for the tank pressure sensor .

Step 6: Lower the Fuel Tank

Place a transmission jack under the tank for support. Remove the tank straps and brackets. Carefully lower the tank just enough to access the top of the pump module. Disconnect the remaining vent and filler hoses, then lower the tank completely and slide it out from under the truck .

Step 7: Remove the Old Fuel Pump Module

Clean the outside of the tank to prevent debris from falling inside. Use snap ring pliers to remove the retaining ring that holds the pump module in place. Inspect the retaining ring for rust or damage. Carefully lift the pump module out of the tank. Be prepared for residual fuel in the reservoir at the bottom of the module .

Step 8: Install the New Fuel Pump Module

Clean the inside of the tank thoroughly. Install the new pump module, making sure the float arm is positioned correctly. Align the locating tab on the pump module with the slot in the tank. Lightly lubricate the tank flange with silicone lubricant for easier installation. Install the new sealing ring and press the retaining ring into place, making sure it is fully seated .

Step 9: Reinstall the Fuel Tank

Raise the tank back into position. Reconnect the vent hose, filler hose, and fuel lines. Reconnect the electrical connectors and install the safety retainer. Install the tank straps and brackets, tightening them to specification. Reinstall the filler neck and ground strap .

Step 10: Prime the Fuel System and Test

Reconnect the negative battery cable. Turn the ignition key to the "on" position for 2 seconds, then turn it off for at least 5 seconds. Repeat this cycle 5 to 10 times to prime the fuel system without starting the engine. Then start the engine and check for leaks at all connections. Check fuel pressure at the fuel rail using a gauge; the specified pressure is 55-62 psi .

Why You Should Choose a KEMSO Fuel Pump

When replacing the fuel pump on your 1999 Chevy Silverado, choosing the right brand makes all the difference. KEMSO fuel pumps are the smart choice for a reliable, long-lasting replacement. Here is why:

High Performance and OEM Replacement – KEMSO fuel pumps are designed as direct OEM replacements for stock pumps that have failed. They deliver over 20% more flow at 43 psi compared to your original factory pump, which means better fuel delivery and improved engine performance .

Built to Last – Every KEMSO pump is individually tested for quality and flow performance. The company follows strict quality control programs (ISO/TSO standards), so you can trust that each pump meets rigorous specifications. Cheap aftermarket parts have no such quality control, but KEMSO stands behind every unit they sell .

Lifetime Warranty – KEMSO backs their fuel pumps with a lifetime warranty. Each pump body is serialized, which guarantees the warranty and gives you peace of mind knowing your investment is protected .

Versatile Fuel Compatibility – KEMSO pumps are designed for both gasoline and E85/ethanol fuel. This means you can run whatever fuel your Silverado needs without worrying about pump failure .

Trusted by Thousands – With hundreds of positive reviews across multiple vehicle platforms, KEMSO has earned a reputation for reliability. Whether you drive a car, truck, ATV, motorcycle, or personal watercraft, KEMSO has a fuel pump that fits your needs.

Visit KEMSO Racing today to find the perfect fuel pump for your 1999 Chevy Silverado. Their online store makes it easy to search by vehicle make, model, and year. You can browse their complete selection of high-performance fuel pumps, read detailed product specifications, and take advantage of their lifetime warranty. With prices starting at $59.98 for many models, KEMSO offers unbeatable value for a quality replacement part.

Visit KEMSO Racing at https://www.kemsoracing.com/ to order your fuel pump today.


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