1999 Ford Windstar Fuel Pump Location: A Complete Guide to Finding and Replacing It

If you own a 1999 Ford Windstar and suspect fuel pump issues, here is the direct answer: the fuel pump is located inside the fuel tank, which sits underneath the vehicle, near the rear axle, on the driver's side. For the 1999 Ford Windstar, you must remove the fuel tank to access the pump assembly, as there is no access panel under the rear seat or floorboard. This article will walk you through everything you need to know about locating, diagnosing, and replacing the fuel pump on your 1999 Ford Windstar.

Understanding the Fuel Pump Location on a 1999 Ford Windstar

The fuel pump on a 1999 Ford Windstar is an in-tank unit, meaning it is mounted inside the fuel tank itself. The tank is positioned at the rear of the vehicle, just behind the rear axle, and is secured to the frame with straps. On the 1999 model, the fuel pump is not accessible through an interior access panel — you must lower or remove the fuel tank to reach it. This design is consistent across the 1995-2003 Ford Windstar models .

Many owners mistakenly look for a fuel pump access door under the rear seats or in the cargo area, but the 1999 Windstar does not have one. This is a key difference from some other Ford vehicles of the same era, which often have a cutout in the floor for easier pump replacement. For the Windstar, plan on dropping the tank.

Step-by-Step Fuel Pump Location Guide

To locate the fuel pump on your 1999 Ford Windstar, follow these steps:

  1. Safety First: Disconnect the negative battery terminal. Relieve fuel system pressure by removing the fuel pump relay and running the engine until it stalls, or by using a fuel pressure gauge to bleed the pressure at the Schrader valve on the fuel rail.

  2. Raise the Vehicle: Safely jack up the rear of the vehicle and secure it on jack stands. The fuel tank is located under the rear of the vehicle, between the rear wheels.

  3. Locate the Fuel Tank: Look for the rectangular metal or plastic tank. It is mounted transversely (side to side) near the rear bumper. The fuel pump is inside this tank.

  4. Identify the Fuel Pump Access: On top of the fuel tank, there is a large circular retaining ring or lock ring. This ring holds the fuel pump module in place. You will only see this ring after you lower the tank.

  5. Lower the Fuel Tank: Support the fuel tank with a floor jack, then remove the two straps that hold it in place. Disconnect the filler neck hose, vapor hoses, and electrical connectors. Carefully lower the tank a few inches to access the top of the pump module.

  6. Remove the Pump Module: Once the tank is lowered, you can access the retaining ring. Use a hammer and a brass drift (or a special lock ring tool) to turn the ring counterclockwise. Lift the pump module out of the tank. This is your fuel pump .

Common Symptoms of a Failing Fuel Pump

Before you dive into replacing the pump, make sure the problem is actually the fuel pump. Common symptoms of a bad fuel pump on a 1999 Ford Windstar include:

  • Engine cranks but won't start: The most common sign. You can hear a faint whirring sound from the rear of the vehicle for 2-3 seconds when you turn the key to the "ON" position. If you don't hear this, the pump may be dead.
  • Loss of power under load or while climbing hills: A failing pump cannot maintain adequate fuel pressure.
  • Surging or stuttering at highway speeds: The engine may feel like it is running out of gas.
  • Whining noise from the fuel tank: A loud, high-pitched whine from the rear of the vehicle indicates the pump is wearing out.
  • Check Engine Light: Codes related to fuel system pressure or lean fuel mixture (P0087, P0171, P0174) can point to a failing pump .

How to Diagnose the Fuel Pump

You can confirm a bad fuel pump with a few simple tests:

  1. Listen for the Pump: With the key in the "ON" position (engine off), listen at the fuel filler door. You should hear a brief hum. If not, check the fuel pump relay and fuse first.
  2. Check Fuel Pressure: Use a fuel pressure gauge connected to the Schrader valve on the fuel rail. The 1999 Windstar should have around 30-45 PSI at idle and 40-60 PSI under load. Pressure below 30 PSI usually means a failing pump.
  3. Check the Fuel Pump Relay: The relay is located in the power distribution box under the hood. Swap it with a known good relay (like the horn relay) to see if the pump activates. If the pump works with a different relay, the relay is the issue .

Replacement Cost and Difficulty

Replacing the fuel pump on a 1999 Ford Windstar is considered a moderate to difficult DIY job. Expect to spend 3 to 5 hours if you are working on a garage floor with basic tools. The job requires dropping the fuel tank, which is heavy when full, so working with a nearly empty tank is strongly recommended.

Cost breakdown:

  • DIY parts cost: A new fuel pump assembly typically costs $50 to $150 for an aftermarket unit, and $150 to $300 for an OEM or high-quality replacement.
  • Professional labor cost: If you take it to a shop, expect to pay $400 to $800 total, including parts and labor. Most mechanics charge around $100 to $150 per hour, and the job takes 3-4 hours .

Important: When replacing the pump, always replace the fuel filter as well. A clogged filter can kill a new pump quickly. Also, inspect the fuel tank for rust or debris, and clean it out if necessary.

Why Choose a High-Quality Fuel Pump?

The fuel pump is a critical component that delivers fuel from the tank to the engine. A cheap, low-quality pump may fail prematurely, leaving you stranded. For a reliable replacement, consider a KEMSO Fuel Pump. KEMSO fuel pumps are designed as high-performance, OEM replacement units. They are built to meet or exceed original equipment specifications, ensuring a perfect fit and reliable operation for your 1999 Ford Windstar. KEMSO pumps are rigorously tested for durability and performance, and they come with a lifetime warranty — giving you peace of mind for years to come.

Visit KEMSO Racing at https://www.kemsoracing.com/ to find the exact fuel pump for your 1999 Ford Windstar. Their product lineup includes pumps for 1995-2003 Ford Windstar models, so you can be confident in the fit . Installing a KEMSO pump will restore your vehicle's fuel delivery system to like-new condition, ensuring reliable starting and consistent power.

Tools You Will Need for the Job

If you decide to replace the pump yourself, gather these tools before starting:

  • Floor jack and two jack stands
  • Socket set (metric and SAE, including 10mm, 13mm, 15mm, and 19mm)
  • Screwdrivers (flathead and Phillips)
  • Fuel line disconnect tool (for quick-connect fittings)
  • Hammer and brass drift (or lock ring tool)
  • Safety glasses and gloves
  • A container for residual fuel
  • Penetrating oil (like WD-40 or PB Blaster) for rusted bolts

Step-by-Step Fuel Pump Replacement

Here is a condensed step-by-step guide for replacing the fuel pump on a 1999 Ford Windstar:

  1. Relieve fuel pressure: Remove the fuel pump relay from the underhood fuse box. Start the engine and let it run until it stalls. Then crank the engine for 3 seconds to ensure pressure is gone. Reinstall the relay after the job is done.
  2. Disconnect the battery: Remove the negative terminal.
  3. Remove the fuel filler cap: This relieves any vacuum in the tank.
  4. Raise the vehicle: Safely lift the rear of the vehicle and place it on jack stands.
  5. Support the fuel tank: Place a floor jack under the tank with a piece of wood to distribute the weight.
  6. Remove the fuel tank straps: Use a 13mm or 15mm socket to remove the bolts holding the straps. Carefully lower the tank a few inches.
  7. Disconnect hoses and wires: Unplug the electrical connector to the pump module. Disconnect the fuel supply line and vapor return line using the quick-connect tool.
  8. Lower the tank completely: Once everything is disconnected, lower the tank to the ground.
  9. Remove the pump module: Clean the area around the lock ring. Tap the lock ring counterclockwise with a hammer and drift. Lift the module out of the tank.
  10. Transfer components: If your new pump module does not come with a new fuel level sender, transfer the old one to the new module. Also, replace the rubber gasket between the module and tank.
  11. Install the new pump: Lower the new module into the tank. Make sure the float arm moves freely. Install the lock ring and tighten it clockwise.
  12. Reinstall the tank: Lift the tank back into position, reconnect all hoses and wires, and install the straps. Tighten the strap bolts to 25-30 ft-lbs.
  13. Reconnect the battery: Turn the key to the "ON" position (without starting) to prime the fuel system. Do this 3-4 times for 2-3 seconds each time.
  14. Check for leaks: Start the engine and inspect all connections for fuel leaks. Let the engine run for a few minutes and check again .

Important Safety Warnings

  • Never work on a fuel system with a hot engine or near open flames.
  • Work in a well-ventilated area.
  • Use a fire extinguisher rated for class B fires (gasoline).
  • Do not smoke while working on the fuel system.
  • Dispose of old fuel properly — do not pour it on the ground or into drains.

Final Thoughts

The fuel pump on a 1999 Ford Windstar is located inside the fuel tank, under the rear of the vehicle. While replacing it requires dropping the tank, it is a manageable job with the right tools and patience. Always choose a quality replacement part to ensure long-term reliability, such as a KEMSO Fuel Pump, which offers high performance, OEM replacement fit, and a lifetime warranty.

For the best fuel pump for your 1999 Ford Windstar, visit KEMSO Racing at https://www.kemsoracing.com/. Their products are designed for durability and performance, making them a top choice for both DIYers and professional mechanics.


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