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How To Replace Mustang Fuel Pump | 1986-97

Created by Taylor Ward
Last Updated 10/6/2021

Working on your fuel system can be a pain. LMR walks you through the steps needed on how to remove and install a 1986-97 Mustang Fuel Pump.

Viewing this install and using the information shared is subject to the terms set forth here - View the LMR Install Instructions Disclaimer.

FOLLOW: mustang , 79 93 mustang , 94 04 mustang , fuel system , fuel pump , removal , installation

How To Replace Mustang Fuel Pump | 1986-97 - How To Replace Mustang Fuel Pump | 1986-97

Jump To: Removal | 155LPH Install | 255LPH Install

In this article, LMR shows you how to remove and replace the fuel pump covering all 1986-1997 Mustang applications. Whether you walk out to your ride and experience a no-start condition or are prepping your fuel system for an upgrade, installing a fuel pump is a common service part that is needed for all Mustangs. Dropping in a new pump is an easy task to accomplish.

Follow along, and we will show you the step-by-step instructions to knock this one out. Overall this one should take you roughly 1-2 hours to complete.

Tools Needed

  • lift or jacks & jack stands
  • socket set
  • hammer
  • assorted screwdrivers
  • wire strippers
  • wire crimp tool
  • needle-nosed pliers
  • fuel disconnect tools
  • heat gun or torch

86-97 Mustang Fuel Pump Removal Steps


  1. Start by removing the fuel tank from the vehicle. If you need to know how to complete this task check out our 83-97 Mustang fuel tank removal article.
  2. How To Replace Mustang Fuel Pump | 1986-97 - How To Replace Mustang Fuel Pump | 1986-97

  3. Once you have the tank out, take this to a clean work surface. Remove the plastic retaining clip holding the main 5/16" supply line with a small flat-bladed screwdriver.
  4. How To Replace Mustang Fuel Pump | 1986-97 - How To Replace Mustang Fuel Pump | 1986-97

  5. Next, using a fuel line disconnect tool, remove the 1/4" return line.
  6. How To Replace Mustang Fuel Pump | 1986-97 - How To Replace Mustang Fuel Pump | 1986-97

  7. Disconnect the electrical connector.
  8. How To Replace Mustang Fuel Pump | 1986-97 - How To Replace Mustang Fuel Pump | 1986-97

  9. Using a flat-bladed screwdriver or a punch, tap the lock ring out of place. Once this is off, you can remove the fuel pump bracket from the tank.
  10. How To Replace Mustang Fuel Pump | 1986-97 - How To Replace Mustang Fuel Pump | 1986-97
    How To Replace Mustang Fuel Pump | 1986-97 - How To Replace Mustang Fuel Pump | 1986-97

86-97 Mustang 155LPH or Stock Fuel Pump Installation & Wiring Steps

We will be installing a new fuel pump hanger bracket on our application at this time. These same steps can be used if you will be reusing the factory bracket.


  1. First, remove both of the pump bracket screws.
  2. How To Replace Mustang Fuel Pump | 1986-97 - How To Replace Mustang Fuel Pump | 1986-97

  3. Take both of the red protective caps off of the pump inlet and outlet.
  4. How To Replace Mustang Fuel Pump | 1986-97 - How To Replace Mustang Fuel Pump | 1986-97

  5. Install the rubber isolator and then you can test fit the pump into the bracket.
  6. How To Replace Mustang Fuel Pump | 1986-97 - How To Replace Mustang Fuel Pump | 1986-97

  7. Next, test measure your S-hose and trim accordingly. Make sure there are no kinks or bends and that it will allow the fluid to flow adequately.
  8. How To Replace Mustang Fuel Pump | 1986-97 - How To Replace Mustang Fuel Pump | 1986-97

  9. Place your clamps on your S-hose and slide the hose onto the pump side first.
  10. How To Replace Mustang Fuel Pump | 1986-97 - How To Replace Mustang Fuel Pump | 1986-97

  11. Now you can fully tighten the clamp on the pump side.
  12. How To Replace Mustang Fuel Pump | 1986-97 - How To Replace Mustang Fuel Pump | 1986-97

  13. Place the pump back in the hanger and then slide the S-hose back onto the bracket side and fully tighten the clamp.
  14. How To Replace Mustang Fuel Pump | 1986-97 - How To Replace Mustang Fuel Pump | 1986-97

  15. Reinstall both of the bracket screws.
  16. How To Replace Mustang Fuel Pump | 1986-97 - How To Replace Mustang Fuel Pump | 1986-97

  17. Press on the fuel filter sock at this time.
  18. How To Replace Mustang Fuel Pump | 1986-97 - How To Replace Mustang Fuel Pump | 1986-97

  19. Using a pair of needle-nosed pliers, attach each of the electrical terminals. You can see the differences here in the terminals’ size, but the pump is also clearly marked with a plus for positive and a minus for negative.
  20. How To Replace Mustang Fuel Pump | 1986-97 - How To Replace Mustang Fuel Pump | 1986-97

  21. Once this is connected, you are all done and can reinstall the assembly back in the tank.
  22. How To Replace Mustang Fuel Pump | 1986-97 - How To Replace Mustang Fuel Pump | 1986-97

86-97 Mustang 255LPH Fuel Pump Wiring Steps

Moving over to the larger 255 liters per hour style pump, you can see the apparent size difference and the differences between the electrical connectors. All of the general installation steps will be the same other than the electrical portion.


  1. Now we can test the length of the wiring. Set each end of the factory wiring next to the supplied connector. Snip each of the wires at this time.
  2. How To Replace Mustang Fuel Pump | 1986-97 - How To Replace Mustang Fuel Pump | 1986-97

  3. Strip each end of the wire and twist them to sit in the provided butt connector to sit flush. You can cut off any excess wire if you stripped off too much.
  4. How To Replace Mustang Fuel Pump | 1986-97 - How To Replace Mustang Fuel Pump | 1986-97

  5. Using a crimp tool, attach one side of the butt connector and secure it to the wire. Do the same for the other wire.
  6. How To Replace Mustang Fuel Pump | 1986-97 - How To Replace Mustang Fuel Pump | 1986-97

  7. Moving to the supplied connector we cut, strip these wires as well. This next step is not necessary, but we used a couple of small sections of heat shrink to make the connections look better and provide extra strength to the connection once completed.
  8. How To Replace Mustang Fuel Pump | 1986-97 - How To Replace Mustang Fuel Pump | 1986-97

  9. Slide the heat shrink over the wire, then crimp the other side of the butt connector to the wire.
  10. How To Replace Mustang Fuel Pump | 1986-97 - How To Replace Mustang Fuel Pump | 1986-97

  11. Slide the heat shrink over the butt connector and, using a heat gun, apply heat until it shrinks up to the wiring. Be sure to do this for both wires.
  12. How To Replace Mustang Fuel Pump | 1986-97 - How To Replace Mustang Fuel Pump | 1986-97

  13. Plug in the connector to the pump, and then you can set this back in the housing.
  14. How To Replace Mustang Fuel Pump | 1986-97 - How To Replace Mustang Fuel Pump | 1986-97

  15. With the assembly fully tightened down, press on the fuel filter sock at this time.
  16. How To Replace Mustang Fuel Pump | 1986-97 - How To Replace Mustang Fuel Pump | 1986-97
    How To Replace Mustang Fuel Pump | 1986-97 - How To Replace Mustang Fuel Pump | 1986-97

  17. Once this is connected, you are all done and can reinstall the assembly back in the tank.
  18. How To Replace Mustang Fuel Pump | 1986-97 - How To Replace Mustang Fuel Pump | 1986-97

  19. Fold the sock assembly into the opening on the tank and slide the bracket back in the tank at this time.
  20. How To Replace Mustang Fuel Pump | 1986-97 - How To Replace Mustang Fuel Pump | 1986-97

  21. You can use the filler neck hole on the side of the tank to help you align the pump with the internal baffle on the inside of the tank.
  22. How To Replace Mustang Fuel Pump | 1986-97 - How To Replace Mustang Fuel Pump | 1986-97

  23. Slide the new O-ring back on, and then the lock ring. Fully seat the lock ring at this time.
  24. How To Replace Mustang Fuel Pump | 1986-97 - How To Replace Mustang Fuel Pump | 1986-97

  25. Check over your work, and now you are all done!

We hope that this article has helped you and you have a better understanding of how to replace your fuel pump in your 86-97 Mustang.


As always, make sure to keep it here with the Real Mustang Enthusiasts at LMR.com.

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About the Video

How To Remove & Install 1986-97 Mustang Fuel Pump

Check out our YouTube channel for even more tech tips, installation videos, how-tos, and more. The best place to go for anything Mustang related!

Published on 2021-08-04
Working on your fuel system can be a pain, especially when you have to drop your fuel tank. But don't worry, Jay is going to walk you through the step-by-step process on how to remove & install 1986-97 Mustang fuel pump on your Fox Body and early model SN95!

1986-97 Fuel Pumps: https://latemodelres.to/1986-97_FuelPumps_YT

Fuel Tank Removal: https://youtu.be/wOeqAulc6uM

0:00 | Intro
0:28 | Tools Needed for Install
0:52 | Fuel Tank & Pump Removal
1:27 | Fuel Pump Install
2:38 | Fuel Pump Wiring
5:04 | Reinstall Fuel Pump Back Into Tank
5:30 | Final Thoughts

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Use of this video is subject to the terms as set forth in our LMR Install Video Disclaimer | https://lmr.com/page/lmr-install-video-disclaimer