10th Gen Civic In Tank Fuel Pump Install Guide

Congratulations and thank you for your purchase of the Wunderladen Racing plug n play in tank fuel pump upgrade for your 10th Generation Honda Civic! This guide will cover all steps to install this product on your vehicle and hopefully answer any questions you may have related to it. If you have any questions that this guide does not cover, please contact us via email at 


What’s Included:

  • (1) AEM 340LPH ethanol rated fuel pump
  • (1) Fuel pump wiring harness
  • (1) Fuel pump filter
  • (2) Fuel pump o-ring
  • (1) Evap hose clip

Required Tools:

  • Ratchet
  • 10mm socket
  • 12mm socket
  • Plastic trim tool
  • Phillips head screwdriver
  • Small flathead screwdriver
  • Long 1/2" breaker bar or ratchet
  • Fuel pump tophat lock ring tool (OEMTOOLS 24398 or equivalent)
  • Hose grip pliers
  • Needle nose pliers
  • O-ring grease (or similar grease)

Installation Steps:

  1. Remove the rear seat bench. There is one 10mm bolt that must be removed at the rear of the bench where it meets the seatback on the driver side, you will need to pull aside the cushion to access it. Then there are two locking mechanisms at the front of the bench underneath it where it meets the carpet. You must pull the white locks towards the front of the car to release the bench. After that the bench can be removed and the seat backs folded down.
  2. For hatchbacks (sedans and coupes can skip this step) disconnect the flaps that connects the seat back to the trunk floor. The two cargo tie downs must be removed first. Using a small flathead screwdriver pry up the cover and remove the screw with a phillips head screwdriver. After that there are some christmas tree clips on both seat backs which must be pulled up, using a trim tool helps to keep from damaging the clips.
  3. Remove the passenger side seat back. To remove the passenger side seat back there is one 12mm bolt on the outboard side of the seat and two 12mm bolts on the inboard side of the seat. Once these three bolts are removed the passenger side seat back can be removed from the car.
  4. Remove the driver side seat back. To remove the driver side seat back there is one 12mm bolt in the side of the seat back that faces the passenger side seat back and two 12mm bolts on the outboard side of the seat. Once these three bolts are removed the driver side seat back can be removed from the car.
  5. Now you should be looking at the fuel pump access panel. To remove it you will need to use a phillips head screwdriver to turn the four fasteners 90° to align with the slotted holes in the panel. Pry the panel up, it has a seal on it so it may require a bit of force but be careful not to bend the panel or pull it too far as the connector for the fuel pump and level sender on top of the tophat must be disconnected to fully swing the access panel out of the way.
  6. With the electrical connector disconnected you should have unobstructed access to the fuel pump tophat. Before removing anything we strongly suggest cleaning off the top of the fuel tank and tophat with some degreaser to avoid letting dirt fall into the fuel tank when the tophat is removed.
  7. Begin disconnecting the three hoses that go into the tophat. The fuel feed line (lower left) is removed by pinching the light blue clip together and pulling the line off. The fuel tank vent hose (top left) is removed by pinching the two green tabs together and pulling the hose off. The evap purge line is removed by pushing the hose towards its barb on the tophat and using a small flathead screwdriver to pop up and remove the retaining clip (has a green mark on it in the photo). When we were removing it on our car we ended up breaking this clip so we include a replacement clip to save you the trouble of having to track down the right one in case yours breaks too, Honda does not sell this clip separately. The fuel tank vent hose and the evap purge line will not be able to be fully removed from the tophat at this time, they just need to be disconnected, once the tophat is able to be lifted they can be removed completely.
  8. Remove the tophat retaining ring. To do this you will need to use the tophat retaining ring tool and a long 1/2" breaker bar or ratchet. Turn the tool counterclockwise to loosen the ring. Once the retaining tabs are in the wider areas of the slots the ring can be removed.
  9. With the retaining ring removed the tophat can be lifted. There is a fuel tank vent hose connected to the underside of the tophat as well which must be disconnected before the tophat can be removed from the vehicle. The hose is released just like the vent hose on the topside of the tophat but access is much tighter so using hose grip pliers makes this task much easier.
  10. With the underside vent hose removed the fuel pump basket assembly can be removed from the vehicle. The basket will be fairly full of fuel so we recommend tipping it over and draining as much as you can into the open tank. It is a good idea to cover the open tank while you are working on the fuel pump basket out of the car. Before you start disassembling the fuel pump basket assembly be sure to note the routing of the wires for the fuel pump and level sender. Use the picture below as a reference or take your own.
  11. Disassemble the fuel pump basket assembly. Begin by disconnecting the fuel level sensor and fuel pump connectors on the underside of the tophat and unclipping them from their tie downs. Next push the tophat down on the basket and remove the circlip from guide rod with the spring using needle nose pliers, this will allow the tophat to be removed from the basket.
  12. Now you will need to remove the fuel pump assembly from the basket. First you will disconnect the suction tube from the bottom of the basket with a small flathead screwdriver. The corrugated piping must be unclipped from the channel it snaps into as well. After that there are three clip tabs that retain the fuel pump assembly to the basket at the top of the basket. These can be lifted up with a small flathead screwdriver and then the fuel pump assembly can be removed.
  13. With the fuel pump assembly removed from the basket you can now remove the fuel pump from the assembly housing. To do this use a small flathead screwdriver to unhook the three blue clip tabs on the filter that retain it to the assembly housing. With those clips released the fuel pump can be removed from the housing. Be sure to remove the white plastic spacer underneath the o-ring as you will need to reuse this on the new pump.
  14. Begin dressing the new fuel pump for installation to the assembly housing. Install the fuel pump filter onto the bottom of the pump, it only installs correctly in one orientation. Put the plastic spacer over the outlet of the pump at the top and install ONE o-ring above it. We include two o-rings with the pump so you have a spare in case the first one gets torn or damaged upon installation. Apply a very light coat of o-ring grease (or similar grease) to the o-ring. Plug in the new wiring harness to the pump and install the dressed pump in the assembly housing.
  15. Reverse the disassembly process of steps 11-13 to reassemble the fuel pump basket and tophat assembly. Be sure to route the wires the same as they were before. Note: pay attention to where the new fuel pump filter is landing when you install the housing assembly back into the basket, the fuel pump filter can land in a position that doesn't allow the three top clips of the housing assembly to clip back into the basket, when it lands correctly it will be a tight fit to get the clips to reseat but it should not take excessive force to do so.
  16. Reverse the disassembly process of steps 7-10 to reinstall the fuel pump basket and tophat assembly back into the car. Be sure to slide the topside fuel tank vent hose and purge line part way onto their ports on the tophat before you fully compress the tophat back on the tank and tighten the lock ring. Also, when reinstalling the clip for the purge line it should be oriented as shown below with the tangs towards the end of the hose in their slot.
  17. Now is a good time to check for leaks. Plug the fuel pump connector back into the tophat and turn the key from the OFF position to the ON position 4-6 times to prime the fuel system and build fuel pressure. Check the tophat and all the hoses to make sure there are no leaks. If that is all good then start the car to make sure it runs properly before putting everything else back together.
  18. Reverse steps 1-6 to reinstall the fuel tank access panel and rear seats back into the car. Congratulations you've successfully installed our plug n play in tank fuel pump upgrade to your 10th generation Civic!
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