Honda Civic Type R (FN2) In-Tank Fuel Filter and Pump Replacement

Leave the vehicle undisturbed for at least a day beforehand, and avoid switching the ignition to the key-on position, because energising the pump repressurises the lines and produces a larger spill when they are opened. Run the tank close to empty so there is little fuel to lose, and keep a few litres in a can ready to refill afterward, since an open tank loses fuel to evaporation quickly. Work outdoors or in a space with strong airflow, keep every flame, spark and cigarette well clear, and lay out rags plus a container to catch what escapes.

The access hatch for the in-tank assembly sits beneath the center console. Prise off the four plastic trim caps that hide the fixings, then undo the bolts underneath, noting that these fasteners take a 5/16 imperial socket rather than a metric size. Raise the forward edge of the console, unplug the cigarette-lighter connector so nothing is under tension, and lift the console clear. Stow it somewhere safe, such as the boot, while you work.

With the console out of the way, unscrew the metal access panel that caps the top of the pump unit and lift it off. Before disturbing anything further, wipe the exposed top face of the assembly with a slightly damp, lint-free cloth. This removes the film of dust that settles there so grit cannot fall into the open tank once the lines are released. Keep any removed screws well away from the opening.

Unclip the electrical connector feeding the pump, then release the fuel supply line. Expect fuel to weep out as the couplings part, so hold a rag underneath and keep it off the cabin trim and seats. Fuel-resistant gloves keep petrol off your skin. Once the connections are free the assembly is no longer tethered to the car.

Withdraw the combined filter, strainer and pump unit, tilting it as needed to clear the aperture. Note its orientation for reassembly. Expect the base to be wet and to bring up some sediment; owners in the thread routinely found a fair amount of debris in the pot, which is normal on higher-mileage cars and part of why the change is worthwhile.

The replacement is supplied as a bare housing, so the serviceable hardware moves across from the old unit: the fuel pump, its strainer sock, and the small silver pressure regulator (the part several people mistook for a mystery valve). Detach each from the old body and fit it to the new one. Leaving the clamp in place on the regulator while you work the new retaining clip on with pliers makes that connection far easier to seat.

The original writeup inserted the assembly and added the large rubber seal afterward, but the follow-up discussion settled firmly on the reverse as far easier. Seat the new grommet into the rim of the tank aperture on its own first, making sure no rubber overhangs the edge. Done this way the assembly drops home with a fraction of the effort, and the seal stops popping back out mid-fit.

Guide the unit through the seated seal. It will initially feel as though it stands too proud; that is expected, because it presses downward against internal springs until it beds in. Push it firmly straight down until it settles fully. With the seal fitted first, it should hold its position on its own rather than springing straight back out.

Fit the threaded retaining ring that locks the assembly down. This is the single most awkward part of the whole job: it has to be pressed down and turned at the same moment to catch the thread, and a proper cap spanner makes a real difference. Several people found the new ring supplied in the kit fought them and reused the original instead, which threaded on more willingly, so keep the old cap to hand as a fallback.

Reconnect the fuel line and electrical plug, confirming the line is fully latched. Switch the ignition on without cranking and listen: the pump should audibly run and build pressure. Then start the engine. Because opening the lines admitted air, you may have to cycle the ignition a few times, pausing to let the pump prime on each cycle, before it fires cleanly. If it will not start, recheck every connection before reassembling.

Once the engine runs and no leaks show around the fittings, refit and secure the metal access panel. Reconnect the cigarette-lighter plug, lower the center console back into place, and refit its bolts and the four trim caps. Wipe up any residual fuel and let the area air out before driving.