Parts for your 2017 Nissan Pulsar-Fuel cap

2017 Nissan Pulsar fuel cap — purpose, care and when to replace

Based on technical references — including the Nissan Pulsar C12 Owner’s Manual (Fuel-filler cap section) and the Nissan C12/B17 Service Manual (Fuel/Evap system) — the 2017 Nissan Pulsar is fitted with a conventional screw-on, tethered fuel-filler cap. These factory documents outline removal and installation (“turn until it clicks”), storage of the cap in the filler-door holder, and how an improperly sealed cap can trigger an evaporative emissions leak fault and the check engine light. This confirms the fuel cap is relevant and used on the 2017 Pulsar.

On this model, the fuel cap does a deceptively big job. It seals the tank to stop petrol fumes venting to the atmosphere, keeps water and dust out, and allows the EVAP system to control vapour pressure properly. If the cap’s seal hardens or the cap isn’t tightened until it clicks, the car can log EVAP leak codes and light the MIL, you might notice a whiff of fuel, and refuelling may take longer due to venting issues.

Servicing the Pulsar? It’s worth giving the cap a quick once-over. The cap itself is a wear item — not on a fixed schedule, but it does age. A genuine, EVAP-rated replacement keeps the emissions system happy and avoids nuisance warning lights.

• Tightening: After refuelling, turn the cap clockwise until it clicks. Don’t reef on it past the clicks — the ratchet prevents over-tightening.
• Seal inspection: Check the rubber O-ring for cracks, flattening, or swelling. Replace the cap if the seal’s tired.
• Cleanliness: Wipe dust or grit from the filler neck and cap seal. Grit can compromise the seal and cause small leaks.
• Warnings: A “check engine” light after a recent fill-up? Make sure the cap’s on and clicked. If the light persists, the cap may be faulty or there’s another EVAP leak.
• Replacement choice: Use a cap specified for the 2017 Pulsar (C12 hatch or B17 sedan). Genuine or high-quality aftermarket caps must be EVAP-compatible and vent correctly.

There’s no hard-and-fast replacement interval, but if the cap’s tether is broken, the ratchet no longer clicks, the seal looks shot, or you’re chasing recurring EVAP codes related to a small leak, a new cap is cheap insurance. It’s a quick fit and can save time on diagnostics, help pass WOF/rego checks, and keep fuel smells at bay.

Popular questions

1) Will a loose fuel cap really cause a check engine light on a 2017 Pulsar?
Yes. The Pulsar’s EVAP system pressure-tests the tank and lines. A loose or leaking cap looks like a small vapour leak, which can set EVAP fault codes and light the MIL. First step: remove and refit the cap until it clicks, then drive a few trips for the system to recheck.

2) What fuel cap should be used when replacing on a 2017 Nissan Pulsar?
Choose a cap specified for the 2017 Pulsar (C12/B17), petrol, EVAP-rated and vented as per OEM design. A genuine Nissan unit or a quality aftermarket cap listed for your VIN is the safe bet. Avoid generic non-vented caps — they can upset tank pressure and trigger EVAP faults.

3) How often should the fuel cap be replaced?
There’s no fixed interval. Inspect it during regular services. Replace if the seal is cracked or flattened, the ratchet doesn’t click, the tether’s broken, you smell fuel around the filler, or EVAP small-leak codes keep coming back after refitting.