Parts for your 1999 Nissan Pulsar-Fuel cap

1999 Nissan Pulsar fuel cap — purpose, care, and when to replace

The 1999 Nissan Pulsar (N15 series) is built with a conventional, sealed fuel filler cap and absolutely requires one. This isn’t optional kit: Nissan’s own N15 Owner’s Manual details opening, tightening and replacing the fuel cap, and cautions about evaporative emissions and the Check Engine light if it’s not sealed properly (Nissan Pulsar N15 Owner’s Manual, 1999). The N15 Workshop/Service Manual also ties the cap directly to the EVAP system and starts fault-finding for DTCs like P0440/P0442/P0455 with cap inspection (N15 EC/EVAP diagnostics). Local compliance rules of the era (e.g., ADR 37/00 for evaporative control, mirrored in NZ compliance practice) require a sealed system, which the cap helps deliver.

On the ’99 Pulsar, the fuel cap’s job is simple but critical. It seals the tank to stop petrol vapour escaping, keeps water and grit out, and lets the EVAP system do its thing so the car stays efficient and the cabin doesn’t pick up a fuel odour. A proper seal also reduces the risk of spillage and helps prevent a nuisance Check Engine light after refuelling. The cap uses a ratcheting mechanism and a rubber gasket to maintain the seal, when tightened until it clicks, it’s doing its best work.

As part of routine servicing, it’s smart to give the cap a quick once-over:

• Look for a cracked, flattened or swollen rubber seal.
• Check the ratchet: if it doesn’t “click” or feels gritty, it may be worn.
• Inspect the tether and the filler neck lip for nicks or corrosion.
• Notice any fuel smell around the rear quarter after parking? The cap’s seal could be the culprit.

Maintenance is easy. Wipe the cap and the filler neck with a clean, damp cloth at service time. Avoid petroleum-based cleaners on the rubber seal. If the seal is perished or the cap won’t click, replace it. Choose an OEM or ADR-compliant aftermarket cap that’s specified for the N15 Pulsar, the EVAP system expects a non-vented, emissions-rated cap. After installation, tighten until it clicks and drive a few trips to let the ECU run its EVAP checks—this often clears a post-refuel warning light if the old cap was the issue.

There’s no hard replacement interval, but in Aussie and Kiwi conditions, many owners find a cap lasts years, still, an annual inspection with other service items is a good shout. If in doubt, a fresh cap is inexpensive insurance for emissions, economy and that pesky CEL.

Popular questions

What type of fuel cap does a 1999 Nissan Pulsar use?
The N15 Pulsar uses a non-vented, emissions-rated cap designed for sealed EVAP systems. An OEM cap or a quality aftermarket cap that specifically lists compatibility with the 1995–2000 Pulsar/N15 is the safe pick. It should ratchet when tightened and include a robust rubber sealing ring.

Why did the Check Engine light come on after refuelling?
A loose, damaged or incorrect fuel cap is a common trigger for EVAP faults like P0440/P0442/P0455 on the Pulsar. First, remove and re-fit the cap until it clicks, then drive a few normal trips. If the light persists, the cap’s seal may be shot or there’s another EVAP leak that needs diagnosis.

How often should the fuel cap be replaced?
There’s no fixed schedule. Inspect it at each service: if the gasket is cracked, the cap won’t click, or there’s a persistent fuel odour, replace it. Many last 5–10 years, but heat and UV can shorten that, so be pragmatic—if it looks tired, swap it.