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Buick Skylark Fuel Tank Pressure Sensors

Buick Skylark Fuel tank pressure sensors

Starting at low prices, AutoBuffy stocks multiple fuel tank pressure sensors from top OE-quality brands. This sensor monitors vapor pressure inside the fuel tank as part of the EVAP system, helping the ECU detect fuel vapors and leaks. When it fails, your Buick Skylark will typically trigger a check engine light and fail an emissions test.

Signs your Buick Skylark needs a new fuel tank pressure sensor

  • Check engine light on with EVAP-related codes such as P0450, P0451, P0452, or P0453
  • Failed emissions or OBD-II inspection due to an incomplete or failing EVAP monitor
  • Fuel odor near the rear of the vehicle from undetected vapor leaks
  • Difficulty starting after the vehicle has sat for several hours, caused by fuel pressure loss
  • Poor fuel economy with no other obvious cause, as the ECU may run an overly rich fuel correction
  • EVAP system readiness monitor will not complete, preventing a passing smog check

Which fuel tank pressure sensor should you buy for your Buick Skylark?

The most important buying decision is fitment: fuel tank pressure sensors are highly vehicle-specific by connector type, pressure range, and mounting thread or clip style. Beyond fitment, the choice comes down to OE-equivalent quality versus budget aftermarket, as sensor calibration accuracy directly affects EVAP system diagnostics.

OEM-equivalent (name-brand aftermarket)
Best for
Most drivers who want a reliable, long-term fix
What you get
Matched pressure range and connector, meets or exceeds original factory calibration specs
Budget aftermarket
Best for
Short-term fix or high-mileage vehicles where cost is the priority
What you get
Lower upfront cost, but may have wider calibration tolerances that can cause intermittent codes
Remanufactured / dealer OEM
Best for
Owners who want exact factory specs with no guesswork
What you get
Identical calibration and fit to the original sensor, typically carries a warranty
Combined fuel tank pressure and rollover valve assembly
Best for
Vehicles where the sensor is integrated into a multi-function unit
What you get
Replaces the entire assembly at once, eliminating the risk of related component failure

Replacing the fuel tank pressure sensor on a Buick Skylark

Moderate⏱ 1–2 hoursOBD-II scan tool (to read and clear codes)Basic socket and ratchet setFlathead and Phillips screwdriversFuel line disconnect tool setSafety glasses and nitrile gloves

On most vehicles, the fuel tank pressure sensor is located on top of the fuel pump module or on the EVAP canister, and accessing it may require lowering the fuel tank partially or removing a trunk or bed floor panel. Disconnect the battery negative terminal and relieve any residual fuel system pressure before unplugging the sensor connector and unthreading or unclipping the sensor. Install the new sensor, reconnect the harness, clear stored EVAP codes with a scan tool, and run the vehicle to confirm the EVAP monitor completes without returning a fault.

Frequently asked questions

How much does it cost to replace fuel tank pressure sensors on a Buick Skylark?
Parts start at low prices at AutoBuffy. A shop will typically charge one to two hours of labor on top of the part cost, since sensor access often requires dropping or partially lowering the fuel tank on many vehicles. DIYing the replacement keeps your total cost to just the part.
Can I drive my Buick Skylark with a bad fuel tank pressure sensor?
You can drive short distances, but it is not recommended. A failed sensor leaves the EVAP system unable to detect real fuel vapor leaks, which are both an emissions violation and a fire hazard. The check engine light will also prevent passing an inspection until the fault is resolved.
Will replacing the fuel tank pressure sensor clear the check engine light on my Buick Skylark?
Yes, in most cases. If the sensor itself is the root cause of the EVAP code, replacing it and clearing the fault with a scan tool will extinguish the light. If the light returns, a secondary issue such as a leak in the EVAP purge valve, canister, or hoses is likely present.
How do I know if my Buick Skylark has one or two fuel tank pressure sensors?
Most vehicles use a single fuel tank pressure sensor mounted on or near the fuel pump module or the EVAP canister. Some larger trucks and SUVs with dual tanks use one per tank. Check your vehicle's EVAP system diagram or cross-reference your VIN in our fitment tool to confirm.
Is the fuel tank pressure sensor the same as the fuel rail pressure sensor on a Buick Skylark?
No, these are two different parts. The fuel tank pressure sensor measures vapor pressure inside the tank for the EVAP emissions system. The fuel rail pressure sensor measures liquid fuel pressure delivered to the injectors. They have different pressure ranges, connectors, and diagnostic trouble codes.
How long does a fuel tank pressure sensor typically last on a Buick Skylark?
Most fuel tank pressure sensors last well into the vehicle's mid-life, often many years under normal conditions. Early failure is usually caused by exposure to fuel vapors, corrosion at the connector, or physical damage from debris. Vehicles in high-humidity or road-salt climates may see shorter sensor life.

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Fuel tank pressure sensors for other Buick models

Buick Regal SportbackBuick Park AvenueBuick RegalBuick RainierBuick RendezvousBuick Lucerne