Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Fuel Tank Pressure Sensor
The Fuel Tank Pressure (FTP) sensor is a pressure transducer. The Powertrain Control Module (PCM) supplies about 5 volts on the FTP reference circuit. The PCM also supplies a signal and ground circuit to the FTP. When the fuel tanks are full, high pressure, a high voltage signal will be monitored by the PCM. The FTP sensor is threaded into the fuel tank HPL solenoid. The volume of CNG will vary with temperature and pressure. Accurate CNG fuel level cannot be determined by pressure only. To compensate for the different volume factors a Fuel Tank Temperature (FTT) sensor is mounted within the HPL. The PCM performs a calculation on the fuel tank pressure vs. the in-tank temperature. The PCM will then display the temperature corrected CNG fuel level. The CNG FTP sensor should not be confused with the gasoline FTP sensor that is utilized for Evaporate (EVAP) emissions monitoring.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.