How to Pressure Test a Gas Tank


Fuel problems can be difficult to diagnose without paying the host costs of a repair shop. Pressure testing is an excellent, inexpensive way to troubleshoot problems with gas tanks and fuel pump systems. By pressure testing, you can rule out certain conditions, such as a leak in the tank or a plugged outlet. This quick method demonstrates pressure testing while the tank is still inside the car, reducing labor costs.

Things You'll Need

  • 1 pressure tester set with rubber grommets
  • 3 needle nose vise grips
  • Locate the supply and return lines running out of the tank reservoir. Clamp the supply line tightly with a pair of needle nose vise grips. Clamp return line tightly with a pair needle nose vice grips.

  • Find the overflow house next to the fill spout and clamp with the remaining pair of needle nose vise grips.

  • Place a rubber grommet of correct size into fill spout, pushing hard to ensure a complete seal. Pump pressure tester up to 10 pounds per square inch (psi). Do not exceed 12 psi. Let it stand for five minutes.

  • Check the pressure tester gauge for the psi readout. If the pressure has dropped from the original reading, there is a leak. If pressure has held, the tank is leak-free.

Tips & Warnings

  • Do not exceed 12 psi when pressure testing the gas tank.

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  • Photo Credit pressure guage image by Jeff Davies from
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