Fuel Systems

Appendix A — Fuel System Standard

14.0 — Lab Examination No. 10
Fuel Tank Static Pressure Test

183.580 - Static pressure test for fuel tanks

A fuel tank is tested by performing the following procedures in the following order:

(a) Fill the tank with air or inert gas to the pressure marked on the tank label under section 183.514(b)(5). The pressure is measured by a calibrated pressure gauge with a pressure range not exceeding three times the test pressure required by this paragraph or by a manometer.

(b) Examine each tank fitting and seam for leaks using a leak detection method other than the pressure drop method. The requirements of this Lab Examination are prescribed in sections 183.510(a), 183.584(a) and (f), 183.586(a) and (g), and 183.588(a) and (g) of the Fuel Systems Standard.

14.1 Apparatus — Regulated pressure source of either air or nitrogen, manometer and leak detection solution.

14.2 Test Specimens — The fuel tank(s) as received in the boat with all attachments and fittings installed by the tank manufacturer on the tank(s).

14.3 Test Conditions — All openings and fittings in the tank(s) shall be plugged and sealed prior to pressurization.

14.4 Test Procedure

14.4.1 Obtain the test pressure used for the pressure check of the tank from the tank nameplate or the tank manufacturer.

14.4.2 The tank shall be attached to a regulated-pressure source of either air or nitrogen and subjected to the test pressure. The pressure is to be measured by a manometer; a pressure gauge with a maximum range of no more than three times the test pressure may be used, but a pop-off relief valve should be used in conjunction with the pressure gauge to protect against over pressurization, which could be hazardous.

14.4.3 All seams, fittings, and joints shall be tested for leakage and the fuel tank checked for signs of permanent deformation.

14.4.4 Determination of leakage shall be made utilizing acceptable leak detection methods, which include the use of soapy water or liquid detergent solution applied to all seams, fittings, and joints.

14.4.5 There shall be no leakage. Another method of leak detection is to completely submerge the pressurized tank in water and visually inspect it for gas bubbles over 100% of the outer surfaces. The test pressure must be at least 3-psig greater than the hydrostatic pressure of the water at the lowest part of the fuel tank being tested.

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