Illustrated fuel cap diagram showing cutaway cross-section and r…
'87-96 Fuel Cap w/tether Ford F4TZ-9030-C (MotorCraft FC920) or Motorad MGC817T. Also w/o tether Motorad MGC817, Gates 31615 ACDelco 12F46 Stant 10819.
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The fuel fill cap is used to prevent fuel spill and close the evaporative/fuel system to atmosphere. It also serves as the source at which the evaporative emission service kit can be attached to check evaporative emission system leakage. Fill cap damage or contamination that renders the pressure-vacuum valve inoperative may result in deformation of the tank. Care should always be exercised to make sure the fill cap is in working order. The fuel fill cap is sealed and includes a built-in pressure-vacuum relief valve. Fuel system vacuum relief is provided after 3.5 kPa (0.50 psi) and pressure relief after 11.0 kPa (1.6 psi). Under normal operating conditions, the fill cap operates as a check valve, allowing air to enter the tank as fuel is used, while preventing vapors from escaping the tank through the cap.
The locking version is Ford F67Z9030DA or Motorad MGC900 and MC FC935 but it requires an additional pushpin for the tether. Also single Stant 10501 or Gates 31734 or [urll=https://www.amazon.com/dp/B000C5CEKC]Motorad MGC791[/url] or pair MotoRad MGC791SK.
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