| 摘要 |
A vacuum assist vapor recovery system, e.g., in or for a fuel dispensing system (10), having a coaxial hose (16) with an outer fuel conduit (28) for delivery of fuel and an inner vapor conduit (30) for recovery of vapor, includes an indicator assembly (20) for providing indication of vapor flow reduction in the inner vapor conduit, e.g., due to restriction of flow cross-section in the inner vapor conduit or failure of a vacuum pump or other vacuum control device. The indicator assembly includes a detector element (38) in communication with the inner vapor conduit for detection of vapor flow within the inner vapor conduit and an indicator element (40) of vapor flow for indication of vapor flow within the inner vapor conduit detected by the detector element.
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