# SDR CA040210006

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 6, 2004
- Submitted: April 1, 2004
- Operation: General aviation
- Make and model: Saab SF340A
- Registry model: [Saab SF340A](https://openairdocs.org/model/saab-scania-sf340a) (OpenAirDocs)
- Engine: Ge CT75A2
- Propeller: Rotol R3894123F25
- System (JASC): [7334 · Fuel Pressure Sensor](https://openairdocs.org/jasc/7334)
- Part: Pressure Switch
- Part number: 8346
- Condition: Leaking
- Location: Fuel System
- Stage of operation: CR
- How discovered: O
- Nature of condition: K, J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CA040210006

## Discrepancy

(CAN) DUE TO INTERNAL LEAKAGE OF DIFFERENTIAL PRESSURE SWITCH, A LOST OF FUEL WAS HAPPENING THRU THE OVERBOARD DRAIN WHICH WAS CREATING A PRESSURE DROP IN FUEL PUMP SYSTEM, THE AUX PUMP WOULD THEN COME ON AND OFF THUS CREATING A SMALL FLUCTUATIONIN THE ENGINE PARAMETERS. AFTER INVESTIGATION AN IMPROVE SWITCH WAS MADE AVAILABLE THRU SB73-011 DUE TO IMPROVED RELIABILITY. THE OLD PN 8346 CAN BE NOW IMPROVE BY USING PN 8346-001.

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