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Date:  8-5-2023
Number of Hours:  3.00
Manual Reference:  
Brief Description:  AUX Fuel Pump.

Over night I have been thinking about why the AUX fuel pump was not working.
Today I checked all the wiring to the AUX fuel pump.
Positive and negative were correct, earth wiring was OK, I had power to the pump ( 12.5 Volts ), the AUX pump switch worked OK, nothing was reversed.
The multimeter got a very good workout to no avail, every thing seemed to be as it should.
I decided to do an airline engineering procedure which I have seen many times over the years, it is referred to as a " TT " ( Technical Tap ).
I applied power to the pump from an external battery and lightly tapped the pump with a small hammer.
To my relief and surprise the pump leapt into action and has not faulted since.
The pump had sat idle for a number of years and just needed some encouragement to work.
Total hours .3 of an hour, therefore, 18 minutes running yeaterday.
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AUX pump on.

AUX pump on.

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Fuel pressure 3.6 PSI

Fuel pressure 3.6 PSI

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The Technical Tapper.

The Technical Tapper.

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