Integrated fuel pump and control preservation system
A portable fuel preservation system is disclosed. The portable fuel preservation system may comprise a switch box configured to be coupled to an integrated fuel pump and control of a gas turbine engine. The switch box may comprise a circuit configured to cause a metering valve and a solenoid valve of the integrated fuel pump and control to open. A driver may be configured to inject preservation fluid into the integrated fuel pump and control.
1. A switch box for opening and closing a metering valve, a first solenoid valve, and a second solenoid valve of an integrated fuel pump and control during preservation of a fuel system, comprising:
a mating connector configured to engage a pin interface of the integrated fuel pump and control, the mating connector comprising a first pin and a second pin; and
a circuit electrically coupled to the mating connector, the circuit comprising:
a power supply electrically coupled to the first pin of the mating connector and electrically isolated from the second pin of the mating connector, wherein the first pin of the mating connector is configured to engage a third pin of the pin interface, the third pin being electrically connected to the metering valve of the integrated fuel pump and control, and wherein the second pin is configured to engage a fourth pin of the pin interface, the fourth pin being electrically coupled to the first solenoid valve; and
a resistor coupled between the power supply and the first pin, wherein the circuit is configured to generate a current that opens the metering valve, the first solenoid valve, and the second solenoid valve of the integrated fuel pump and control at the same time.
2. The switch box of claim 1 , wherein the resistor comprises a one kilo-ohm resistor.
3. The switch box of claim 2 , wherein the power supply comprises a 28 volt power supply.
4. The switch box of claim 1 , further comprising a mechanical switch configured to open and close the circuit.
5. The switch box of claim 4 , further comprising an indicator light configured to illuminate when the circuit is at least one of open or closed.
6. The switch box of claim 1 , wherein the power supply and the resistor generate between a 10 milliamp and 50 milliamp current.
7. The switch box of claim 1 , wherein the resistor comprises a potentiometer.
8. A portable fuel preservation system, comprising:
a switch box for opening and closing a metering valve, a first solenoid valve, and a second solenoid valve of an integrated fuel pump and control of a gas turbine engine, the switch box including:
a mating connector configured to engage a pin interface of the integrated fuel pump and control, the mating connector comprising a first pin and a second pin; and
a circuit electrically coupled to the mating connector, the circuit comprising a power supply electrically coupled to the first pin of the mating connector and electrically isolated from the second pin of the mating connector, wherein the first pin of the mating connector is configured to engage a third pin of the pin interface, and the third pin being electrically connected to the metering valve of the integrated fuel pump, and wherein the second pin is configured to engage a fourth pin of the pin interface, the fourth pin being electrically coupled to the first solenoid valve, and wherein the circuit is configured to generate a current that opens the metering valve of the integrated fuel pump and control, the first solenoid valve of the integrated fuel pump and control, and the second solenoid valve of the integrated fuel pump and control at the same time; and
a driver configured to inject preservation fluid into the integrated fuel pump and control;
wherein the integrated fuel pump and control is configured to receive commands from an electronic engine controller, and wherein the electronic engine controller and the switch box can be coupled to the integrated fuel pump and control at the same time.
9. The portable fuel preservation system of claim 8 , wherein the circuit further comprises a resistor coupled between the power supply and the first pin.
10. The portable fuel preservation system of claim 9 , wherein the current is between 10 milliamp and 50 milliamp.
11. The portable fuel preservation system of claim 9 , wherein the resistor comprises a one kilo-ohm resistor.
12. The portable fuel preservation system of claim 8 , wherein the circuit supplies a voltage configured to actuate the metering valve.
13. The portable fuel preservation system of claim 8 , wherein the switch box further comprises an indicator light configured to illuminate when the circuit is at least one of open or closed.