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 (5)  Remove the HP fuel filter (AMM 73-11-12/401).
 S 207-073
 (6)  Do a check of the engine fuel filters and bowl for signs of
 contamination of the fuel.
 (a) Do these steps:
 1) Replace the LP fuel filter if you think that there is
 contamination (AMM 73-11-10/401).
 2) If there is no contamination, install the same LP filter
 (AMM 73-11-10/401).
 3) Replace the HP fuel filter if you think that there is
 contamination (AMM 73-11-12/401).
 4) If there is no contamination, install the same HP filter
 (AMM 73-11-12/401)
 S 657-074
 (7)  Refuel the fuel tanks with new clean fuel (AMM 12-11-01/301).
 NOTE: For most airplane fuel tanks, this will give a dilution____
 ratio of new fuel to trapped fuel fuel in the range of 1000:1
 to 10,000:1.

 S 707-075
 (8)  
Take a fuel sample from the tank sumps (AMM 12-11-03/301).

 S 657-076

 (9)  
If you see signs of continued contamination, repeat the defueling and refueling steps above.

 (a)  
If the contamination continues, remove all fuel from the tank, including trapped fuel.

 S 837-077
 (10)
 If the samples from the fuel tank sumps do not show signs of contamination, do the subsequent steps:

 (a)  
Start the APU (AMM 49-11-00/201)

 (b)  
Start the engines (AMM 71-00-00/201).

 (c)  
Let them operate approximately 5-8 minutes or until the dirty fuel is flushed from the fuel system.

 (d)  
Make sure that the engine and its controls operate correctly in all standard power settings.

 (e)  
Speak to the engine and APU manufacturers about more inspections or tests.

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757
MAINTENANCE MANUAL

 S 097-086
 (11)
 After you operate the engine and the APU, do these tasks:

 (a)
Remove the LP fuel filter (AMM 73-11-10/401).

 (b)
Remove the HP fuel filter (AMM 73-11-12/401).

 S 207-087
 (12)
 Do a check of the engine fuel filter and the fuel filter bowl for signs of contamination of the fuel.

 S 207-079

 (13)
 If you see no signs of contamination, do these steps:

　
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