4.7 REPLACE COALESCER ELEMENTS AND SEPARATOR ELEMENT.
This procedure is performed when the reading observed on the differential pressure gauge during operation reaches or
exceeds fifteen psi, or when the liquid fuel filter-separator is to be used with a different type of pumpage. (Coalescer
elements should be dedicated to one type of pumpage [e.g., JP-4 only]). Used elements should be handled with rubber
gloves due to the toxic effects of some fuel additives. New elements should be handled with clean rubber gloves or the
packing bag to avoid hand contact with the element surface. Soiled hands - even normal skin oils - may contaminate the
filter element and render it ineffective.
This task consists of:
Tool Kit, General Mechanics
O-Ring (Appendix I, Item 1)
(Appendix B, Section III, Item 1)
Washer, Lock (Appendix I, Item 18)
Chemical and Oil protective gloves
Washer, Lock (Appendix I, Item 19)
(Appendix B, Section III, Item 2)
Cloth, lint free (Appendix F, Section II, Item 1)
General Safety Requirements:
Liquid fuel filter-separator removed from
AAFARS. TM 10-4930-250-13&P, para. 2.8.
Fuels are toxic and flammable. Do not get on person
Filter vessel cover removed. (para. 4.6)
or clothing. Do not use near open flame. Area
should be well ventilated.
Fuel is flammable. Do not smoke.
Death or personal injury may result from the explosion of fuel fumes exposed
to an open flame or spark, or to static discharge. Do not permit smoking, any
open flame, or spark producing equipment within fifty (50) feet of the liquid fuel
filter-separator. Ensure all equipments are well grounded prior to commencing
any operation or maintenance task.
Rubber gloves should be worn when handling refueling system components
due to the toxic effects of some fuel additives.
This procedure assumes that the liquid fuel filter-separator has been defueled.
However, some fuel will have accumulated in the sump due to normal drainage of
saturated coalescer elements after defueling.
a. Removal. (Figure 4-3)
Remove nuts (1), lock washers (2) and element retainer (3).