TM 55-1930-209-14&P-19 Table 17-4.  Preventive Maintenance Checks and Services for Workboat, Lifesaving, and Firefighting Systems (Continued) Before D -  During A -  After D -  Daily H -  Hourly Interval INTERVAL ITEM PROCEDURES EQUIPMENT ITEM TO BE CHECK FOR AND HAVE IS NOT READY/ NO. INSPECTED REPAIRED OR ADJUSTED AVAILABLE IF B   D   A   D H AS NECESSARY 3c • • • Engine a.      Check fuel tank for leaks and cracks. Class III leaks. Fuel System WARNING During fueling operations, neither open flame nor smoking is permitted within 25 feet of fueling operations.  Only minimum number of persons necessary to conduct fueling are permitted in area.  Make sure all electrical accessories are off before a refu- eling operation begins. • • 200 hrs b. Check fuel gauge on instrument panel.  It necessary to refuel, follow these proce- dures: WARNINGS ELECTRICAL HIGH VOLTAGE CAN KILL YOU •Electrical high voltage cannot be seen but it can kill you.  Electricity is unlike most other dangerous things you can come in contact with because it gives no warning and no symptoms to be wary of.  Its effect is imme- diate.  It can kill you, render you uncon- scious, or severely burn you.  To ensure your safety and that of other maintenance per- sonnel, always observe the following pre- cautions: ALWAYS make sure the unit is properly grounded. 1) Secure engine compartment hatch. 2) Attach ground wire from barge to Workboat not workboat, assuring good contact properly grounded. from clamp to metal part of workboat. 3) Use Perko special key or large screw- driver to open fuel filler cap on port- side aft of cabin. 4) Monitor fuel gauge on instrument panel at operator's station while filling tank.  Do NOT fill fuel tank full.  Leave room for expansion of cool fuel com- ing from voids storage tank into warmer workboat fuel tank. 5) Close fuel filler cap. 6) Remove ground wires and reattach to fueling stations. 7) Clean fuel spills immediately. 17-11