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Fuel
Systems
Manufacturer Requirements
FEDERAL LAW
183.556 - Plugs and fittings
(b) A plug used to service the fuel filter
or strainer must have a tapered pipethread or be a screw
type fitted with a locking device other than a split
lock washer.
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Fuel filters and strainers may have a servicing
plug or screw fitting; however, they must be either:
(a) a tapered pipe-thread type of plug, or
(b) a screw-type of plug incorporating or
provided with a locking means other than a split lock washer.
Gaskets and seals must be an unsplit ring and meet the leakage
prohibition required by 183.536(b).
The locking device should provide for repetitive
removal and replacement without leakage. Some types of a locking
device, such as a star lock washer, can damage surfaces upon
repetitive disassembly and assembly, potentially affecting
the ability of the filter or strainer to remain leakproof.
TO COMPLY WITH THE LAW
The servicing plug for a filter or strainer
is either:
- a tapered pipe-thread, or
- a screw-type with a locking device
other than a split lock washer.
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