55. Q. If steam or water shows at the overflow pipe when the injector is
not working, how can you tell whether it comes from the boiler check or
the injector throttle?

A. Close the main steam valve at the boiler, that will stop the leak if
it comes from the injector throttle.

56. Q. Will an injector prime if primer valve leaks? Will that prevent
its working?

A. It will prime, but not as readily as with priming valve in good
condition. This will not prevent its working, but it may waste some
water from the overflow.

57. Q. Will an injector work if air cannot get into the tank as fast as
the water is taken out?

A. No.

58. Q. If you had to take down a tank hose, how would you stop the water
from flowing out of the tank that has the syphon connections instead of
the old-style tank valves?

A. Open the pet cock at the top of the syphon before taking the hose
down.

59. Q. Is any more water used when the engine foams than when the water
is solid?