Service Manual

6. While pressure is being applied, watch for an accu-

mulation of fuel at the tip of the nozzle (Fig. 18). A small

amount of fuel may be present due to a previous chat-

tering test - this would be normal. If the fuel accumulates

and drips down during the test (about ten seconds) the

nozzle assembly is defective and must be replaced.

Spray Test

For proper combustion, the nozzle must effectively at-

omize

the injected fuel.

1. Operate the pump handle at a rate of 20 - 30 strokes

per minute.

2. Observe the injector nozzle spray. The spray pattern

should be finely atomized in a broad, straight stream

(Fig. 19).

3. If the nozzle fails to spray properly, it must be cleaned,

paired or replaced. (See Nozzle Service in the Fuel

System Repairs section of this chapter.)

Figure 18

Figure 19

Groundsmaster

300 Series Page 4 - 21 Testing