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16.
Vent fitting See Figure 8.107.
Figure 8.107
•
The vent fitting regulates the amount of vapor
that escapes. It also allows air to enter the fuel
tank to take up room in the tank as the fuel is
used.
•
The fitting consists of a plastic chamber that
contains a regulating orifice.
•
For installation: install the bushing first, lubricate
the fitting with diesel fuel, and install it in the
bushing.
17.
When diagnosing a fuel starvation or flooding
issue confirm that the vent is not blocked.
See Figure 8.108.
No pressure
Vent good
No vacuum
Figure 8.108
Chapter 8 - Caterpillar Engine and Related Systems
18.
Fuel level sender: See Figure 8.109.
•
As the fuel level goes down the float lowers
causing the switch to make contact and illumi-
nating the low fuel warning light.
•
For installation: install the bushing first, lubricate
the fitting with diesel fuel, and install it in the
bushing.
19.
Sender diagnostics: See Figure 8.109.
•
Lower the float to the lowest position to close the
contacts in the sender.
•
Raise the float approximately 3" to open the con-
tacts in the sender.
Float up:
contacts open
259
Figure 8.109
Float down:
contacts closed
Figure 8.110
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Troubleshooting
