FUEL PRO
®
483
TECHNICAL MANUAL
T e c h n o l o g y , L L C
7
DAVCO Technology, LLC P. O. Box 487 Saline, MI 48176 800-328-2611 www.davco.com F1305 REV F
Note:
Steps 1 thru 4 can be skipped if the Fuel Pro 483
coolant heat ports are easily accessible .
1 . Remove the vent cap and drain the Fuel Pro complete-
ly .
2 . Disconnect the fuel inlet and outlet hoses .
3 . Disconnect all electrical components (if equipped) .
4 . Remove the Fuel Pro from the truck and mount in a vise
so the Coolant Heater Integral Manifold area is acces-
sible .
5 . Remove the Thermovalve plug using a 1¼" socket or
wrench and discard .
Note:
To identify if your Fuel Pro 483 has a thermovalve
installed, the thermovalve plug will be gold in color .
6 . Install the Thermovalve assembly with the brass sens-
ing probe first . Be careful to guide the Thermovalve into
the port straight without damaging the o-rings .
7 . Torque to 30-55 ft-lbs .
8 . Remove a ½" NPT steel plug from each side/bottom of
the Coolant Heater Integral Manifold .
�
CAUTION: A coolant shutoff valve is required
for summer operation for most engines,
until the DAVCO Thermovalve is available.
A shutoff valve can be installed in either of
the coolant ports in the Fuel Pro 483 or the
coolant hoses going to these ports.
9 . The ports are available on the bottom and side of the
Coolant Heater Integral Manifold for ideal fitting clear-
ance per application . Only one port per side can be
used to ensure ample coolant flow across the body .
Coolant flow is not direction sensitive .
Note:
Do not connect as shown below .
10 . Select suitable ½" NPT to 5/8" barb fittings – straights,
45°s or 90°s can be used, based upon application
requirements .
11 . Apply liquid thread sealant to the threads of the fittings .
Note:
Do not apply sealant to the first two threads of the fit-
ting . This is to prevent excess sealant from getting into the
coolant cavity of the Fuel Pro .
12 . Install the fittings and torque to 15-30 ft-lbs . Position
the fittings as needed .
13 . Install the Fuel Pro 483 and torque the mounting hard-
ware to OEM specifications .
14 . Connect the electrical components .
15 . Connect the fuel inlet and outlet hoses .
16 . Connect a hose from the high pressure side of the
engine coolant system to the Fuel Pro Coolant Heater
Integral Manifold .
�
Coolant lines must be parallel, not in series.
17 . Connect a hose from the Coolant Heater Integral Mani-
fold to a low pressure side in the coolant system .
Note:
“Y” or “T” connectors can be used in the cab heater
hoses if no engine ports are available .
18 . Prime the unit by filling the clear cover with clean diesel
fuel until it reaches the top of the filter .
19 . Install the vent cap . Tighten it by hand until it clicks .
20 . Start the engine and run for one minute .
Slowly
open
the vent cap and allow the fuel to drop to about one
inch above the collar .
21 . Close the vent cap . Tighten it by hand until it clicks .
Note:
It is normal for the fuel level to vary after the initial
start-up and during engine operation . Filter performance is
not affected .
UPGRADING FUEL PRO 483 TO COOLANT HEAT*
Summary of Contents for FUEL PRO 483
Page 21: ......