FUEL PRO
®
485
TECHNICAL MANUAL
®
F1485 REV B
T e c h n o l o g y , L L C
12
DAVCO Technology, LLC
www.davco.com
800-328-2611
1600 Woodland Drive, Saline, MI 48176-1629
SERVICE PROCEDURE - BYPASS VALVE
Bypass valve Installation
1 . Remove the vent cap . Open the drain valve by turning one
to one and a half revolutions . Drain the Fuel Pro com-
pletely . Close the drain valve .
2 . Remove the collar (using a DAVCO wrench) then remove
the clear cover .
3 . Remove the filter .
4 . Using a clean shop rag, clean the cover, the collar and the
threads on the Fuel Pro body .
5 . Flush the inside of the Fuel Pro body with clean diesel
fuel to clear it of any debris .
6 . Remove the bypass valve assembly and discard .
7 . Remove the protective cap from the replacement bypass
valve assembly .
8 . Install the replacement bypass valve assembly into the
Fuel Pro body (torque to 20 ft-lbs) .
9 . Install the filter . Refer to the section “Filter Change” to
ensure that the filter is aligned correctly .
10 . Apply downward pressure on the top of the cover and
rotate the collar until contact .
11 . Use a DAVCO wrench (if necessary) to tighten 3 addi-
tional ribs .
12 . Prime the unit by filling the clear cover with diesel fuel
until it reaches the top of the filter .
13 . Install the vent cap . Hand tighten until it clicks .
14 . Start the engine and run for one minute . Slowly open the
vent cap and allow the fuel level to drop to about one inch
above the collar .
15 . Hand tighten the vent cap until it clicks .
Bypass Valve
