Page 12
Both conditions require that you use a two-pipe system,
which consists of a return line that purges the fuel pump of
air by returning it to the tank. To determine the run and lift for
piping, refer to table 4.
Figure 14
Oil Piping
ÎÎÎÎÎÎÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎÎÎÎÎÎÎ
Fuel
Pump
Aux
Filter
Return
pipe
Fill
Pipe
Air Vent
Oil
Tank
Inlet
Return
Pipe
H
3”-4”
(76 mm -102 mm)
R
Outside tank fuel pump above bottom of tank
Two‐Pipe System
Use continuous lengths of heavy wall copper tubing or
steel pipe for oil supply pipe. Install oil supply pipe under
floor or near walls to protect it from damage. Avoid running
pipes along joists or reverberating surfaces. Always use
flare fittings. All fittings must be accessible. Do not use
compression fittings.
IMPORTANT
Both oil supply and return pipes must be submerged
in oil in the supply tank.
Table 4
Two-Pipe Maximum Pipe Length (H + R)
Lift “H”
3450 RPM - 3 GPH (11.4 LPH)
3/8” (10 mm) OD
Tubing
1/2” (12 mm) OD
Tubing
Single
Stage
Two
Stage
Single
Stage
Two
Stage
0'
(0.0 m)
84'
(25.6 m)
93'
(28.3 m)
100'
(30.5 m)
100'
(30.5 m)
2'
(0.6 m)
73'
(22.3 m)
85'
(25.9 m)
100'
(30.5 m)
100'
(30.5 m)
4'
(1.2m)
63'
(19.2 m)
77'
(23.5 m)
100'
(30.5 m)
100'
(30.5 m)
6'
(1.8m)
52'
(15.8 m)
69'
(21.0 m)
100'
(30.5 m)
100'
(30.5 m)
8'
(2.4m)
42'
(12.8 m)
60'
(18.3 m)
100'
(30.5 m)
100'
(30.5 m)
10'
(3.0m)
31'
(9.4 m)
52'
(15.9 m)
100'
(30.5 m)
100'
(30.5 m)
12'
(3.7m)
21'
(6.4 m)
44'
(13.4 m)
83'
(25.3 m)
100'
(30.5 m)
14'
(4.3m)
---
36'
(11.0 m)
41'
(12.5 m)
100'
(30.5 m)
16'
(4.9m)
---
27'
(8.2 m)
---
100'
(30.5 m)
18'
(5.5m)
--- --- ---
76'
(23.2 m)
Table 5
Fuel Pump Usage
Pump Piping Application Maximum Lift (vacuum)
Single-Stage Pump
One-Pipe System 8 ft. (6” Hg vacuum)
Two-Pipe System 10 ft. (12” Hg vacuum)
Two-Stage Pump Two-Pipe System
10 ft. or greater
(12” to 17” Hg vacuum)
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