Section 4: Diesel Fuel Systems; General Information; Diesel Fuel Base Tank; Diesel Fuel Recommendations - Generac Power Systems D2.5L G2 Installation Manuallines

Section 4: Diesel Fuel Systems

General Information

Since diesel fuels are less volatile than gasoline or
gaseous fuels, they are sometimes considered safer.
Due to this perception, careless installation practices can
occur which may lead to serious problems with generator
set performance and reliability.
Periodically inspect and test the system to verify all
components remain in good working order.
A B C
K H
A Emergency Vent—on main tank and rupture basin.
B Fuel Fill
C Vent
D Fuel Return Line—from engine;
sometimes supplied with a check valve
E Fuel Supply Line—to engine fuel pump;
includes in-line check valve
F Stub Up Area
G Rupture Basin Leak Detector
H Baffle
J Leak Containment Area
K Fuel Level Sensor—electrical, mechanical, or both
NOTE: Some fill lines are equipped with overflow
containment.
Some applications require extending the vent line outside
of an enclosure or to outside air along with adequate spill
containment.
Installation Guidelines for Protector Diesel Generators
A D
J
Figure 4-1. Typical Integrated Diesel Fuel Base Tank

Diesel Fuel Base Tank

See Figure 4-1. Units provided are typically mounted on
their own base/fuel tank. These are plumbed at the
factory. Tank construction is typically double-wall. The
base tank is the main fuel tank and incorporates the
following items:
E
H

Diesel Fuel Recommendations

IMPORTANT! DO NOT use home heating oil or bio-
diesel fuel.
Use No. 2D diesel fuel when temperatures are above
freezing. When temperatures are below freezing, blend
No.1D diesel fuel and No. 2D diesel fuel together for a
climate adjusted fuel ratio.
Diesel fuel must also meet the following requirements:
• Sulfur content of 15 parts per million (ppm)
maximum.
• Minimum Cetane index of 40.
NOTE: Low ambient temperatures as well as engine
operation at high altitudes may require the use of fuels
with higher Cetane ratings.
Allow at least 5 percent of the tank capacity for fuel
expansion. DO NOT OVERFILL!

Fuel Maintenance

Diesel fuel must be treated for long term storage. Use
approved fuel additive and water abatement material. Test
stored fuel every 90 days and add treatment as required.
Periodically check and dry abatement as needed.
Diesel Fuel Systems
G F
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