DW 9-403-1047 User manual

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15-17 Mustang DW400 Fuel Pump Installation Guide
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9-403-1047
15-17 Mustang DW400 Fuel Pump
Installation Guide
Parts List:
DW400
1/8” Fuel Hose
3/8” Fuel Tubing
11/32” Hose Clamp
13/32” Hose Clamp
3/8” Hose Clamps (x2)
Fuel Sock
Electrical Connector Harness

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15-17 Mustang DW400 Fuel Pump Installation Guide
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15-17 Mustang DW400 Fuel Pump Install
PLEASE READ –this guide is intended to aid in the installation of our products. It is recommended that
factory manuals or instructions are followed to remove the fuel pump assembly from the vehicle. Some
instructions in this guide are generic. The factory manual should supersede any contradiction. The
DW400 pump has a larger body than most in-tank pumps it will replace. Some cutting of the assembly
should be expected for proper fitment
Below is a picture of suggested tools that will make the installation process easier.

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15-17 Mustang DW400 Fuel Pump Installation Guide
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1 –remove the OE pump connector harness and fuel level sender, the OE pump connector harness will be
replaced by the supplied DW pump connector harness
2 –cut the smaller venturi outlet tube (1/8” ID) and remove the center section of the assembly by
depressing the 3 tabs (circled in green) around the perimeter and pulling the center up and out of the
bucket assembly. Remove the smaller venturi tube from the pump and the bucket assembly. It will be
replaced by the supplied DW 1/8”hose later

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15-17 Mustang DW400 Fuel Pump Installation Guide
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3 –carefully cut the larger pump outlet tube (3/8” ID) from the assembly filter and remove the OE pump,
the supplied DW 3/8”ID tube will be used later. DO NOT cut the 3/8”ID tube that connects the assembly
filter to the assembly top-hat (circled in green)
4 –remove the 3 locating tabs and smooth the pump receptacle to the diameter of the DW400 (46mm)

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15-17 Mustang DW400 Fuel Pump Installation Guide
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5 –install the supplied DW 3/8” tube onto the assembly filter inlet and slide on the two (2) supplied DW
hose clamps. Install the DW400 into the pump receptacle and install the supplied DW 1/8” hose onto the
venturi inlet receptacle of the assembly bucket
6 –install assembly center section into the assembly bucket and connect the 3/8” tube to the outlet of
the pump, then tighten the hose clamps. Slide the larger permanent clamp (13/32”) onto the hose and
crimp it in place (over the barbs) with a pair of side-cutters. Slide the smaller permanent clamp (11/32”)
on the hose and install the free end on the smaller venturi outlet on the pump. Crimp the clamp in place
under the barb
NOTE –removing the assembly top-hat from the assembly center section will allow for more room to
work to install the components

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15-17 Mustang DW400 Fuel Pump Installation Guide
6
7 –install the supplied DW connector harness, the additional static ground inserts into the slot on the
assembly filter, the same as OE
8 –reinstall the assembly top-hat to the center/buckets assemblies and connect the electrical connector
harness to the hat assembly. Reinstall the fuel level sender and connector the electrical connector to the
assembly top-hat
9 –reinstall the assembly into the fuel tank and attach a length of hose to the outlet of the pump
assembly allowing it to drain into a fuel safe container and prime the fuel pump assembly
10 –cycle the key to the on position as many times as required to prime the pump assembly and evacuate
the air introduced during the pump installation process
11 –attach supply line to the outlet of the pump assembly