DeatschWerks Mustang DW400 User manual

DeatschWerks
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

DeatschWerks
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.

DeatschWerks
15-17 Mustang DW400 Fuel Pump Installation Guide
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1 –remove the OE pump connector harness and fuel level sender
2 –cut the smaller venturi outlet hose (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

DeatschWerks
15-17 Mustang DW400 Fuel Pump Installation Guide
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3 –carefully cut the larger pump outlet hose (3/8”ID) from the assembly filter and remove the OE pump
4 –remove the 3 locating tabs and smooth the pump receptacle to the diameter of the DW400 (46mm)

DeatschWerks
15-17 Mustang DW400 Fuel Pump Installation Guide
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5 –install the 3/8”tube onto the assembly filter inlet and slide on the two (2) hose clamps. Install the
DW400 into the pump receptacle and install the 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

DeatschWerks
15-17 Mustang DW400 Fuel Pump Installation Guide
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7 –install the new connector harness supplied with the DW kit, the additional static ground inserts into
the slot on the assembly filter, the same as OE
8 –reinstall the hat to the assembly in the center/buckets assemblies and connect the electrical
connector harness to the hat assembly
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