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Holley 450 LPH Pump Module - Returnless

1991-1997 Dodge Truck 450 LPH Pump Module System - Returnless with 105-5 OHM Fuel Sending Unit

PART# 12-321

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Update the fuel system in your Dodge truck with a high performance in-tank EFI fuel pump module. These fuel modules fit inside the factory tank & feature a billet aluminum flange, Hydramat®, fuel sending unit, and high performance pump. Choose from 255 or 450 LPH (liters per hour) fuel flow & return style or returnless design. The amazing HydraMat® is Holley's patent pending design that solves the problems associated with traditional fuel pick-ups in stock fuel tanks as well as racing fuel cells. During hard cornering, acceleration, stopping, inclines, and low fuel conditions fuel runs away from the fuel pick up which introduces air into the system resulting in poor engine performance and even stalling. HydraMat is the solution! Direct Fit in the following Vehicles: 1991-1993 Dodge D150/D250/D350 (2WD Full Size Pickups) 1991-1996 Dodge Dakota (2WD & 4WD) 1991-1993 Dodge W150/W250/W350 (4WD Full Size Pickups) 1991-1993 Dodge B150/B250/B350 (Full Size Vans) 1995-1997 Dodge B1500/B2500/B3500 (Full Size Vans) 1994-1997 Dodge Ram 1500/Ram 2500/Ram 3500 (2WD & 4WD Full Size Pickups) 1991-1996 Dodge Ramcharger (2WD & 4WD - 1994-1996 are Mexico Only)


  • High Performance In-Tank EFI Fuel Pump Modules for 1991-2004 Dodge Trucks
  • Billet Aluminum Flange, Clamp & Fuel Level Sender
  • Black Anodized Finish
  • Choose from 255 or 450 LPH (liters per hour) Pump
  • Adjustable for Tank Depth
  • Choose from Return Style or Returnless Fuel Module
  • Provisions for EVAP (Evaporative Emission Control System) – See the Installation Notes
  • Inlets & Outlet Ports: -8 AN O-Ring Boss
  • New Fuel Level Sender Included
  • Optional Fill Vent Built Into Billet Aluminum Top – See the Installation Notes
  • Includes Hydramat® - 3” x 15”
  • Fits in Stock Factory Fuel Tanks
  • Ideal for Use In Gen III Hemi Engine Swaps


Amp Draw22
Application1991-1997 Dodge Trucks
Emission Code5
Forced Induction HP@60PSI750
Free Flow GPH139
Free Flow LPH450
Fuel Sending Unit Ohms105-5 Ohms
Fuel SystemEFI
Fuel TypeE85
MaterialBillet Aluminum and Steel
Naturally Aspirated HP@60PSI1000
Outlet Size8 AN
Product TypeFuel Pump Module
Pump Body ColorSilver
WarrantyLimited 90 Day
Part Number12-321



This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.

Tech Resources

Filler Neck Vent - Some vehicles will have a 3/4" filler neck vent line that goes to the flange on the fuel module. If this is the case for your vehicle, you will need to purchase the following Earl's fittings: AT949013ERL and AT700113ERL. EVAP Line - Some vehicles will have a small EVAP hose that goes to the flange on the fuel module. If you wish to retain this, the following parts will need to be purchased: AT984204ERL, and 12-874. Thread sealant with PTFE will also be needed - Use Earl's # D024ERL. The 1991-1993 Dodge D100/D150 fuel tank can be retrofitted into the 1988-1990 trucks, and these tanks can use this fuel module, but an aftermarket fuel gauge will be required to work with the 105-5 Ohm sending unit. A different fuel gauge sending unit could also be used with the factory fuel gauge (it uses 73-10 Ohm).

Warranty Information

Limited 90 Day: See Details


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