Flowmax Heater Installation Manual - 1050346 Heater Kit for the BD Flowmax System

Oct 28, 2026

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FlowMax Fuel Heater installation manual for kit P/N 1050346, describing an add-on fuel lift pump system accessory that activates with the FlowMax fuel pump to prevent cold-diesel waxing or gelling. Provides a kit contents checklist with part numbers, installation overview, and system-specific heater connections for BD FlowMax, AirDog, and FASS setups. Includes torque guidance, sealing-ring handling, blue thread-lock usage, and recommendations for filter replacement during installation.

LanguageEnglish

CategoryTechnology

FormatPDF

Pages10

Reading Time25 min

AccessFree to download

Installation Instructions

Kit Contents and Part Numbers

Introduction and Function

Installation Steps

Heater Connections by System (BD Flowmax, Air Dog, FASS)

Additional Notes and Warnings

DOWNLOAD ENHANCED INSTALL MANUALS AT [dieselperformance.com](dieselperformance.com) Flowmax Heater Installation Manual Installation Instructions | P/N \# | 1050346 | | --- | --- | | P/N \# | 1050347 | | P/N \# | 1050348 | PLEASE READ ALL INSTRUCTIONS BEFORE INSTALLATION K I T C O N T E N T S : Please check to make sure that you have all the parts listed in this kit before you start |
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1050346 – HEATER KIT FOR THE BD FLOWMAX SYSTEM | | | | | --- | --- | --- | --- | | 1500343 | 1500342 | 1302174 | 1500375 | | | | | | | Heater | Nut; 3/4”-16 | Thread Lock (BLUE) | Adapter | | Qty: 1 | Qty: 1 | Qty: 1 | Qty: 1 | | | | | | | 1500420 | | | | | | | | | | Harness; Fuel Heater Flowmax | | | | | Qty: 1 | | | | the disassembly of your truck | 1050347 – HEATER KIT FOR THE AIRDOG SYSTEM | | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | | 1500343 | | 1500342 | | | 1302174 | | | | | | | | | | | | | | | Heater | | Nut; 3/4”-16 | | | Thread Lock (BLUE) | | | | | Qty: 1 | | Qty: 1 | | | Qty: 1 | | | | | | | | | | | | | | | 1500420 | | | | 1500376 | | 1500407 | | | | | | | | | | | | | | Harness; Fuel Heater Flowmax | | | | Adapter (Airdog 1) | | Adapter (Airdog 2 & Airdog 2-4G) | | | | Qty: 1 | | | | Qty: 1 | | Qty: 1 | | | | 1050348 – HEATER KIT FOR THE FASS SYSTEM | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | | 1500343 | | | 1302174 | | 1500377 | | | | | | | | | | | | | Heater | | | Thread Lock (BLUE) | | Adapter | | | | Qty: 1 | | | Qty: 1 | | Qty: 1 | | | | | | | | | | | | | 1500420 | | | | | | | | | | | | | | | | | | Harness; Fuel Heater Flowmax | | | | | | | | | Qty: 1 | | | | | | | | Optional Accessories: | 1050350- | WIF Sensor 2000-07 Dodge 5.9L | | --- | --- | | 1050351- | WIF Sensor 2007-12 Dodge 6.7L | | 1050355- | WIF Sensor Universal | | 1050356- | WIF Sensor Ford 2003-10 | Introduction The BD FlowMax Fuel Heater is an add on accessory for the BD FlowMax fuel lift pump system. It installs in conjunction with the BD 1050340-WSP water separator filter assembly. The supplied wiring harness automatically triggers the heater on when the FlowMax fuel pump is running. Cold diesel fuel is susceptible to waxing or gelling. This solidification causes the fuel filter media to become partially clogged leading to fuel delivery issues. Fuel heaters help keep diesel fuel warm to prevent this problem and ensure a continuous fuel supply regardless of ambient temperature. The BD Fuel Heater installs between the incoming fuel supply and the water separator filter, heating the cold fuel as it enters the filter. The BD Fuel Heater is a high power heater, far outperforming the competition. As the temperature drops the heater output increases to help maintain fuel temperatures. As the fuel temperature rises, the heater reduces its output to reduce wasted heat generation. Installation: | | FILTER REPLACEMENT AT THE TIME OF THE HEATER INSTALL IS ALWAYS RECOMMENDED. | | | --- | --- | --- | | 1) Remove water separator filter and adapter from head if installed. | | | | 2) Install fuel heater threaded adapter (\#1500375) into the Flowmax water separator head.
Use supplied thread lock to secure fitment.
Tighten with 1”wrench. Do not over tighten.
5 ft/lbs is sufficient. | | | |
3) Heater connection on a BD Flowmax System
a) Lubricate sealing ring surface with engine oil. Place sealing ring into heater receiving groove and slide the heating unit (\#1500343) up against the filter head.
NOTE: It is suggested to replace the sealing ring when replacing the water separator.
Dodge\# 4429695 Cummins\# 3913695 Fleetguard\# 3834185S |

ADAPTER

| | --- | --- | | b) Place a dab of blue thread lock onto the adapter then, thread the supplied panel nut (\#1500342) onto the threaded stud, thereby secur

FAQs

What should be done regarding the water separator filter during installation?

Filter replacement at the time of the heater install is always recommended, and the installation steps include removing and reinstalling the filter components as needed.

Oct 28, 2026

Upload by McQueen