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3998878C91 Genuine International DEF Tank Assembly
3998878C91 Genuine International DEF Tank Assembly
3998878C91 Genuine International DEF Tank Assembly
3998878C91 Genuine International DEF Tank Assembly

3998878C91 Genuine International DEF Tank Assembly

P/N: 3998878C91 Manufactured by: International
$375.00 - $375.00
$375.00
$375.00 - $375.00
$375.00
1 in Stock
Condition: New
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At Line Truck Parts LLC, we are committed to providing reliable automotive parts and a transparent customer experience. Eligible parts purchased directly from our website are covered by a 2-Year Limited Warranty, giving you added confidence in your purchase. Learn More

Product Overview

The 3998878C91 is a genuine International 7-gallon DEF tank assembly built as a blow-molded reservoir for diesel exhaust fluid storage within the emissions system. This tank keeps DEF available for the SCR dosing circuit, allowing the system to draw fluid from the correct reservoir during normal engine and emissions operation.

Product Features

The 3998878C91 DEF tank assembly is manufactured to International factory specifications for diesel exhaust fluid storage and supply.

  • Supports 7-gallon DEF storage within the diesel emissions system circuit
  • Uses blow-molded construction to form the tank body and reservoir shape
  • Maintains available DEF volume for the connected SCR dosing components
  • Integrates with the original tank location and related mounting points
  • Connects with the vehicle DEF supply routing and attached system hardware
  • Assists controlled DEF handling between the reservoir and dosing system

Technical Specifications

Condition New
Part Number 3998878C91
Brand International
Part Type DEF Tank Assembly
Capacity 7 gal
Weight 15.0 lbs


Installation Notes

The 3998878C91 should be positioned only after the mounting area, DEF line path, tank ports, and surrounding brackets are checked for interference or misalignment. Once the tank is secured, confirm the connected lines are not twisted or pulled tight, then inspect the filled system for seepage around the tank connections.

Always verify the DEF tank volume, part number, mounting location, port orientation, and SCR emissions system layout before installation.