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Weldona, Colorado 970-368-4455

DieselOrings is a small, family owned and operated business located in the sparsely populated plains of Northeastern Colorado.
UPS is delivering orders in a reasonable time compared to what we see with USPS.
Please understand that these delays are out of our control.
  3/26/2020 - UPS has suspended Guaranteed Delivery for Next Day Air, 2nd Day Air, 3 Day Select and Ground.
UPS has denied all claims for missed delivery dates. (LINK)


#7-003 1999-2003 Fuel Bowl Reseal Kit 7.3L

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#7-003 1999-2003 Fuel Bowl Reseal Kit 7.3L


Availability: In stock

Complete Fuel Bowl Seal Kit 1999-2003
Select the type of Drain Valve O-rings below.

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Complete Fuel Bowl Seal Kit 1999-2003 -- All of our O-rings are Made in the USA for the original OEM Fuel Bowl and drain valve!

Differences between the black Viton (A), or the Blue Fluorosilicone fuel drain o-rings sold on this page: 

Black Viton Type A The black Viton o-rings are polymerized from two monomers, vinylidene fluoride and hexafluoropropylene (Viton type A). The low temp flexibility of Viton(A) is -2deg F but will continue to perform well in our type of service at a much lower temperature (-20 F)

Blue Fluorosilicone The Blue Fluorosilicone elastomer is a Military Specification material that has a much wider temperature range than Viton (A) and is widely used where fuel contains corrosive agents that are found in ULSD. Bio and veggie fuels. They will stay flexible in arctic conditions down to -70º F and can withstand temperatures in excess of 400 F.

Includes o-ring size identification comparison and location chart. Shipped with order.

Complete Fuel Bowl Rebuild Instruction Sheet - 10 Pages! :

You must have Adobe Acrobat reader installed on your computer to download this document.

Featured Tech Article in 8 LUG magazine June 2010 using this kit


This complete 11 Viton o-ring reseal kit contains:

  1. 3 Viton (type A) or 2 Fluorosilicone plus 1 Viton o-rings for the 7.3 yellow fuel drain valve.
  2. 2 o-rings for the Water-in-Fuel sensor/Fuel Heater
  3. 1 o-ring for the Fuel Pressure Regulator housing
  4. 1 o-ring for the regulator piston bushing
  5. 2 o-rings for the fuel back check piston assembly
  6. 2 o-rings for bowl plugs
  7. 2 - 1/4" sleeves for the fuel lines feeding the cylinder heads
  8. 1 - 5/16" sleeve for the fuel return line
  9. 1 - 3/8" sleeve for the fuel feed line.


NOTE: This kit does not contain the REGULATOR POPPET SEAT. This is a separate kit only available as a FORD kit. The Regulator Rebuild kit can be purchased separately as Part # 7-028 .

If you remove the fuel rail lines from the cylinder heads, this kit contains the fuel sleeves for the filter bowl ends only. It is recommended to also replace the sleeves on the cylinder head end of the fuel rail lines once they have been removed as they will no longer seal properly.  Order part # 7-004 to supplement this kit.

Note on the Fluorosilicone Option: 

Fuel Drain Valve o-rings: A set of 2 High Quality Fluorosilicone MilSpec M25988/2 O-rings for the Fuel in Water drain valve and 1 Viton O-ring for the valve stem. For the drain valves on both the 1994.5-1997 trucks and vans along with the 1999-2003 trucks and vans.


Choices of Types of Drain Valve o-rings

  • Black Viton bi-monometer compound-Viton (A)
  • Blue MilSpec M25988/2 Fluorosilicone. (FVMQ)
Parker From Parker Hannifin :

"In the automotive market, fluorosilicones are the seal material of choice for handling gasoline, E85, diesel fuel, biodiesel and ULSD at extremely low temperatures."


 Item #7-003

Order of 1 is a set of 11 o-rings and 4 sleeves.

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