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Fuel Tank Caps

All Cap designs/styles are for Diesel Fuel Tanks and have been "Drop Tested" to meet DOT qualifications for HWY Transportation Fuel Tank safety.  

Ordering Notes:  

  • All of our fuel caps are female thread style (unless stated otherwise) i.e. Peterbilt lever style, Freightliner cam-cap style.
  • Always measure the inside diameter (ID) of Fuel Cap for a more positive Identification if there is any question as to which Cap to use.
  • Always make sure the Tank is either Vented or non-Vented in order to Identify correct Vented or Non-Vented Cap. (note: a Vented Cap is made to work with a non-Vented Tank; it is also safe to use on a Diesel Fuel Tank that is already Vented; a non-Vented Tank Must have a Vented Cap to operate properly).
  • Should the Cap not be available to measure - measure the outside diameter (OD) of the Fill Tank Neck to determine inside Diameter (ID) of Cap.
  • Please feel free to call us should you have any questions about a cap application fit.

Please note: Some Older Freightliner and Peterbilt Truck Fuel Tanks (Pre mid 1990's), and many Western Star Tanks use a 3.5"-5.5 NS threaded Cap (Same as the Current Kenworth Class 8 Trucks) or a 3" Cap.  Also, though Steel Tanks are not as common in the HD Truck Industry as Aluminum, it is recommended to clarify whether the tank is Aluminum or Steel. i.e. many International Trucks have steel (Borg Warner) tanks which require a 2" UN threaded Cap (FTA-C-74 or FTA-C-14-03).  The inside diameter (ID) of some Caps used with Low-Sulfur labeled Diesel Fuel Tanks are smaller and have different treads than Caps used with Diesel Fuel Tanks that have no Low Sulfur Label. (See the Volvo Description as an example)

Terminology Definitions

SCH                     Schedule

NPSM                  National Pipe Straight Medium

NPSH                   National Pipe Straight Hose

NPSL                    National Pipe Straight Loose

UNNS                   United National Non-Standard

UN                        United National

Triple Lead          Three Starts – Threads

NS                         Non-Standard

Bail                        End of chain connection

Full Function        Thermal – Pressure – Vented

Thermal Relief     Over Temp Safety Feature

Pressure Relief    Over Pressure Safety Feature

Alum Cap #               (Matching Chrome Cap #)

     FTA-C-02                          FTA-C-02C

     FTA-C-69                          FTA-C-70

     FTA-C-80                          FTA-C-51C

     FTA-C-97                          FTA-C-97C

     FTA-C-50                          FTA-C-50C

     FTA-C-722                        FTA-C-722C

     FTA-C-722L                      FTA-C-722LC

     FTA-C-442                        FTA-C-442C

     FTA-C-442L                      FTA-C-442LC

     FTA-C-74                          FTA-C-74C

     FTA-C-13                          FTA-C-13C

     FTA-C-12                          FTA-C-12C

     FTA-C-93                          FTA-C-93C

     FTA-C-92                          FTA-C-92C


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