Ford Mustang Stock Fuel Injector Size Chart

Created by Tyler Rodriquez / 4 min read
Date Created: 4/11/2017
Last Updated: 7/23/2024

Looking for the factory specs of your Mustang's stock fuel injectors? Check out this easy to use Mustang stock fuel injector size chart!

Viewing this install and using the information shared is subject to the terms set forth here - View the LMR Install Instructions Disclaimer.

Mustang fuel injectors are a vital part of your motor as they supply your engine with the correct amount of fuel for your application. Knowing your stock Mustang fuel injector size can help you in judging if you have the correct size injectors for your application.

Mustang Stock Fuel Injector Size Chart

Ford Mustang Fuel Injector Size Chart

1984-85 SVO30lb/hr--
1985.5-86 SVO35lb/hr--
1987-02' LX, 5.0L, GT, Bullitt19lb/hr--
2003-04 GT21lb/hr--
1993 Cobra24lb/hr--
1996-98 Cobra24lb/hr--
1994-98 V614lb/hr--
1999-04 V6-22lb/hr-
2005-10 GT-24lb/hr-
1999-01 Cobra-24lb/hr-
2003-04 Cobra-39lb/hr-
2003-04 Mach 1-24lb/hr-
2005-10 V6--19lb/hr
2011-17 GT--34lb/hr
2007-12 GT500--47lb/hr
2013-14 GT500--52lb/hr
2015-17' V6--29lb/hr
2015-23' EcoBoost--24lb/hr *Excludes HPP EcoBoost
2016-20' GT350--34lb/hr *Includes GT350R
2018-23' GT--28lb/hr *Estimated
2021-23 Mach 1--28lb/hr *Estimated
2020-22 GT500--55lbs/hr
*The listed flow rates for 2018-23 models are for the Port Fuel Injection on the Ecoboost and GT/Mach 1. The GDI pump determines the fuel flow rate for the Direct Injectors. They will not be listed on this chart.*

Calculating Fuel Injector Size

The formula for calculating the correct size fuel injector for your Mustang is calculated by:
Injector Flow Rate (lb/hr) = (Engine HP) x (BSFC) / (Number of Injectors) x (Injector Duty Cycle)

If you are trying to compare injector flow rates and you have flow data at one delta pressure, you can easily calculate the flow rate at a different delta pressure as follows:
Flow rate at new delta pressure = (flow rate at old pressure) x v(new pressure/old pressure)

Engines require a certain fuel flow rate that is generally measured in lb/hr (pounds per hour) and can be calculated via knowledge of its Brake Specific Fuel Consumption (BSFC). BSFC represents how much fuel (in-lb) is required per hour per each brake horsepower the engine produces. More clearly stated, this means that if you have a gasoline engine that makes 300 brake horsepower, its total maximum fuel requirement in lb/hr can be calculated as follows:
Fuel flow requirement = (brake horsepower) x (BSFC)

This calculation can also be reversed to give the maximum safe hp a set of injectors can support, which gives:
Max safe hp = [ (injector size) x (total # of injectors) x (max duty cycle) ]/BSFC

Example: The following guide is a general rule of thumb for sizing fuel injectors on an 8-cylinder engine using a BSFC of 0.50. Forced-induction engines typically range from a BSFC of 0.55 to 0.65, with the latter value arising from the fuel enrichment necessary to keep exhaust temperatures below 1650 deg F and catalyst temperatures below 1750 deg F.

Naturally Aspirated: (19 lb x 8 x .85)/.50 = 258.4 or approx 258 hp @ 85% duty cycle Forced-Induction @ 0.55: (19 lb x 8 x .85)/.55 = 234.9 or approx 235 hp @ 85% duty cycle Forced-Induction @ 0.65: (19 lb x 8 x .85)/.65 = 198.8 or approx 199 hp @ 85% duty cycle

Ford Mustang Fuel Injector Size Chart

Inj Flow Rate (@ 40psid)Naturally Aspirated hp (@ 0.50)Forced-Induction hp (@ 0.65)
19 lb/hr258 hp @ 85% Duty Cycle199 hp @ 85% Duty Cycle
24 lb/hr326 hp @ 85% Duty Cycle251 hp @ 85% Duty Cycle
30 lb/hr408 hp @ 85% Duty Cycle314 hp @ 85% Duty Cycle
32 lb/hr435 hp @ 85% Duty Cycle335 hp @ 85% Duty Cycle
34 lb/hr462 hp @ 85% Duty Cycle356 hp @ 85% Duty Cycle
36 lb/hr490 hp @ 85% Duty Cycle377 hp @ 85% Duty Cycle
38 lb/hr516 hp @ 85% Duty Cycle398 hp @ 85% Duty Cycle
39 lb/hr530 hp @ 85% Duty Cycle408 hp @ 85% Duty Cycle
42 lb/hr571 hp @ 85% Duty Cycle439 hp @ 85% Duty Cycle
44 lb/hr598 hp @ 85% Duty Cycle460 hp @ 85% Duty Cycle
47 lb/hr639 hp @ 85% Duty Cycle492 hp @ 85% Duty Cycle
60 lb/hr816 hp @ 85% Duty Cycle628 hp @ 85% Duty Cycle
72 lb/hr979 hp @ 85% Duty Cycle753 hp @ 85% Duty Cycle
80 lb/hr1088 hp @ 85% Duty Cycle837 hp @ 85% Duty Cycle
98 lb/hr1333 hp @ 85% Duty Cycle1025 hp @ 85% Duty Cycle

Remember, the above calculations assume a fuel pressure of 39.15 psid. If you can raise fuel pressure and still be sure that your fuel pump can supply the desired flow rate, then these maximum horsepower numbers will increase.
Thumbnail image of the author of this article, Tyler Rodriquez.

About the Author

Tyler has written content for Late Model Restoration for nearly 8 years, producing over 300 articles. As an avid New Edge fan, Tyler has owned 4 2004 Mustangs and an 88 Convertible Fox Body. Read more...