TeleflexGFI is a Canadian company based in Kitchener, Ontario. TeleflexGFI is one of the world's pioneering propane injection system companies and produces systems used world-wide (outside of North America) and components for North American alternative fuel systems.

TeleflexGFI's web site is very sparse with useful information and much of the information used in this article was obtained from the Fuels Forum's Ford F150 Dual-Fuel Propane Systems topic. Many thanks to Franz Hofmann and C3H8 for their input.

Some Information about the Teleflex GFI System:

• Ford Bi-Fuel Supplement
• 1999-2002 Ford Bi-Fuel Vehicles Student Guide

The Teleflex GFI System is different than other gaseous fuel injection systems in that it performs much like an electronically controlled mixer.  It's a bit more like a TBI system than a MPEFI system because the fuel is supplied from a central metering point.  There are 2 (plastic-cased) low flow injectors that are pulse width modulated (PWM) and provide idle and trimming fuel flow.   The remaining metal-cased high flow injectors (6 for LPG, 5 for CNG) are on/off devices that provide progressively higher volumes of fuel when required during cruise and acceleration.  The fuel (CNG or LPG) is delivered through fuel rails to injector sleeves at each gasoline injector.