Fuel System Basics
Setting Fuel Pressure on DI/Port Systems with Two Regulators
Gen3 and Gen4 Coyote motors (2018+ Mustangs and F-150) are fueled by Direct Injection (DI) and port injection. These two systems are fed with the same low pressure feed line and fuel pump, but the DI pump has different inlet requirements than the ...
Base Fuel Pressure (port injection, one regulator)
Your vehicle's OE fuel pressure may be 58 psi...but that is irrelevant with an upgraded fuel system that uses an entirely different regulation strategy. (especially if it has added forced induction) In the context of port injection, base fuel ...
Hobbs Switch Failures
There is a myth that pressure switches are unreliable and/or subject to failure. We've actually never seen a failed pressure switch, but we've seen plenty of failures in applications or mis-uses. 1. Using without a relay. Honeywell specifies 10A ...
Fuel Pump Replacement
High performance fuel pumps are a low cost wear item used in a very demanding environment. Do not expect them to last as long as a typical Original Equipment (OE) pump. With proper setup, use, and maintenance, your high performance pumps may last for ...
Pipe Threads (NPT)
Pipe threads naturally have a leak path that follows the root of the thread, so it must be sealed. We only use and recommend Loctite 567. Some of our customers choose to use Permatex 80631 or PTFE tape, but we strongly recommend Loctite 567. Do not ...
Fuel Filter Maintenance
The fuel pressure regulator will automatically compensate for restriction in the inline fuel filter, so the fuel pressure before the filter will be higher than observed rail/regulator fuel pressure. This increased fuel pressure is unnecessary load ...