The majority of Fass kits are vehicle specific and come with all parts needed for installation. The Class 8 kits require a fuel return line kit to complete installation.
FASS is continuously updating and changing units to make them easier to install for the end user. As long as you take your time, read and follow the provided installation manual, installs can be completed by the end user.
After the installation of the Titanium series unit, customers have reported 2-3 mpg increases for pickups and .4 mpg increases for Class 8. While this is an average, FASS does not guarantee fuel mileage increases.
No, FASS does not void factory manufacturer warranties because our products meet their filter specifications.
A loud pump can be caused by several issues. Clogged filters will cause the pump to cavitate and become loud. If a restriction is present on the suction side of the fuel pump there will be excessive cavitation which will cause the noise of the pump to increase. Majority of the time a restriction on the suction side of the pump will be a clogged screen on the bottom of the fuel module inside the fuel tank. Excessive pressure could also cause the unit to over amp and become loud. A fuel pressure gauge will be needed to determine the pressure.
If your unit is not equipped with a STK/sump bowl, the factory fuel module supplies the FASS pump. Factory fuel modules are equipped with a filtering screen which, over time, can become clogged by the contaminates found in diesel fuel. When the fuel level starts to go down to ¼ tank and below fuel can’t enter the basket from the top anymore. If the screen is clogged and not allowing fuel to enter, the FASS pump will empty this basket before it can refill causing the truck to run out of fuel.
The VP44 injection pump is equipped with a diaphragm and this diaphragm can develop a crack in it which will allow fuel to seep past it during start up. This issue is not necessarily from high fuel pressure. For testing procedures and solution please refer to page 26 of the troubleshooting guide.
Yes and no. To a point, you can have more flow than you need but you DO NOT want excessive pressure. Many customers choose to purchase a 150gph pump for the stock/mild upgrades because the price difference between the 95gph and 150gph is so little. This is fine as the pressure will still be at the recommended pressure for your vehicle. Having a pump that is larger than 150gph on a stock or slightly modified truck can cause issues. Vehicles that actually need larger units are mainly purpose-built competition vehicles and can handle higher pressures. Along with other competition specific parts, these pumps are going to be much louder. Performance of the motor will produce added pressure which will create more amp draw and lessen the electric motor life.