Quick Fuel Technology Qfi Electronic Fuel Injection System - Manual (Page 9)

9

If not present, install a free-flowing vent
in top of tank (REQUIRED). The vent
should be a MINIMUM of a ¼-in. (0.250
in/6 mm) diameter. A vented filler cap is
not adequate for this system.
o The vent tube should have no kinks,
with the opening pointed to the top
of the tank (upside down “U”) to
minimize debris from entering the
tank.

Install return fuel line (REQUIRED) to top
of fuel tank (may require placing a hole in the top of the tank to install bung).
o Use a barbed-style fuel line fitting
o Route the return line to top of the engine
o This line is a low pressure line, and needs only standard 3/8 in. (0.375
in./10 mm) fuel line
o This line should be securely fastened (with no slack in the line), keep line
away from heat source (or shielded if not possible) and fasten securely
to chassis next to the floor pan.
o Attach securely with a worm-gear or spring style hose clamp at each end
Step 4:
Installing the Fuel Pump and filter

Begin by installing a 3/8 in. (0.375 in. /9.5 mm) barbed fuel line fitting in the fuel tank outlet.

If the tank’s fuel outlet is less than 3/8 in. (many fuel tanks for carbureted applications will have
5/16 in. outlet), you must a install a 3/8 in. bung (If using braided steel line, a 3/8” NPT/-6 AN
adapter fitting must be used)

Check to be certain the fuel line from the tank will be ABOVE the fuel pump inlet port
IF USING THE QFT 500 SYSTEM BASE KIT (QFT-500BD) READ THIS!

Install a sock (or) screen type pre-filter in the gas tank. It will be adequate to
capture any large debris that can damage the fuel pump.

The other option is an in-line 100 micron pre-filter between the tank and pump
IF USING THE QFT 500 SYSTEM MASTER KIT (QFT-500BDM) READ THIS!

The fuel pump has a 100 micron pre-filter built into the pump (It is a white filter
you can see just below the pump’s Inlet fitting). This can be cleaned by back
flushing -- removing the pump and pouring fuel through the pump from the outlet
end of the pump.