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Ford Six Fuel Return Lines Print E-mail
Many people want to just use a simple pre 1983 style fuel delivery system, becasue it looks simple and simple is gooood!

Good new is that the X-flow's with return lines give you heaps of options without expense


1) My preference is to just plumb up a return line to the fuel tank breather line, and dump raw fuel from the return line into the fuel tank.
If the hose is beside the existing fuel line, and of simialr quality, it will be the cheapst thing to do.

Other options are

2) If you decide to block off the return line, you have to run a Carter or Holley fuel regulator close to the carb.

3) use the imported 1971 to 1982 XY to XD Falcon fuel pump top body, which has no return line, and fits to your XE fuel pump.
Run a Carter or Holley fuel regulator close to the carb.


4) or spend a few hours adding the US 200 or 250 Carter fuel pump with the Aussie lever, running a Carter or Holley fuel regulator close to the carb.


Why is the return line used?

The reason Ford Australia added it to everY Weber equiped Pinto engined four cylinder since 1973, and every Weber equiped six cylinder from mid 1982 was because of

1. fuel vapourisation (hot fuel handling problems),
2. fuel leaks (Webers leak fuel above 5 psi),
3. hydrocarbon emissions,
4. fuel fires,
5. and the quest for better fuel economy (lower needle and seat pressures reduce the over supply of fuel on bumpy or hard cornering conditions).
6. Before the advent of return lines, all Cortinas and Falcons had chronic fuel surge problems around corners because of fuel starvation. Weber AD carbs with return lines are just brilliant in that situation, because they were orginally used in the French Simca 180's with soft suspension, and the Weber AD series used in these were resistant to fuel surge.

Eliminate the return line, and all six items become issues. Even ripping off the evaporative emissions increases green house gas emission by 20%!


In the XE to XF engines, the Weber ADM 34 recieves 5 to 6 pounds of pump pressure, just like the early ones.
What is different, is the carb bleads off the other 2 to 2.5 pounds of pump pressure by virtue of a 0.5 mm bleed line out of the needle and seat valve.
So the carb only sees 2.5 to 3 psi tops in operation.

 
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