Quote:

---

The size of the feed line is dependent on the horsepower the engine produces. The size of the return line depends on the size of the fuel pump, regardless of the hp or the size of the feed line. A larger pump requires a larger feed line to return the unused fuel back to the tank.

The following is from a magazine article I wrote about ten years ago:



"The minimum fuel line size (from the pump to the regulator) is dependent on the horsepower output of the engine (and/or Nitrous system) regardless of the size of the pump.


* Up to 250HP = 5/16" or -04 AN
* Up to 375HP = 3/8" or -06 AN
* Up to 550HP = 1/2" or -08 AN
* Up to 800HP = 5/8" or -10 AN
* Up to 1200HP = 3/4" or -12 AN

If you use a return-style regulator, you will also need a return line from the regulator back to the tank. The size of the return line is dependent on the size of the pump you are using, regardless of the engine's horsepower output. The return line must have limited or NO pressure in it. In many cases, the minimum return line size will match that of the supply line, but a larger return line is sometimes required if the pump is larger than necessary.


* Up to 45GPH = 5/16" or -04 AN
* Up to 90GPH = 3/8" or -06 AN
* Up to 200GPH = 1/2" or -08 AN
* Up to 360GPH = 5/8" or -10 AN
* up to 720GPH = 3/4"or -12 AN

---

this should be saved