fuel return line size
I have a 30002 (600HP) system and just purchased the 50001 fuel delivery system. I have a 5/16 sender line which I would like to use as my return. The instructions (Figure 3 welded pipe version) shows a 5/16 pipe connected to AN6 hoses which I thought were 3/8".
My question is 5/16 return line sufficient for a 30002 system running a little over 300HP (360 Mopar) and a 13 foot run(5/16") hose.
Thanks, Dan
I think it is recommended to use AN6 (3/8") for return line. Having 5/16 for that length may introduce back pressure, which would raise you regulated pressure. Exactly how much I'm not certain.
Really depends on your fuel pump. If you have a super large GPH inline pump then the lines would be too small. If the pump is "right sized" for your HP then I think you'll be OK.
The only way to know for sure is to put on a fuel pressure gauge at fitech fuel inlet. If the pressure goes much above the regulator rated pressure, it's too small. Why take the chance IMO.
I called FiTech support and there requirement is 3/8 return line, I also told them their instructions (figure 3) shows a 5/16 return pipe as an option, they told me that is incorrect. I hope they update the figure because I bought 5/16 line and hardware and spent an afternoon running it based on this option.
They show 5/16 pipe connected to -6AN hose you cannot connect -6AN (3/8) hose to 5/16 pipe. I wish they would proof read their instructions.