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Old 04/03/2017, 09:46 AM   #46
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Originally Posted by robert campbell View Post
Need a 1/2 inch fuel sending unit with a return line fitting?? Had this one on my GNS!!!

Ron Morris used to sell a sender configured in the same way but I can't find it on line anymore. This type of sender with a Holley Hydramat hooked to it (instead of the filter sock) *might* be the solution to fuel slosh. (Side note: The vent line from a FCC cannot be hooked to this type of return but must "vent" to a location above the fuel level).

He also has a version of the FCC that he sells that some people are using instead of the FiTech FCC (because of lingering issues with the FCC)

One thing to consider when picking a fuel pump (either in-tank, in-line, or FCC style sump w/pump) is whether it can handle a PWM (rapid on/off cycling) controller. I believe FiTech controls the pump with a PWM. Some (older?) pump designs were designed for constant running (with return line), cannot handle the rapid on/off cycling of PWM controller, and will eventually burn out. My (limited) understanding is that turbine-style pumps can handle PWM control where as other styles (eg. gerotor) cannot.

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Old 04/03/2017, 02:05 PM   #47
robert campbell
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Boy are we (you) zeroing in on many of the complications if not all! Thanks for your research. I had no idea that Robb MC had this! I was more than happy with the quality of the sending unit I purchased!

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