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Old 05-29-2010, 02:54 PM
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Fuel cell return line question

Hey guys, always appreciate your input. I am currently mounting a fuel cell in the bed of my truck.







I am using a mallory 4309 return style regulator attatched to the Carter 72gph electric fuel pump mounted on the crossmember below where the sump comes through the bed. The Sump on the cell has two -8 male fittings, obviously one needs to get used for the feed to the pump, can I use the other -8 fitting in the sump as the fuel pressure return? Will the weight of the fuel in the cell trying to exit out of the sump fight the fuel pressure return?

Cheers ~Mykk
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Old 05-29-2010, 08:39 PM
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You cannot use the other outlet fitting as a return, it has to come back to the cell near the top or in the top.
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Old 05-29-2010, 09:02 PM
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Thank you Ericnova
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Old 05-29-2010, 09:28 PM
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Old 05-31-2010, 07:49 AM
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Thanks for the help, finished plumbing up the cell. The rubber fuel line is temp until I can afford some track approved fuel lines.



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Old 05-31-2010, 09:41 AM
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Don't know if you want to change things at this point but the system would be a lot better with the regulator up close to the carb. Right now you are cutting the pressure down when the fuel is still a long ways from the carb, meaning all you are pushing up the line is low pressure.

You want to have full volume and pressure to up near the carb and THEN cut the pressure down with a regulator and send the remaining back to the tank.

Those hardware store brass fittings are typically quite restrictive(small bore thru hole), especially that hard 90 on the return port of the regulator. Hope those are coming off when the real line goes on.
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Old 05-31-2010, 11:08 PM
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they will make you cover the sump area also with 20guage also
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