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Old 04-24-2021, 08:14 PM   #1
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Ford Lehman fuel return tubing

My engine has a 1/4" copper tubing for the fuel return to tank. Next to the engine it makes a few spiral turns (see photo). Can anyone confirm the reason for the spiral coil? I think it is either to give flexibility or, perhaps, to cool the fuel before it goes too far.

I would like to replace the copper with 1/4" fuel hose. Does anyone see a problem with this?

Nick
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Old 04-24-2021, 08:24 PM   #2
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Greetings,
Mr. NF. I think you're right with the flexibility comment. I see no purpose in cooling the fuel before it returns to the tank and the Lehmans return so little. Wouldn't like to comment on the rubber fuel hose other than it would eliminate vibration similar to existing set-up.
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Old 04-25-2021, 12:41 AM   #3
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Contact Brian at American Diesel. 804-435-3107. He is the guru on Lehmans.
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Old 04-25-2021, 01:13 AM   #4
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My 120s have rubber fuel hose for returns. You'll be fine nixing those coils.
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Old 04-25-2021, 05:48 AM   #5
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1/4 in rated fuel line on mine. 3700 hr of just my time in last 10 yrs with no problems.
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Old 04-25-2021, 10:44 AM   #6
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Thanks Scott and Scott (Bligh and Psneeld),

How is your connection made at the engine? Is the hose just slid over a stub of copper tube?

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Old 04-25-2021, 11:44 AM   #7
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Coiled tubing is not original to engine. PO added it. I replaced all of my Cu tubing with hose. As I recall Amazon sold most of the hose and hardware I needed.
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Old 04-25-2021, 01:00 PM   #8
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coiled tubing was used by some as a transition zone against vibration issues. That many coils suggests the tube was much longer than needed so why not keep coiling.
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Old 04-26-2021, 07:44 AM   #9
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I wouldn't keep that coiling. Just another place to hook on, tug, displace, break, get in the way. Wholly unnecessary especially when one considers that a FL120 returns ounces per hour.
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coiled tubing was used by some as a transition zone against vibration issues. That many coils suggests the tube was much longer than needed so why not keep coiling.
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