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Fuel return line Question


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  #11  
Old 12-20-2018, 08:24:07 PM
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OTTO-Sawyer OTTO-Sawyer is offline
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Default Re: Fuel return line Question

And Right AFTER I posted That I realized the OP was referring to a Dump Truck and NOT Hit & Miss Engines. . .

So. . . in spite of my original reply not being in line with the original question, I would still say the Return line does NOT need to be larger than the feed line, as most old cars I ever worked had say a 3/8ths feed line and a Smaller 1/4 inch return line.

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  #12  
Old 12-21-2018, 02:44:20 PM
The Diesel Doctor The Diesel Doctor is offline
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Default Re: Fuel return line Question

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ID:	324855 On Detroits the heated fuel returns to the tank at 9/10 g/min. at operating speed. AL
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Old 12-21-2018, 03:03:54 PM
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Default Re: Fuel return line Question

Quote:
Originally Posted by OTTO-Sawyer View Post
And Right AFTER I posted That I realized the OP was referring to a Dump Truck and NOT Hit & Miss Engines. . .

So. . . in spite of my original reply not being in line with the original question, I would still say the Return line does NOT need to be larger than the feed line, as most old cars I ever worked had say a 3/8ths feed line and a Smaller 1/4 inch return line.

Cat mechanical 3406 uses -4 return line, -10 feed, Cummins Big cam uses -10 for feed -8 for return, so no it doesn't have to be bigger. I'd have to look on my 6-71's but I think they my be -6 or -8 with -10 on the draw side.
Kubota uses much smaller return, along the line of the Cat,but everything is smaller.
Leyland 680's used 3/8" both supply and return IIRC, Gardner 6LXB May have used 1/2" supply with 3/8 return IIRC Going back 30 or more years on my memory here
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Old 12-21-2018, 03:36:42 PM
The Diesel Doctor The Diesel Doctor is offline
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ID:	324859 From the data book. AL
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Old 12-21-2018, 07:59:25 PM
Beanscoot Beanscoot is offline
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Default Re: Fuel return line Question

I would agree the return line need not be larger than the supply line, except for those engines that have more fuel coming back than going out.
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