Fuel line routing question?

« **on:** March 21, 2020, 09:48:35 AM »

-10an from tanks to pump, then from pump to regulator is -10an or -8an? Why are most electric pumps 3/8? Can someone please post pics of let me know what size hose to run. For a 540ci motor in a 18jet
Thanks

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« **Reply #1 on:** March 21, 2020, 04:09:25 PM »

-10an I believe is 3/8 Id. All the way to the carb I would think to be sufficient. That depends on what cfm carb , manifold combo you are using (dual top tunnel ram)
Also there are mechanical pumps capable of feeding a a 540 too

« **Reply #2 on:** March 21, 2020, 05:08:37 PM »

-6 or -an8 is 3/8s an 10 and 12 is usually for oil lines , if i remember. there is a chart you just have to google it.

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« **Reply #3 on:** March 22, 2020, 06:51:31 AM »

I am only running a 3/8 fuel line from a mechanical pump for 555 in a jet boat. I ran the same motor in my 30ft offshore boat with no issues and it ran 3/8 from the fuel tank. This is just my mock up

« **Reply #4 on:** March 22, 2020, 07:58:44 AM »

Thanks

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« **Reply #5 on:** March 22, 2020, 11:36:13 AM »

Which regulator should I run?

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« **Reply #6 on:** March 23, 2020, 03:35:11 PM »

Some mechanical pumps are preset to 7.5#
I have a holley 130gph keeps the bowls full and no sign of lean condition

« **Reply #7 on:** March 23, 2020, 03:42:54 PM »

Is your 130gph mechanical pump or electric?

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« **Reply #8 on:** March 23, 2020, 03:52:17 PM »

So what would you guys recommend, -8 an from tanks to carb or -10 an from tanks to pump, then -8 an from pump to carb? Or dose it not make a difference?

Thanks

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« **Reply #9 on:** March 23, 2020, 05:49:42 PM »

I have -6 (3/8ths) size hose and fittings from each tank to fuel pump to regulator to carb. 496 bbc. Zero issues. I run a Clay Smith fuel mechanical pump. Regulated down to 7 psi

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« **Reply #10 on:** March 23, 2020, 05:50:48 PM »

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« **Reply #11 on:** March 23, 2020, 08:12:05 PM »

I run -8 from the tanks to the pump to the carb on a 598 with a 1250 with a mechanical pump and no regulator

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« **Reply #12 on:** March 26, 2020, 08:47:24 PM »

Quote from: eliminator18 on March 23, 2020, 03:42:54 PM

Is your 130gph mechanical pump or electric?

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