SoCal Jet Boats

Tech Talk => Engine Mechanical / Electrical => Topic started by: eliminator18 on March 21, 2020, 09:48:35 AM

Title: Fuel line routing question?
Post by: eliminator18 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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Title: Re: Fuel line routing question?
Post by: bahner80 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

Title: Re: Fuel line routing question?
Post by: mobboss 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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Title: Re: Fuel line routing question?
Post by: Tahoe540 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

Title: Re: Fuel line routing question?
Post by: eliminator18 on March 22, 2020, 07:58:44 AM

Thanks


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Title: Re: Fuel line routing question?
Post by: eliminator18 on March 22, 2020, 11:36:13 AM

Which regulator should I run?


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Title: Re: Fuel line routing question?
Post by: bahner80 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

Title: Re: Fuel line routing question?
Post by: eliminator18 on March 23, 2020, 03:42:54 PM

Is your 130gph mechanical pump or electric?


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Title: Re: Fuel line routing question?
Post by: eliminator18 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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Title: Re: Fuel line routing question?
Post by: el mojado 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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Title: Re: Fuel line routing question?
Post by: eliminator18 on March 23, 2020, 05:50:48 PM

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Title: Re: Fuel line routing question?
Post by: K-034 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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Title: Re: Fuel line routing question?
Post by: bahner80 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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