[Alberg30] Diesel Fuel-line dimensions

Voyager Toronto voyagertoronto at hotmail.com
Sun Aug 10 18:31:21 PDT 2003


Thanks to all who responded.
Calvin, Voyager #30

>From: "RC Alley" <ralley at chesapeake.net>
>Reply-To: Alberg 30 public list <public-list at alberg30.org>
>To: "Alberg 30 public list" <public-list at alberg30.org>
>Subject: Re: [Alberg30] Diesel Fuel-line dimensions
>Date: Thu, 7 Aug 2003 23:36:27 -0400
>
>I don't know what the fuel requirements are for your engine, but it should
>be fairly simple to calculate your return requirements by subtracting the
>fuel burned at max RPM from the lift pump capacity (which may be constant,
>regardless of RPM)  The difference is what is returned to your tank,
>typically several gallons per hour--which is why clean filters are 
>critical.
>The capacity of the return hose needs to be near or in excess of the return
>measured in units of volume over time at the pump's rated pressure. Sounds
>complicated but it isn't.
>Mike's ballpark figures sound reasonable, depending on the volume of fuel
>delivered by the lift pump.  A half gallon an hour usage at max RPM may be
>high, depending on your engine. Always use maximum figures--max pressure,
>max volume, max RPM.
>Rob Alley
>----- Original Message -----
>From: "Voyager Toronto" <voyagertoronto at hotmail.com>
>To: <public-list at alberg30.org>
>Sent: Thursday, August 07, 2003 2:31 PM
>Subject: Re: [Alberg30] Diesel Fuel-line dimensions
>
>
> > Thanks, Mike. I already have the barbs so I'll go with the mixed sizes.
> > Calvin, Voyager#30.
> >
> >
> > >From: "Mike Lehman" <sail_505 at hotmail.com>
> > >Reply-To: Alberg 30 public list <public-list at alberg30.org>
> > >To: public-list at alberg30.org
> > >Subject: Re: [Alberg30] Diesel Fuel-line dimensions
> > >Date: Thu, 07 Aug 2003 13:44:55 -0400
> > >
> > >I don't think it matters if the lines are different size. Your smaller
> > >(1/4") return will not be carrying the same volume of fuel that you
>supply
> > >(3/8") line will becuase some of the fuel will be burned. Also I think
>that
> > >1/4" is sufficient even on the supply side because the volume of fuel
>isn't
> > >that great. I don't know how much gets delivered, but consider you are
> > >burning 1/2 - 3/4 gallons per hour and assume you are returning an 
>equal
> > >amont to the tank, then imagine that volume flowing through a 1/4" 
>hose.
> > >
> > >
> > >
> > >Mike Lehman
> > >"Gilleleje" #505
> > >
> > >
> > >
> > >
> > >
> > >----Original Message Follows----
> > >From: "Voyager Toronto" <voyagertoronto at hotmail.com>
> > >Reply-To: Alberg 30 public list <public-list at alberg30.org>
> > >To: public-list at alberg30.org
> > >Subject: [Alberg30] Diesel Fuel-line dimensions
> > >Date: Thu, 07 Aug 2003 16:27:03 +0000
> > >
> > >I am installing a new Tempo gas tank. The fuel inlet and return on the
> > >ENGINE are both 0.33". The nearest hose bards I can get are 3/8" which 
>I
> > >can attach to the supply side (fuel-takeoff at the gas tank and the 2
>ports
> > >on the inline fuel filter), but the gas tank comes with a 1/4"
>unremovable
> > >fuel return barb. Will it matter if I make the return side 1/4" and the
> > >supply side 3/8". If there is a reason all lines need to be the same
> > >dimension, do I go 3/8" or 1/4"? [Optional question for bonus points:
>why?]
> > >
> > >Calvin, Voyager#30
> > >
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