SuzukiSavage.com - Fuel line size?

Mattdw Full Member Offline Posts: 193 Frisco, TX Gender:	Fuel line size? 09/17/09 at 11:36:13 Trying to find out the fuel line size...tore it while disconnecting it from the carb...should I be able to pick it up at AutoZone, etc? What are the dimensions I would need to give them?
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justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: Fuel line size? Reply #1 - 09/17/09 at 11:44:40 Carry the old one in.Any parts house..
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Mattdw Full Member Offline Posts: 193 Frisco, TX Gender:	Re: Fuel line size? Reply #2 - 09/17/09 at 11:45:45 justin_o_guy2 wrote on 09/17/09 at 11:44:40: Carry the old one in.Any parts house.. Wanted to get it tonight on the way home from work...forgot to bring in the broken line
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justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: Fuel line size? Reply #3 - 09/17/09 at 11:49:21 I want to say it 1/4 " ID, but that stuff is cheap enough, so, get a foot of 1/4 & a foot of 3/16ths, if you are afraid of missing it. Maybe someone will chime in b4 you get ioff work,
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jabman Senior Member Offline Posts: 411 England Gender:	Re: Fuel line size? Reply #4 - 09/17/09 at 11:59:16 the inside diameter is 8mm im getting a in-line fuel filter so i checked today
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Serowbot YaBB Moderator ModSquad Offline OK.... so what's the speed of dark? Posts: 28387 Tucson Az Gender:	Re: Fuel line size? Reply #5 - 09/17/09 at 12:01:51 Like jabman said,.... it's 8mm, equal to 5/16",.... I went and measured... You can force a 1/4" on, if you like wrestling... I mean really like wrestling!...
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justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: Fuel line size? Reply #6 - 09/17/09 at 17:54:17 A knife run around the inside to skin the first little back & make a funnel shape & a lighter to soften it a bit & some spit to lube it,, I bet I could do it..
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boofer Ex Member	Re: Fuel line size? Reply #7 - 09/17/09 at 20:25:13 Use 5/16 and good clamps. Gives good fuel flow.
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justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: Fuel line size? Reply #8 - 09/18/09 at 01:52:33 Of course, buy the right one, but if you ever have to crush one on & it doesnt want to go..then do those things & it becomes a bit less impossible.
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Mattdw Full Member Offline Posts: 193 Frisco, TX Gender:	Re: Fuel line size? Reply #9 - 09/18/09 at 07:04:00 Serowbot wrote on 09/17/09 at 12:01:51: Like jabman said,.... it's 8mm, equal to 5/16",.... I went and measured... You can force a 1/4" on, if you like wrestling... I mean really like wrestling!... THANKS all!
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doh13

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Re: Fuel line size?
Reply #10 - 05/27/14 at 10:33:48

I know I am resurrecting an old post but I wanted to add that my measurement of the original fuel line of my 99 savage was 7 mm across the inside diameter on both ends . The 7 mm measurement was likely due to the line shrinking back down to the "real" size after being off the carb for a couple of weeks. 8mm, 5/16 would work fine as well and in other posts by Oldfeller he even recommended 5/16 or 3/8 because it will slip on easier and have better flow if you want to add a filter for more info see http://suzukisavage.com/cgi-bin/YaBB.pl?num=1211846392..

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Dave

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Re: Fuel line size?
Reply #11 - 05/27/14 at 11:08:08

Definitely use 8mm or 5/16". Going down to a 1/4" doesn't sound like much restriction - but in a gravity system it is.
(5/16") squared x Pi = 0.3068 square inches
(1/4") squared x Pi = 0.1963 square inches

0.1963/0.3068 = 0.6398. So the 1/4" is only 64% of the flow area of the 5/16" hose.

If you were to calculate effects of the wetted perimeter vs. volume.....the 1/4" hose most likely will flow less than half the volume of the 5/16"fuel hose.

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justin_o_guy2

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Re: Fuel line size?
Reply #12 - 05/27/14 at 11:11:45

Take a piece of 1/2 schedule 40 PVC pipe, lay it flat for one mile,,hook it to a pump & nothing comes out,,it blows up at the pump,, no matter how slow, because the hydraulic restriction of flowin inside a pipe that long is just too great, you cant get a gallon an hour,, OR so some smarty pantsed guy told me when I was selling PVC.. & valves & all such stuff..

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doh13

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Re: Fuel line size?
Reply #13 - 05/27/14 at 12:59:35

Dave wrote on 05/27/14 at 11:08:08:

Definitely use 8mm or 5/16". Going down to a 1/4" doesn't sound like much restriction - but in a gravity system it is.
(5/16") squared x Pi = 0.3068 square inches
(1/4") squared x Pi = 0.1963 square inches

0.1963/0.3068 = 0.6398. So the 1/4" is only 64% of the flow area of the 5/16" hose.

If you were to calculate effects of the wetted perimeter vs. volume.....the 1/4" hose most likely will flow less than half the volume of the 5/16"fuel hose.

Good info i would be interested in knowing if anyone has actually had troubles with flow being inadequate with or without an added in line filter using the OEM fuel hose with a raptor petcock (free flowing) or is it just mainly a precaution to use a bigger fuel hose?

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Dave

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Re: Fuel line size?
Reply #14 - 05/27/14 at 13:07:24

doh13 wrote on 05/27/14 at 12:59:35:

Dave wrote on 05/27/14 at 11:08:08:

Definitely use 8mm or 5/16". Going down to a 1/4" doesn't sound like much restriction - but in a gravity system it is.
(5/16") squared x Pi = 0.3068 square inches
(1/4") squared x Pi = 0.1963 square inches

0.1963/0.3068 = 0.6398. So the 1/4" is only 64% of the flow area of the 5/16" hose.

If you were to calculate effects of the wetted perimeter vs. volume.....the 1/4" hose most likely will flow less than half the volume of the 5/16"fuel hose.

Good info i would be interested in knowing if anyone has actually had troubles with flow being inadequate with or without an added in line filter using the OEM fuel hose with a raptor petcock (free flowing) or is it just mainly a precaution to use a bigger fuel hose?

Yes, there have been issues with using 1/4" fuel line and an inline fuel filter. The 1/4' fittings have a much smaller hole....and they can "air lock" when a trapped air bubble cannot flow upward and block the fuel from flowing down. I will look and see if I can find the thread where that was discussed. I believe S-P was the latest victom of this air block when he installed an inline fuel filter....or maybe is was Gerry?

Dave

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