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Old 06-04-2008, 09:44 AM   #1
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Default Fuel line length for 1/8 and 1/10 GP cars

Hello people,

I want to know the length of fuel line you guys are running in 1/8 and 1/10 GP cars. Do you people also use a fuel filter in between ?

I have fuel starvation problem in the past with my MRX4-R. I cannot use a fuel filter and fuel line length greater than 10cm ( 3 inches ). I have to keep the fuel line very short, and voila..... suddenly my engine can run perfect. But, one time I loss a brand new p/s/r due to particles entering into combustion chamber.

Thanks.
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Old 06-04-2008, 09:53 AM   #2
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The gas tank has a built in filter, so you don't need to use one. For the fuel line, just use enough to get from the gas tank to the carburator, you don't need any extra. For the pressure line from the pipe to gas tank, use a pressure chamber (by mugen) between the two pieces of line.

As for your fuel starving problem, if it continues after you change the fuel lines then your carburator needs adjustment.
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Old 06-04-2008, 10:13 AM   #3
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Quote:
Originally Posted by 00VIP001 View Post
The gas tank has a built in filter, so you don't need to use one. For the fuel line, just use enough to get from the gas tank to the carburator, you don't need any extra. For the pressure line from the pipe to gas tank, use a pressure chamber (by mugen) between the two pieces of line.

As for your fuel starving problem, if it continues after you change the fuel lines then your carburator needs adjustment.
What does the pressure chamber do anyways?. i have them installed on sedan and my 1/8th scale?.
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Old 06-04-2008, 11:06 AM   #4
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What does the pressure chamber do anyways?. i have them installed on sedan and my 1/8th scale?.

I calms the violent pressure changes coming for the pipe. It's the same thing as using a longer piece of fuel tubing from pipe to tank. It also can give better midrange response due to the decrease in tank pressure a mid throttle.
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Old 06-04-2008, 11:15 AM   #5
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Originally Posted by asw7576 View Post
Hello people,

I want to know the length of fuel line you guys are running in 1/8 and 1/10 GP cars. Do you people also use a fuel filter in between ?

I have fuel starvation problem in the past with my MRX4-R. I cannot use a fuel filter and fuel line length greater than 10cm ( 3 inches ). I have to keep the fuel line very short, and voila..... suddenly my engine can run perfect. But, one time I loss a brand new p/s/r due to particles entering into combustion chamber.

Thanks.

Not sure what you mean by fuel starvation. If your engine runs too lean when you use a longer piece of fuel line I would look for a leaky fuel tank (up high). Also how long is your pressure line. I've had problems in the past if the pressure line is too short to much air enters my tank which cause my fuel to froth real bad. This added air mixed with my fuel caused my engine to run really lean from 1/2 tank to empty.

Good luck. Pass you soon...
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Old 06-04-2008, 11:20 AM   #6
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Use of the chamber keeps pressure up to the same level as pressure line of the same length. Longer line drops pressure. Both dampen out the pulses. Chamber good.
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Old 06-04-2008, 11:24 AM   #7
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Use of the chamber keeps pressure up to the same level as pressure line of the same length. Longer line drops pressure. Both dampen out the pulses. Chamber good.
Hey Duneland,
That LS1 really sucks; it off to get modified.

Pass you soon...
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Old 06-04-2008, 12:34 PM   #8
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Thought you would get that result! I might remove a bunch of metal from the inside of mine and give it another go. It's going to require MAJOR mods to be competetive.
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Old 06-04-2008, 01:42 PM   #9
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Mods.......

A simple balloon can replace the Team Orion Constant Pressure Device....
Attached Thumbnails
Fuel line length for 1/8 and 1/10 GP cars-balloon.jpg  
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Old 06-04-2008, 05:00 PM   #10
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Originally Posted by asw7576 View Post
Hello people,

I want to know the length of fuel line you guys are running in 1/8 and 1/10 GP cars. Do you people also use a fuel filter in between ?

I have fuel starvation problem in the past with my MRX4-R. I cannot use a fuel filter and fuel line length greater than 10cm ( 3 inches ). I have to keep the fuel line very short, and voila..... suddenly my engine can run perfect. But, one time I loss a brand new p/s/r due to particles entering into combustion chamber.

Thanks.
Asw I thought I was doing something wrong when I added the Mugen pressure chamber the engine seems to run lean, and this happened on every time I tried the chamber with new and old lines eventually I took it off and voila engine perfect just as you experienced, now the pressure chamber just sits there

Guys should I richen up when added a pressure chamber ??
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Old 06-07-2008, 03:54 PM   #11
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Originally Posted by jelayne View Post
Asw I thought I was doing something wrong when I added the Mugen pressure chamber the engine seems to run lean, and this happened on every time I tried the chamber with new and old lines eventually I took it off and voila engine perfect just as you experienced, now the pressure chamber just sits there

Guys should I richen up when added a pressure chamber ??
Yes, I guess so.

Make sure the pressure chamber is air tight and sealed correctly, otherwise it has less pressure going into the tank, or worse a pressure leak.

Mine is sitting in drawer too.
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Old 06-07-2008, 03:55 PM   #12
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What fuel length do you people use ?
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Old 06-07-2008, 04:41 PM   #13
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I have never had a problem with the Mugen pressure chamber. Never had to richen to use it. Run the min fuel line length and the min pressure line length.
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Old 06-07-2008, 05:59 PM   #14
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I've always used a short as possible pressure line, since i had some oil clogs many years ago when using long lines which messed up the engine tuning..
fuel line can be a little longer if i really need the runtime.
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Old 06-13-2008, 09:02 AM   #15
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Quote:
Originally Posted by Roelof View Post
Mods.......

A simple balloon can replace the Team Orion Constant Pressure Device....
Interesting mod.

Does it inflate when you give a full throttle ?
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