To Much Fuel Line?

[Shanty]

Hey,

I was wondering if there is actually a point where you can have to much fuel line? Realistically though, I am not going to have 5 feet of fuel line going to my motor. But is there a point where you can actually do damage to something or have loss of power?

Thanks
Shawn Stevenson

 

[MTBikerTim]

I would think that if you did have too much fuel line you wouldn't get the right amount of fuel being pushed into the engine. Too much resistance. This could cause tuning issues.

 

[whipnet]

I extended mine to help with the HTL problem and longer upside down run times, but there obviously is a limit. Test it out and let us know.

*

 

[MTBikerTim]

I find that my upside down runtime is fine even with a very short line to the carb. I find the trick is to not rev the engine while the truck is upside down as it uses a lot more fuel if you do.

 

[Larsenracing]

I don't know. Pressure is pressure it doesnt matter how large of hole its going threw. I have seen guys with T-Maxx's have coils and coils of fuel tube on them. I would think there is a limit somewhere but I would bet you could put alot on it. It would probably start to look hidious before affecting tune/power.

 

[k0m0d067]

Pressure is pressure it doesnt matter how large of hole its going threw.

not true at all bud...here's a perfect analogy/example...

take a garden hose, and cut it to 3 feet...fill it with water...now blow it out...

now try the same thing with say a 25 foot garden hose...totally different story...

takes alot more pressure to move a 25 foot hose full of water...technically, you are applying the same amount of pressure, but that pressure has to move ALOT more mass...

I would have to say that eventually there would be a point where you'd stop gaining any advantages, and start noticing negative effects...

 

[Larsenracing]

Yup but your still getting the same about of water out the end. Air in the line makes a difference as well. But taken that they both have the same percentage of air per foot with the same pressure in a 25' hose or a 3' hose you will still get the same GPM.

Try it Hook a 3' hose to your spicket then fill a 1gal bucket then take a 50' hose and fill a bucket, using a stop watch for both they will fill in the same time as long as you are filling with the same spicket.

 

[k0m0d067]

not quite the point I was making though...the pressure required to push the 50' of water thru the longer hose is much greater than the pressure required to push the 3 feet of water...

you will only get the same GPM with the garden hose set-up because the pressure is great enough that the hose length doesn't limit the GPM...

the back-pressure created by the exhaust would limit the length of hose you could run (although I doubt anyone would ever run that much hose in any case)

 

[windjammr]

u know there is suction as well as pressure,i think that by the time you got to volume being a prob it would take a bunch o fuel line,in racing ur limited to a set length so u don't have an advantage on fuel comsumtion

 

[Shanty]

Do you guys think it would be safe to run say 2 feet of fuel to the carb. Or is that to much?

 

[ZxIRAX]

I tried using around 14" of fuel line with an inline fuel filter after 7", and had some trouble getting my savvy to start and run. Maybe it needed to be re-tuned to accomodate the lesser pressure to the carb? I wanted to play so I took the fuel line and filter off and replaced it with an 8" piece of fuel pipe, started up and ran fine again.

What is your reason for wanting 2 feet of fuel tubing in the first place? even with the fuel tank relocation to the radio box, it shouldn't require that much? or are you wanting to have your savvy attached to a gallon of nitro fuel via a 100m fuel tube with an air compressor so you never run our of fuel.. haha =)

 

[savagechiken]

I think I may have run into a problem of having too short a line, like 6 inches with inline filter, basically as short as you can go. Can your fuel line be too short?

 

[ZxIRAX]

HPI reccomend 230mm for both the pressure and fuel tubes. Not sure if a snorter tube would cause any problems bacuse I can't see how you could get it much less than 180mm! my pressure tube used to be really tight, it was actually taught when pushed on to the fuel tank lis and the exhaust (never had any problems). I did however use one of the fuel tanks with the primer and had problems with this, couldn't rev past half throttle without it cutting out, there was loss of pressure somewhere. I just swapped it back for a stock tank and worked fine again.

 

[SDMorris]

I think with the suction these motors make combined with the exhaust back-pressure, it would take a LOT of fuel line for you to start seeing problems.

 

[whipnet]

I have 18 inches from the tank to the carb.

*

 

[Shanty]

I tried using around 14" of fuel line with an inline fuel filter after 7", and had some trouble getting my savvy to start and run. Maybe it needed to be re-tuned to accomodate the lesser pressure to the carb? I wanted to play so I took the fuel line and filter off and replaced it with an 8" piece of fuel pipe, started up and ran fine again.

What is your reason for wanting 2 feet of fuel tubing in the first place? even with the fuel tank relocation to the radio box, it shouldn't require that much? or are you wanting to have your savvy attached to a gallon of nitro fuel via a 100m fuel tube with an air compressor so you never run our of fuel.. haha =)

LOL ya I should think about doing that. But the real reason I am wondering is because I am thinking I am going to do the Mugen Mid Tank mod pretty soon. And was wondering if I can get the extra 10cc of fuel that you lose through this mod through having longer fuel line.

 

[chrisw]

i run around 2 feet of line and tied it to the shock tower and don't have any problems

 

[SDMorris]

Well I usually run myself 1.5 to 2 feet of line and never have had any problems, I also run several fuel filters which also adds to run time greatly.