I need a bigger fuel tank

[yeeehah]

folks,

I'm currently in the process of setting up my evo 1 to run in endurance events, starting with the next Wakefield 300 in 12 months time. As a result I need a bigger fuel capacity, we think around 80Lt will do the trick. Now, there are many ways to do this, but I want a solution that is the safest and most efficient. I personally don't like adding extra tanks in with all the added fuel lines etc (its just more things to wrong), i also don't think a surge tank is needed, if you have a baffled tank. Currently, I'm just running a 255lt/ph walbro in tank pump in the standard tank.

I run 16psi of boost and making a little over 200kw at all wheels which is enough for the moment. I like the location of the original fuel tank, so what i would like to do is replace the current tank with a bigger capacity fuel cell and run the walbro intank pump. I might have to get a custom tank...

Has anyone got any thoughts on this?
How big can i go underneath is the question?

any ideas appreciated.

 

[DOUGMO]

At a guess you could get about 60-65 litres in the stock position with a custom tank. I have a half tank thats 25L.

I would definatley reccomend a surge tank though so that you can use every last drop.

 

[yeeehah]

hmm...,65 Lt would be good, then maybe i could run a 15Lt surge tank. The existing walbro could divert to the surge tank, (would that be overkill?)
then run an external pump from surge tank.

 

[DOUGMO]

this is my tank, approx 25 L

installed with the surge tank, its only 5 litres but it pokes up inside the car, lots of room on each side though

 

[yeeehah]

mad pics mate, thanks for sharing, that definitely gives me some ideas!
Under car setup is my preferred way also, i like this setup, obviously its for s14/15
http://www.nissansil...ic=405671&st=30

though i might be crammed for room, proly to need to think a little more on fuel pumps setup also.

 

[BMGTZ]

under the floor near spare tyre well on drivers side there is a fair bit of room.....have owned a car with a surge tank mounted there

 

[khubner1]

i would run a sealed of std tank then install a fuel cell in the boot feeding the std tank.

 

[rvrftw]

Since it is a race car, you don't need a spare wheel, so cut it out and put a fuel cell in its place.... I reckon you could fit a 30l fuel cell in there. Then weld some flat plate in the boot to stop any fumes getting in the car. Then you just run a pump from the cell to the normal tank.

That would get you 75l... If you needed more, just run a taller fuel cell into the boot.

 

[yeeehah]

Running a second tank in the boot and gravity feed to the standard tank was my original thought, but its not the safest. What if i get done in the rear (so to speak...)?:-(
I'd need to seal the boot anyway, coz the rules we're building to state the fuel system should be isolated from the cabin.

I'm really liking the idea of an under car main tank then feeding to a surge tank. The location is great for safety and overall handling of the car.

Dougmo is that the reason you decided to run the tank on passenger side or is it just that you had more room?

 

[khubner1]

i would think he put it on pass side to even out the weight of himself even if only for a short time. his setup looks to be for a short time attack/hill climb kind of event you could do similar to his with a fuel cell. i think alot of purpose built cells these days come as a double tank kind of thing one tank buyilt to carry your fuel then a second tank around that that contains a fire suppressing material. i'd go with rvr's idea cut spare wheel well out (cut it in such a shape so you can sell it to an awd conveter) weld a new section of floor and install a cell where the spare wheel would go.

 

[DOUGMO]

yep, on the lhs for weight balance. safety wise its better in front of the diff but in reality heaps of cars have rear mounted tanks.
having a gravity feed secondary tank inbetween the rear strut towers is very common in tarmac rally circles

 

[rvrftw]

That is why i said to weld a plate over where the spare wheel well was... So that way the fuel cell isn't "in the boot". Then you mount the fuel cell to the bottom of that plate.