DIY Fuel tank
- ROBBIE
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Re: DIY Fuel tank
Few weeks back I struggled to follow Steve up over a hill with quarter of a tank
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Jimny 1.6 not as good as an SJ but still good
- Jordi
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Re: DIY Fuel tank
Don't ever intend it to be that empty when I'm off roading. May make it quite deep to prevent running it too low. Just loads of ideas being thrown around at the moment.
1988 Samurai - Truck Cab & Tray Back - 1.6 8v & HIF44 - Snorkel - Stack Exhaust - PAS, YJs & 33s - Trussed, Gusseted & Pumpkin Capped Axles - 4.3 R&Ps - 4.16 T/Box - Rear Air Locker - Full Float Back Axle & Discs - RCV Front Shafts - X-Eng Handbrake - Custom Fuel Tank
- Edweird
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Re: DIY Fuel tank
We had a similar issue with the Formula Student car's fuel tank, although it was due to cornering forces rather than incline angles. As the fuel system was my responsibility, I countered it by having a swirl pot type thing on the bottom of the tank, rather than having an actual swirl pot and a lift pump in order to save weight.
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Last edited by Edweird on Mon Feb 03, 2014 11:11 pm, edited 1 time in total.
There's three ways of doing things:
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And my way, which is like the wrong way but faster.
The right way,
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And my way, which is like the wrong way but faster.
- Ladaman
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Re: DIY Fuel tank
That's a nice idea Edwierd.
If you made the hole from the main tank to the lower swirl pot type tank not too small it would stop the fuel running away on hills.
And if you put the fuel out, maybe 25mm from the base, instead of at the lowest point, then you wouldn't suck crap out of the tank all the time.
If you made the hole from the main tank to the lower swirl pot type tank not too small it would stop the fuel running away on hills.
And if you put the fuel out, maybe 25mm from the base, instead of at the lowest point, then you wouldn't suck crap out of the tank all the time.
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Ignis Sport 1.5 16V; Jimny gearbox, 410 transfer box; 5.125:1 Vitara diffs; rear Lockright, Rob Storr full float rear axle, rear discs, YJ springs, virtual lift, 31" Grizzly Claws, beadlock rims, +50mm LR arches, LED rear lights, LED roof spots, bucket seats, Luke harnesses, internal cage
Ignis Sport 1.5 16V; Jimny gearbox, 410 transfer box; 5.125:1 Vitara diffs; rear Lockright, Rob Storr full float rear axle, rear discs, YJ springs, virtual lift, 31" Grizzly Claws, beadlock rims, +50mm LR arches, LED rear lights, LED roof spots, bucket seats, Luke harnesses, internal cage
Re: DIY Fuel tank
All depends how much of an angle you are at and for how long. A V shaped bottom won't really help if you are close to 45* and even with baffles the fuel can still drain to one side of the tank, just takes a bit longer.
What ed posted up is pretty much the best solution I think, it's the sort of thing I was going to do, personally I would rather have a tank with close to stock capacity to save carrying around loads of extra fuel/weight that you might not necessarily need for a day out offroading.
What ed posted up is pretty much the best solution I think, it's the sort of thing I was going to do, personally I would rather have a tank with close to stock capacity to save carrying around loads of extra fuel/weight that you might not necessarily need for a day out offroading.
- Edweird
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Re: DIY Fuel tank
The diagram I made isn't entirely accurate. The take-off point was actually about 10mm up from the bottom and protruded inside the 'swirl pot' about 10mm too. The reason I put the lip there was for precisely that, to help keep fuel from coming back out of the pot. I found that, after some fluid simulations and calculations, this method with the dimensions of the one we built (in theory, though it never let us down) works better than baffles and equally as well as a separate swirl pot, up until the vehicle reaches I think 3G perpendicular to gravity, which would equate to a vehicle tilt angle of about 70 degrees. If you can get your SJ over that far I think fuel delivery is going to be the least of your problems.Ladaman wrote:That's a nice idea Edwierd.
If you made the hole from the main tank to the lower swirl pot type tank not too small it would stop the fuel running away on hills.
And if you put the fuel out, maybe 25mm from the base, instead of at the lowest point, then you wouldn't suck crap out of the tank all the time.
The taller and skinnier you make the swirl pot, as well as the smaller the drain aperture, in the bottom of a tank like this the more extreme the angle, or cornering G you can pull without the pump sucking air.
There's three ways of doing things:
The right way,
The wrong way
And my way, which is like the wrong way but faster.
The right way,
The wrong way
And my way, which is like the wrong way but faster.
- twiss
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Re: DIY Fuel tank
Looks like a good idea! You could probably incorporate a sensor for the fuel light quite easily... as in if there is no fuel above the swirl pot you need to fill it up quick
Twiss
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'93 Maruti Gypsy MG410
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'93 Suzuki Samurai Sport 1.6 16v SU. Virtual lift, spring under, 31s
'93 Maruti Gypsy MG410
"If brute force doesn't fix your problem, you aren't using enough of it."
- Jordi
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Re: DIY Fuel tank
Petrol only has an SG of 0.737 so an extra few litres isn't going to exactly weight it down or affect performance.
1988 Samurai - Truck Cab & Tray Back - 1.6 8v & HIF44 - Snorkel - Stack Exhaust - PAS, YJs & 33s - Trussed, Gusseted & Pumpkin Capped Axles - 4.3 R&Ps - 4.16 T/Box - Rear Air Locker - Full Float Back Axle & Discs - RCV Front Shafts - X-Eng Handbrake - Custom Fuel Tank
- Edweird
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Re: DIY Fuel tank
Yeah, you could weld a bolt onto at the bottom of a side on the main tank over a hole and get a sensor that just threads in. I'd put it at a height so you'd have about a gallon left on flat ground.twiss wrote:Looks like a good idea! You could probably incorporate a sensor for the fuel light quite easily... as in if there is no fuel above the swirl pot you need to fill it up quick
There's three ways of doing things:
The right way,
The wrong way
And my way, which is like the wrong way but faster.
The right way,
The wrong way
And my way, which is like the wrong way but faster.
- dazerede
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Re: DIY Fuel tank
On the Sj I'm breaking it had a big metal jerrry can with 3 3mm holes and a bit of metal pipe coming out and then the fuel pipe clamped on good setup for a off-roader I think also had a metal frame to hold it in there only pic I had
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Suzuki Sj 410 Jap Built
Recaro Seats Fitted
Landini Blue Colour
Full rollcage and winch bumper
1.6 8v vitara lump with su carb
4” calmini lift kit
235/75/15 insa turbo special tracks
99.9% Rust Free
BUILT NOT BOUGHT
Recaro Seats Fitted
Landini Blue Colour
Full rollcage and winch bumper
1.6 8v vitara lump with su carb
4” calmini lift kit
235/75/15 insa turbo special tracks
99.9% Rust Free
BUILT NOT BOUGHT