Vintage Grumble Posted January 26, 2017 Author Share Posted January 26, 2017 Hi there, i'm having a bit of a problem with this heinous pick up, so thought i'd run my ideas past you lot. Surprisingly Hilux fuel tanks don't seem to be built for decent acceleration, the tanks shaped like this: Its mounted in a north south configuration, and has absolutely no baffling, so with any decent acceleration all the fuel just heads south. I've found I have to have more than a 3rd of a tank of gas or it cuts out under boost. My options would be to either install a surge tank, which means I would have to buy another tank and fuel pump, OR make a drop box sort of thing and weld it to the bottom rear of the tank, for the current pump to live in, thus having a low point in the area the fuel would head too. I would prefer the drop box idea, as then I don't have to have another pump/more plumbing/more wiring and another tank. I'm just not sure what the rules are about modifying a fuel tank? Ideas and suggestions would be more than welcome. xoxox Quote Link to comment Share on other sites More sharing options...
AllTorque Posted January 26, 2017 Share Posted January 26, 2017 4 Quote Link to comment Share on other sites More sharing options...
bigfoot Posted January 26, 2017 Share Posted January 26, 2017 42 minutes ago, Vintage Grumble said: Hi there, i'm having a bit of a problem with this heinous pick up, so thought i'd run my ideas past you lot. Surprisingly Hilux fuel tanks don't seem to be built for decent acceleration, the tanks shaped like this: Its mounted in a north south configuration, and has absolutely no baffling, so with any decent acceleration all the fuel just heads south. I've found I have to have more than a 3rd of a tank of gas or it cuts out under boost. My options would be to either install a surge tank, which means I would have to buy another tank and fuel pump, OR make a drop box sort of thing and weld it to the bottom rear of the tank, for the current pump to live in, thus having a low point in the area the fuel would head too. I would prefer the drop box idea, as then I don't have to have another pump/more plumbing/more wiring and another tank. I'm just not sure what the rules are about modifying a fuel tank? Ideas and suggestions would be more than welcome. xoxox I have a surge tank in my hoard you can have for cheap. Has screw on things though Quote Link to comment Share on other sites More sharing options...
Raizer Posted January 26, 2017 Share Posted January 26, 2017 And I've got a new low pressure pick up pump to fill it... Quote Link to comment Share on other sites More sharing options...
HighLUX Posted January 26, 2017 Share Posted January 26, 2017 I have a fuel tank from an EFI hilux you can have for a box o beers. Has baffles and all that stz 1 Quote Link to comment Share on other sites More sharing options...
Vintage Grumble Posted January 26, 2017 Author Share Posted January 26, 2017 2 hours ago, AllTorque said: Someone else showed me them things, but they are rapeishly expensive I believe. Would be easy to install though, hmmmmmmmmmm. 1 hour ago, bigfoot said: I have a surge tank in my hoard you can have for cheap. Has screw on things though 1 hour ago, Raizer said: And I've got a new low pressure pick up pump to fill it... Thanx guyz, but i'm not real keen on the idea due to all the extra crap involved, want to keep things as simple as possible, hence leaning towards different pick up or pump location/sump spec box thing. 1 hour ago, HighLUX said: I have a fuel tank from an EFI hilux you can have for a box o beers. Has baffles and all that stz Interesting, I may have to come have a gork at this. where's the pump located in the factory ones? 1 Quote Link to comment Share on other sites More sharing options...
HighLUX Posted January 26, 2017 Share Posted January 26, 2017 Its off a 3RZ lux so intank pump with lil bowl and baffles. It bolted up to my lux so should go on yours too. Its a bit shit hence price but ballin on a budget is name of the game Quote Link to comment Share on other sites More sharing options...
datlow Posted January 27, 2017 Share Posted January 27, 2017 My old fuel cell just had heaps of black foam type stuff? No idea how good it is but easy & cheap google fuel tank foam baffle http://www.nzkw.com/nzkw-yellow-buffle-fuel-foam-p-838.html 1 Quote Link to comment Share on other sites More sharing options...
Vintage Grumble Posted January 27, 2017 Author Share Posted January 27, 2017 3 hours ago, HighLUX said: Its off a 3RZ lux so intank pump with lil bowl and baffles. It bolted up to my lux so should go on yours too. Its a bit shit hence price but ballin on a budget is name of the game Ha, whats wrong with it? Is it from fire lux? Interesting that it bolts up to old lux's. 2 hours ago, datlow said: My old fuel cell just had heaps of black foam type stuff? No idea how good it is but easy & cheap google fuel tank foam baffle http://www.nzkw.com/nzkw-yellow-buffle-fuel-foam-p-838.html That stuffs not so great in std tanks, fuel sender wont get along with it, plus the opening in the tank is only about 100mm round, so hard to jam a big brick of it in there. 1 Quote Link to comment Share on other sites More sharing options...
HighLUX Posted January 27, 2017 Share Posted January 27, 2017 Its from fire lux and has a dent or 2 Quote Link to comment Share on other sites More sharing options...
kpr Posted February 5, 2017 Share Posted February 5, 2017 the bowl i welded on the bottom of my hilux works all good. //oldschool.co.nz/index.php?/topic/44718-kprs-84-hilux/&do=findComment&comment=1410457 2 Quote Link to comment Share on other sites More sharing options...
Vintage Grumble Posted February 5, 2017 Author Share Posted February 5, 2017 Yes, I think I'll definitely go that way, seems to be the best all round solution. It wouldn't have to be very large or deep, as long as it's right at the back of the tank. Quote Link to comment Share on other sites More sharing options...
Popular Post Vintage Grumble Posted August 28, 2017 Author Popular Post Share Posted August 28, 2017 Well then, the having to have at least 1/2 a tank of gas, to stop surge under acceleration lark, finally pissed me off enough, that I pulled the tank out. I thought about all scenarios, and pretty much went with the easiest option I thought would work. I cut out a new flange, from 6mm thick steel, and welded it to the very back of the tank, Then I lengthened and bent the pump cradle, so it sits at the lowest point of the tank, and right at the back. Took a while to get this just right, so that it wasn't touching the bottom of the tank, but nice and close, while not touching the drain plug that's right behind it. Slapped a bit of paint on it, then slapped the cradle in, Then I cut out a blanking plate for the old hole, screwed that down, sealed it, and then slapped a coat of underseal on it for good measure, Put it all back together, slapped piss all gas in it, and whet for a hoon. With less than a 5th of a tank (Probably around sub 10L from bone dry) I could be as fully hektik as possible, and it never surged once, great success!!. Next on the list is to change the AFM, and the throttle housing, then go for a re-tune with more boosts. I also want to change the engine driven fan to electric, but am having trouble deciding on what sort of fan to go for. Regards, VG. 12 Quote Link to comment Share on other sites More sharing options...
mjrstar Posted August 28, 2017 Share Posted August 28, 2017 nice work, welding on the tank looks great, did you consider a couple of worm style hose clamps rather than your array of cable ties for pump mounting? Quote Link to comment Share on other sites More sharing options...
Vintage Grumble Posted August 28, 2017 Author Share Posted August 28, 2017 33 minutes ago, mjrstar said: nice work, welding on the tank looks great, did you consider a couple of worm style hose clamps rather than your array of cable ties for pump mounting? You know what, I didn't even think about hose clamps for that, haha. I have no idea how long the cable ties will last. The last ones have been in there for 2 years and were still fine, so assume gas doesn't bother them too much. While you're here, what sort of electric fans do you use on your creations? 1 Quote Link to comment Share on other sites More sharing options...
kicker Posted August 28, 2017 Share Posted August 28, 2017 The 2 speed fan from a 90's Volvo blow hard for what they are 3 Quote Link to comment Share on other sites More sharing options...
mjrstar Posted August 28, 2017 Share Posted August 28, 2017 Fan wise i have never done anything outrageous, i'm a fan (pun intended) of nailing the liquid side of the system be it upsized thermostat opening area as was the case with the MX5 or additional passes / baffle in the radiator like the starlet got. The POS racecivc got almost nothing other than the rubbish aftermarket fan which was cable tied to the core replaced with an OEM fan and a fine foam strip between the rad and shroud to prevent drawing air from anywhere but through the core. I believe if the wet side is top notch and you don't have a burnout only spec machine the fan should only be kicking in momentarily until you are back up to road speed. I had no fan on my evo for a couple of years and did track days with it with no issues, admittedly i have since put a fan on which comes on occasionally whilst in traffic. Long story short some OEM fan with a decent metal shroud you can easily modify is the type of fan i try to use unless space is at an absolute premium, aftermarket plastic case fans can GTFO. I wouldn't bother with 2 speed unless you are concerned with noise, although could always just run it on fast if it does in fact blow hard for what it is. 1 Quote Link to comment Share on other sites More sharing options...
kicker Posted August 28, 2017 Share Posted August 28, 2017 Yeah the 2 speed isn't necessary, I run mine on low only, just a name to identify the fan I meant 2 Quote Link to comment Share on other sites More sharing options...
Vintage Grumble Posted August 29, 2017 Author Share Posted August 29, 2017 To be fair, cooling is not a problem, it has the factory hilux radiator in it still, with the SR20's engine driven fan, and it never gets hot. The main reason for wanting to change is power gain, and i'm hoping it will warm up a little faster from cold. I have an electric fan from an AE101, but its a few inch's smaller than the standard SR fan, so think it may not be up to the job. Quote Link to comment Share on other sites More sharing options...
UTERUS Posted August 29, 2017 Share Posted August 29, 2017 Also there are some model of BMW (E36?) that had two speed fan. I remember grabbing a temp switch and loom from one at pick a part once. They turn low speed on at 80c and high at 88c. 1 Quote Link to comment Share on other sites More sharing options...
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