HMT surge tank
 

Well since my fuel sys is not as good as it could be, I decided to upgrade it a little bit. I got some .070" 6061-T6 aluminum and made a surge tank, that will be located in the battery tray. Then ill have my walbro 255lph still in the tank, pushing fuel to the surge tank, then from there the bottom fitting will go to a Aeromotive external fuel pump and then to the fuel rail. The return from the FPR will go back to the surge tank and if there is anything else that need to be returned to the tank will be done so by the third line on top.

Here are some picks.

http://memimage.cardomain.net/member...2_304_full.jpg
http://memimage.cardomain.net/member...2_305_full.jpg
http://memimage.cardomain.net/member...2_306_full.jpg

Re: HMT surge tank
 

looks nice , what are the advantages with a serge ive seen this on a lot of drift cars and road race cars. i would like to see more pics please

Re: HMT surge tank
 

it supouse to help eliminate fuel starvation, in high cornering, launching etc.

Re: HMT surge tank
 

Let us know how it works out

were you previously having a problem with this on your launches?

Re: HMT surge tank
 

Thank god my car is too slow to need that!

Re: HMT surge tank
 

lol. Werent you gonna go to a fuel cell 98CTR? That surgetank looks effin sweet man, props.

Re: HMT surge tank
 

that doesnt look too safe :-\ i know i would be ---- scared.. thats like driving arround with a bomb under your hood.. they put the gas tanks in the back for a reason :-\ fumes will build up.. and one day.. theres gonna be enough stress to make a small crack.. gas fumes.. ignite.. god damn... not gonna be cool..

take a 2 liter pepsi bottle.. put one teaspoon of gas in it. put the cap on. and shake it hard... take the cap off.. take a match.. and just put it on the opening.. look how far that thing flies... and how it melts the plastic....

Re: HMT surge tank
 

I was thinking about it, but its not allowed in my class, so I have to do with what I have and make it work. HMT u know. ;) lol


I don't think you understand the way it works. There is zero pressure in the surge tank, all the extra fumes and gas is routed back to the gas tank.

Re: HMT surge tank
 

Wouldn't a sump going to the Aeromotive eliminate the surge tank and the extra fuel pump? It looks nice though. Never seen anything like that before

Re: HMT surge tank
 

Sounds like something a terrorist would do!!!!

LOL :P

Re: HMT surge tank
 

It would, but right now I don't have the time or all the cash to do that. That would requrie me to drop the tank and braze a sump into the gas tank. And then run stainless steel braided lines all the way to the eng. bay. So this is going to be a temporary solution and next year im going to do the sump. The first race of the seazon is on Feb. 26 and my car is a dally driver and everything that I do, requires me to get it done in two days or less, that way I can get to work and back.

Re: HMT surge tank
 

I was contemplating the question of whether you could turn the fuel drain plug into a sump and get around doing all that welding and ----. Haven't seen anything about it before.

Also, with this setup, how are the flow rates keeping up with each other? I don't know what your fuel pumps flow, but have you figured out about how much gas will be going where, and how fast? With all these different things in the system, I would think it could be pretty easy to have one pump outflow the other or ones working way hard and doesn't need to or something.

Re: HMT surge tank
 

Well it's sitting where the battery used to be. Batteries are filled with poisonous acid that can eat the skin off your body. I don't see the difference. :l
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Re: HMT surge tank
 

well.. i figured baterries are made of hard plastic or whatever.. they can take stretching and what not.. but an aluminum welded tank.. i dont think those welds can take much abuse :l

my over flow tank in my car.. if u look where the mounting bracket hits the tabs.. the plastic is faded and turned white from all the stress off the cars driving.. and turns and what not..

i dont think the engine bay would be a safe place for the tank :l

i wasnt paying attention to what those returns were ;D but still a failed weld is a failed weld.. and weather it be gas fumes.. or just gas.. thats scary.. run it with water before you pump gas.

i also thought of that.. what if the fuel tank pump wasnt pushing enough and the surge tank tank was working too hard? im sure that would fry the surge tank pump too many factors involved :-\

why dont you just use a plastic tank? thats a hell of alot of a safer bet than steel.. do fuel cells made like that break? but then again i dont think fuel cells are put under the hood.. and stress under the hood of a car is alot higher... like when i put a baterry in the middle of my car and pulled a hard turn.. the baterry didnt move..

but if i had a baterry in the back of my car.. or under the hood not tied down.. that thing flies..

also.. engine bays are hot.. and that aluminum will prolly cause a build up of gas fumes.. even tho they go to the gas tank.. where does that build up all go? my 87 civic wagon.. everytime i pulled the gas cap off it would go pssssssssshhhh like ur opening a pepsi.. wouldnt that surge tank cause a dangerous fumes build up?

im more worried about this than you are :P

Re: HMT surge tank
 

It would not concern be to have the tank there.Minor vibrations etc are not going to break the welds.Looks like good by the way nice work.Are you hoping to dig deeper in the tens this year?Any other major changes you have made?

Re: HMT surge tank
 

its not going to break or blow the car up.....

Re: HMT surge tank
 

The only problem I see with using the drain plug as a feed would be dirt and water that goes down to the bottom of the tank.

And as for the pupms keeping up with each other, well I figured that the Walbro 255 was doing ok with being the only one in the system, so it should have no problem keeping the surge tank full. And the Aeromotive pump will only put out constant flow to the injectors and the FPR will route back any unused fuel to the surge tank that will also help keep it full at all times.

The only time I will have to make sure that its full, is when I first install it. And then all I have to do is prime the system a few times and that should take care of it.

As for some of the safety issues that some of you have showed concern, I think it will be ok with having the tank in place of the battery. Most of the surge tanks usually sit right above the fuel tank inside the car. So by not having it there I think that is even safer.

And if you think about it, all the race cars that I know, have their fuel cell in the engine bay next to the front tire.

Re: HMT surge tank
 

Yes, but how would a welded on sump be any different? That's why I thought of the drain plug.

Re: HMT surge tank
 

Arent the fittings from the sump, usually about 1/2" or so off the bottom ? That way it won't suck out all the dirt and water ?

Re: HMT surge tank
 

i thought they were on the very bottom. Doesnt really matter though, that is what your fuel filter is for

Re: HMT surge tank
 

a write up is necessary. :y


very sweet though 98ctr. Never seen something like that before. seen fuel cells up front, but not a surge tank.

Re: HMT surge tank
 

because the sump is the lowest and at the rear most part of the tank so during acceleration the gas move back towards the pickup. The drian plug isn't an ideal place for a pickup.


Surge tanks are a popular solution for people who convert from carbs to fuel injection.

Re: HMT surge tank
 

you sure about that Stephen? the idea of a surge tank would have there be no pressure, but in all the ---- i have seen you are suppost to feed the surge tank with a low pressure high flow fuel pump. your running it wiht a high pressure high flow pump... its ment to run at like 255lph @ 43psi with 14volts (not 100% sure, but close). so i thnk that that tank will be pressurzied...so the "extra" fuel that goes back to the tank will be pressurized a good amount im sure...

there is one on my GTI also, it runs a low pressure pump like 7psi to feed the tank and the high pressure pump...


i have thought about the size of the tank before, on a 15sec or so pull at like 400whp will take about a liter or so of gas... plus the back pump will be still feeding some gas, and the return will be going back into the tank..... i think Stephen;s tank is fine...

Re: HMT surge tank
 

thanks guys, as soon as I get everything done ill post some more pics. Im in the process of making another one for one of my friends. But its going to be a different design. ;)

Re: HMT surge tank
 

here are a couple more pics? got the O rings and all the fittings that I need.

http://memimage.cardomain.net/member...2_307_full.jpg
http://memimage.cardomain.net/member...2_308_full.jpg

Re: HMT surge tank
 

Looking pretty good. AC fillet welds aren't all that easy to do.

Re: HMT surge tank
 

yeah, welds look good. Oh yea, hope those are nitrile o rings