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ProjectOffline
22 Post subject: Fuel Tanks  PostPosted: Jan 11, 2016 - 01:32 AM
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Hi guys

I was wondering if you would be able to give me some input

im building a diablo roadster and im looking to place dual fuel tanks im placing a bmw v12 750il

my question is where would be best place to place them and also if would go with similar fuel tanks as ford GT 40 " long" along the chassis and what is the best way to ensure the both tanks have equal fuel inside of them.

What type of fuel tanks did you place ?

Looking forward to any ideas and your thoughts thank you
 
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AdrianBurtonOffline
Post subject: RE: Fuel Tanks  PostPosted: Jan 11, 2016 - 06:36 AM
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Are you using a donor or tube chassis?

The typical placement is next to the engine


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jdinnerOffline
Post subject: RE: Fuel Tanks  PostPosted: Jan 11, 2016 - 11:02 AM
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You can see my fuel tank at the 29second mark here:
https://www.youtube.com/watch?v=wBNsFCQhXH0

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Post subject: RE: Fuel Tanks  PostPosted: Jan 11, 2016 - 10:14 PM
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JDinner !!

Thank you so so much for your reply , you are like God / legend when it comes to building these cars , your posts and everything you have done have help me and others so so much!!

My car is getting build on a tube chassis and i was not aware those type of fuel thank would fit next to bmw engine now that is something to think about now Smile

Just wondering have you used original bmw v12 fuel pumps ?


Again thank you.
 
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jdinnerOffline
Post subject: RE: Fuel Tanks  PostPosted: Jan 13, 2016 - 11:09 AM
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The original fuel pumps need two to run the engine, they are huge and submersible.
I simply took a MSD 2225 fuel pump and mounted it outside the tank. You can see it at the 30 second mark of the video above.
I tee'd the outlet to run both fuel rails...no problems.

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Post subject: RE: Fuel Tanks  PostPosted: Jan 13, 2016 - 01:45 PM
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Here are some pictures of how we mocked up the tank.
http://www.lambobuilder.com/edb/Chassis/GasTank/index.htm

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AdrianBurtonOffline
Post subject: RE: Fuel Tanks  PostPosted: Jan 13, 2016 - 03:42 PM
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I am using twin Bosch 044's because I am eventually planning to turbo mine once I get a better feel for the trans

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Post subject: RE: Fuel Tanks  PostPosted: Jan 13, 2016 - 10:00 PM
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Thank you guys for that it, helps allot.

Is there a reason you guys are not having dual fuel tanks on both sides ? i thought due to the weight would be better to have them placed on both sides and then connect them to keep the same level of fuel, for stability while cornering.

Would be there any benefits on adding duel fuel tanks considering i won't be racing with the car?

Also would you consider using Fuel Tank Foam?
 
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Post subject:   PostPosted: Jan 14, 2016 - 02:10 AM
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I don't want to barge into someone's post but I have dual fuel tanks on my build and want to add a few points that you may or may not have considered about using dual tanks.
1. I connected the two tanks (one on each side) with a 1 1/4" pipe across the bottom and installed a pipe plug at the bottom of that pipe (the lowest point in the system) to drain the fuel if needed. The large diameter is so the fuel will rapidly flow to both tanks as you fill from one side and won't cause the pump to stop repeatedly as you attempt to fill both tanks. A small fuel line between the tanks will only allow a small trickle of fuel to move into the second tank and take forever to get a complete fill.
2. You must run a vent line out of the top of the second tank into the top of the first tank (the one with the fill pipe for the gas hose from the pump) so the fuel can fill the tank and not have captive air above the fuel.
3. Run a vent hose out of the first tank into the fill pipe to allow the escaping air to trip the pump nozzle shutoff.
4. I installed the fuel pump and fuel level indicator in one tank but the choice is yours.

I hope these tips will help.

BTW, I used dual tanks because I didn't have enough space in one location to have a tank with a decent capacity. Each of my tanks hold 12.5 gallons.

RT

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Post subject:   PostPosted: Jan 14, 2016 - 02:48 AM
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That is some great info RT !

Thank you so much !

that helps allot! i believe i will go then with dual tanks if i manage to get them for a good price and follow your tips RT
 
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Post subject:   PostPosted: Jan 14, 2016 - 10:34 AM
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On my car the opposite side of the fuel tank I have the remote oil filter, battery, engine oil cooler and an electrical panel with relays for the fans. I just don't have room for another tank.

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Post subject:   PostPosted: Jan 14, 2016 - 09:22 PM
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you have to also be mindful that fuel will transfer between thanks so you WILL need to baffle the tanks (crossover tube), if you want it to be automaitc, otherwise you run the risk of upsetting you chassis in turns. This is why the racers that use dual tanks use lift pumps to fill a swirl pot to feed a pump that supplies the engine with fuel. It can get complicated but not insurmountable

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Post subject:   PostPosted: Jan 15, 2016 - 12:35 AM
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thank you all for information

AdrianBurton thank you for that it makes perfect sense ( double facepalm) especially having baffles inside of the fuel tanks i really didn't even think about that, i would need to make sure my one have them.

Also AdrianBurton do you also mean that you can have baffles in crossover tube only and it would work fine (should i place the foam inside of the tanks?) and if so would you know where i could buy crossover pipe with baffle inside of it ?

Hey RT just wondering did you place baffles in your fuel tanks? or how did you manage to deal with this issue?

You are right about that JDinner with the v12 engine unfortunately its not enough room for two tanks the way you had your set up i was thinking of same thing, however i managed to get some long angle shaped fuel tanks around 35 L each that would fit and im going to be transferring the battery to the front of the car ( i believe you placed it on that side to keep the weight balanced from across the fuel tank? correct me if i am wrong)

Ps ive read allot of posts to educate my self and get more information and understanding and now when im building the car only now i can understand when i read on this forum referring to 3% ..... only 3% of people who started the build actually finished it.
 
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Post subject:   PostPosted: Jan 15, 2016 - 02:15 AM
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Quick Update so i was wrong the fuel tanks they do have baffles so that was a good thing thank you for letting me know about that
 
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Post subject:   PostPosted: Jan 15, 2016 - 04:14 AM
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I did have baffles built into my tanks but let's get serious. I am not going racing with high centrifugal forces acting on my fuel as I race around sharp corners and risk starving my fuel pump. Sometimes things can be over thought to the point of ridiculous. My tanks are only 12.5 gallons each and are maybe 10" high by 10" wide. There isn't going to any serious issue with fuel during normal driving, which is what I will be doing.
It is always good to think and investigate what you are doing with your build but be realistic too.

RT

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