ED Civic EFI Conversion - FUEL tanks

THIS WILL NOT WORK WITH ED CIVIC HATCBACKS, THE FILLER HOLE IS IN A DIFFERENT POSITION, CAN BE MODIFIED TO WORK WITH A DIFFERENT HOSE THOUGH.

Been lurking the internet and this forum for a fair while trying to get information on ED civic EFI conversions.

There is a fair deal of information on line about this, but the information that I found was fairly murky..

So anyway I thought I would create a small quick thread with some of my first hand experience...

Most people have said that to the conversion you need to get a 2nd Gen CR-X Fuel tank, or retrofit a fuel pump into the provisioned template on the factory carby fuel tank, with both tanks running EFI rated hoses to the hardlines. (I think there are two members on here who have a pretty detailed fuel pump install in there build thread)
Other tanks such as concertos, EG, EK and integra fuel tanks have been mentioned by members to work but of course there were other members to say it didn't

Anyway, well for me I didn't feel to good of myself to cut into fuel tank and it was almost impossible to source a CRX Fuel tank.

But I had however, a wrecking EG & EK, my project ED and a donor parts car DA9.

So I dropped the EK, ED and DA9 tank's to compare....

http://a5.sphotos.ak.fbcdn.net/hphot...53348446_n.jpg

Here is the ED tank... you can see at the top right the provsion to where a fuel pump would be installed..
http://a8.sphotos.ak.fbcdn.net/hphot...31959269_n.jpg

and the EK Tank
http://a7.sphotos.ak.fbcdn.net/hphot...03440195_n.jpg

Under first impressions.. the EK tank looks to be the same shape and size. However the upper buldge is slightly thicker than the ED with the fuel pump also being positioned in the centre. This could possibly pinch onto the fuel lines when installed and starve the engine...

The mounting positions were also a bit off, but I'm sure with some fabrication work it COULD be made to fit...

Here is the DA9 tank, I will be using this one..
http://a4.sphotos.ak.fbcdn.net/hphot...31285154_n.jpg

And this is the DA9 tank. It is the same shape and dimension as the ED tank. You can also see that the fuel pump is located where a CR-X or EFI ED would have it positioned. The fuel sensor is also in the same position so it will be in the correct spot in regards to the fuel sensor hole in the cabin.

The DA9 tank however is a bit different with its contours and the buldge at the top of the image is also thicker than the ED one...

However dummy fitting the DA9 tank to the ED, the tank matched all mounting positions, and connected to all the factory lines but due to the slightly thicker buldge it sat about 2CM or less lower.

I don't think the fuel tank sitting slightly lower would be of a problem too me though, as I don't plan to be driving the car slammed.

I will get photos up of the DA9 tank installed soon...

Hope this helps some others looking to go EFI...

Good Post

thanks dude really good explain n save my time so much cheers~

Nice work

NO way!

did you just... solve the EFI problem?

sensational

Thanks for the positive replies guys.

Thought it would help out some people and stop the countless question/threads about this topic.

Hopefully see some more ED builds now too!

BOOM!! Head shot! Good work Tim

have you installed the tank yet? what else do you have to install for the EFI conversion?

Hey,

I've installed the tank now and ran new EFI rated hose from the tank to the hardlines.

I haven't done anything with the electrical wiring yet though, as I am waiting on oldschool and the boys to come around.

As soon as that's done I will put more info in this thread about the install and wiring of the EFI and maybe make a detailed thread on rear swaybar installation.

Cheers.

looking forward to the updates!

Good shit mang.

Good info. I'm currently converting my AH Civic '87 to D16A3 EFI. Does anybody know if the DA3 Integra tank will bolt into my Civic?

Id say not, totally diffreent chassis design.

DA9 Tank it is!

Thanks for that mate! Would non-stop rep if I could.

Thanks guys! Glad the info was helpful for others.

Just abit of extra info...

In the first page with the photo of the DA9 tank, on the right you can see the two main hardline fuel lines which would connect to the cabin. These hardlines are a bit long and can be cut to a shorter length inorder to run the connecting hose DIRECTLY to the hardlines inside the cabin.

I left mine untouched and just routed longer pieces of hose back to the cabin hardlines making sure there was enough hose for it not to kink.

have you finished the conversion? so very keen for a writeup!

Couple of things here.

Firstly, yeah, great writeup. Really appreciate any little bits of info that make life easier when doing mods like this.

Secondly, remember all low-pressure lines are held on by little clips; pressure lines, on the other hand, should use correct EFI hose and worm-screwed hose clamps. Also note the difference between plastic fuel filters (low pressure) and metal filters (EFI). Use a metal filter on EFI hose.

Finally, be careful cutting hardlines as you will see that some have their ends flared to allow a pressure clamp to sit over it giving a better fit and seal. Cutting this off leaves you with nothing to stop the pressure hose from "popping" off or dislodging. Might pay to invest in a beading tool to give that OEM look and functionality.

http://www.proalloy.co.uk/userdata/PRODPIC-301.jpg

Peter

Quote:

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Originally Posted by jdm_b16a

Couple of things here.

Firstly, yeah, great writeup. Really appreciate any little bits of info that make life easier when doing mods like this.

Secondly, remember all low-pressure lines are held on by little clips; pressure lines, on the other hand, should use correct EFI hose and worm-screwed hose clamps. Also note the difference between plastic fuel filters (low pressure) and metal filters (EFI). Use a metal filter on EFI hose.

Finally, be careful cutting hardlines as you will see that some have their ends flared to allow a pressure clamp to sit over it giving a better fit and seal. Cutting this off leaves you with nothing to stop the pressure hose from "popping" off or dislodging. Might pay to invest in a beading tool to give that OEM look and functionality.

http://www.proalloy.co.uk/userdata/PRODPIC-301.jpg

Peter

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Thanks for the tip Peter!

I basically used everything from the DA9 which was the donour car, just added in new EFI hoses and re-used the hose clamps that came with the DA9.... Should I change these hose clamps to new items?

I also bought a new DA9 fuel filter and mounted it onto the firewall to keep everything DA9 spec.

Cheers.

Quote:

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Originally Posted by ouch

have you finished the conversion? so very keen for a writeup!

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No I haven't, taking my time to make sure everything is done properly. Hopefully it will be in a drivable state soon though.

For anyone that reads this in the future da9 tank cannot be used for ed hatch. filler points are in different positions. I learnt this the hard way :(

Quote:

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Originally Posted by CivicEGSI

For anyone that reads this in the future da9 tank cannot be used for ed hatch. filler points are in different positions. I learnt this the hard way :(

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Yeah sorry this is true.

But you can change the filler connecting hose and it will still work. I'm now using an EF9 tank in my car (sedan)

Yeah, can always just get a longer filler hose.