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Old 02-18-2005, 07:04 PM   #1
TheKryptKeeper
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Default Gas Tank Trouble

OK, I need some help. I am eventually going to do a full AWD conversion onto my L wagon. For now, I am doing the gas tank. My old gas tank has 1 plug for the fuel pump and the new one (out of a 2001 2.5 RS) has 3 on the tank and 1 by the gas cap. I already put in the new gas tank and just pluged my single plug in. I also didn't have the mounting peices for the evaporator so I just sort of ghetto rigged it. I actually cut the evaporator off and attached all of the hoses together. I know that it was stupid but I needed to drive the car untill this weekend. Now, my gas gauge reads empty all of the time and I can't put any gas in the tank. It all just comes out. My question is, can I just take out the tank harness for the RS and run it in my L. Will it go into the same port and will my car know what to do with it? Did the older AWD impreza's have the same setup as the new ones? Thanks for all of your help.
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Old 02-18-2005, 09:31 PM   #2
Legacy777
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When you talk about plug.....are you talking about the electrical connection, or the fuel lines?

I know on the older legacies the float mechanism for both sides is tied to the one single connector. I did my swap and everything works just fine.

The AWD tanks will have 2 more vent lines that tie into a fuel separator, the output of the fuel separator is then fed to the charcoal canister.

There are 2 lines going to the engine, the supply line, and the return line.

As for the filling issues. There should be a vent hose that's connected to the filler neck tube as well.

check out some of the pictures of my swap and the fuel tank and how it's arranged. It definitely sounds like you have some issues going on.
www.surrealmirage.com/subaru/swap
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Old 02-19-2005, 12:28 AM   #3
TheKryptKeeper
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I'm talking about the electrical plugs that I have. Also, I am almost positive that I did it right, but the three lines on the driver side; which goes where? on the bottom of the car there are a triangle of conectors, but on the tank there is 3 lines one on top of the other. which goes where? I know that I shouldn't have done such a half ass job on it but any comments are greatly apriciated.

Also, does anyone have an explosion picture of the gas tank?
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Old 03-03-2005, 07:59 PM   #4
tbd
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Default I'd use your original electrics

And the new tank's housing only; you only need the shape. Old pump & wiring with new tank.

Rationale:
2001 vehicle has OBDII, hence the extra plugs.

Those of us w/ smog checks on a dyno will be able to attest that a gas cap check is part of the emissions system on the OBDII cars. (you mentioned a plug near the gas cap, it fails smog if the cap is loose in these parts)

Since your 94 is OBDI you'd be better off w/ your old pump & electrics until your engine demands a hi-flow. The extraneous plugs may be for systems you don't need at the moment. Save them for later.
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Old 03-03-2005, 08:48 PM   #5
AKGC8
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For your fuel gauge, you need to splice the green wire(pin 6) from your connector to the brown/white wire(pin 1) on one of the two unused connectors on the tank. 1 connector is for the gauge, the other is the pressure sensor. If it still doesn't work, it's because the ground is bad, that's a black/yellow wire(pin 5) on the larger of the 3 connectors on the tank. You'll just have to ground that out.

For the tank not filling, I'm guessing the ghetto rigged vent lines tied together is not allowing any air to vent out of the tank. To fix it, you have to re-ghetto rig it to where the vent lines are tied into the large hose going from the filler neck to the tank. You'll probably have to pick up a fitting somewhere to allow you to do that.

Everything should work fine after that.
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Old 03-03-2005, 09:46 PM   #6
TheKryptKeeper
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OK so it is a bad idea to go OBDII because I can probobly crank up my ecu higher without it. So do I need any of the crap that is on the top of the new gas tank? The way I figure is that I can get all of the lines and the evaporator hooked up like it was in the RS, then switch the wiring so that my plug will work on the new tank. My question then is: do I need to plug in any of the other crap on the top of the tank to make it work, or is that just useless stuff to "recycle gas vapors" and other BS.

In short, can I just modify my plug to make it work on the new tank and leave everything else unplugged with little or no reprocussions?

Thanks,
Krypt
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Old 03-03-2005, 09:59 PM   #7
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If you hook things up like I said in my post you won't need the evaporator and all the other crap.
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Old 03-04-2005, 02:10 AM   #8
TheKryptKeeper
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Well, I already have the entire wiring harness from the RS. This includes all of the wires that go to the gas tank. After I saw that the new tank wasn't working I figured that I should just change out the wiring and make my car OBDII. So is it better to have the crap on top of the tank or is it worse?

Also, I tried to hook up a vent line to the gas tank. It went from the neck to the middle of the tank as a strait hose and it still didn't work. Does anyone know what the vent line looks like on the new tank or could point it out?
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Old 03-04-2005, 08:07 AM   #9
AKGC8
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The only reason you should swap over to OBDII is if you're swaping an OBDII engine into it. That's a whole lot of trouble to go through for the gas tank when you can make it work like I said(I've run a WRX gas tank in a 1994 L). Besides, if you're planning on keeping your stock ECU, it won't run the OBDII stuff, and if you're planning on swapping the RS ECU, it won't run your engine right.

IIRC, the vent lines from the tank were on the left side of the filler hose at the tank. There may have been 2 of them, but I can't remember.
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Old 03-04-2005, 02:51 PM   #10
TheKryptKeeper
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OK, I am going to be swapping in a V8 WRX engine and for now, the stock RS ecu. That will make way for the standalone LINK system in a few months. So I suppose that because I am putting in the new engine, I should just wait and do it all at once.
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Old 03-08-2005, 07:08 PM   #11
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If anyone can help me then I am having sort of a crisis. I am putting in the gas tank now and still can't hook it up. I need a way to get my tank to vent. I opened up the OBDII crap and I found a lot of springs inside of plastic casses. Can I use these as vent lines without hooking up the OBDII stuff?
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Old 03-08-2005, 11:02 PM   #12
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The easiest thing for you to do right now is to put the old pump assembly into the new tank. The opening is the same, so it'll bolt right up. Viola.....no more unneeded plugs to deal with and your gas gauge reads right.

Jay Storm
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Old 03-09-2005, 12:36 AM   #13
AKGC8
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The wiring/plugs is the easy part to deal with(returned your PM, I think you've got the right wires there), it's the tank not filling that could be tricky.

I didn't think of this before, but check to make sure you didn't pinch the filler hose in between the tank/chassis/crossmember, I remember there being some tight spaces under there.

If it's not pinched, I'm almost certain that the problem is with the vent lines. I wish I could remember all the lines coming off the back of the gas tanks exactly, but I can't. I want to say there were 2 lines going into the OBD1 tank, a filler tube and a filler neck overflow drain. I want to say there were 4 lines out the back of the OBD2 tank(maybe 3, can't remember if there were 1 or 2 vent lines). The vent line/lines need to be tapped into the filler tube. The drain line I think I just ran directly to the tank connector for it.

Sorry, I did this over 2 years ago so I can't remember for sure how things looked back there. I know for sure that I tapped the vent line/lines into the filler hose though and had no problems.
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Old 03-09-2005, 03:10 PM   #14
TheKryptKeeper
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Switching over the pumps is out of the question because my car is a FWD car and the setup just didn't look right. I tried it and found that the float is on the other side of the pump. I didn't like it so I nixed that idea. I think that I solved the vent line problem with a lot of rubber end peices. I mainly am having a problem with the wiring because I want to use my stock wires on the new tank. I know its not the best idea but it needs to work for a short time. EBY and I are talking but if anyone knows what I need to do to get my fuel gauge to work off of my stock plug then speak up. I don't mind doing any hack jobs.

And time is a factor because I wanted to install the tank today.
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Old 08-10-2005, 12:03 PM   #15
TheKryptKeeper
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Long story short on this problem is it only read my gauge at half full when I had a full tank. Can anyone help?
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Old 08-10-2005, 02:19 PM   #16
Legacy777
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The contacts on the senders get corroded up. You can remove them, clean them, and you should be ok. If they're too corroded, you'll have to replace.
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Old 08-12-2005, 09:19 AM   #17
supermoose
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you're trying to run a EJ18 with a EJ25 ecu? thats interesting. lemme know how it goes.
running a JDM EJ20 on a ej25 na ecu would probably be a bad idea, althogh people have pulled it of-
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