Fuel tank 20gallon CJ7 - JeepForum.com
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post #1 of 41 Old 10-07-2017, 12:27 PM Thread Starter
Nick4320
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Fuel tank 20gallon CJ7

So I have the 20 gallon gas tank on my 85 CJ7, when I get a fuel tank of gas the vac can is sucking up gas and leaking. So I thought it would be the liquid check valves on top. Replaced them still having the issue.

I noticed when getting gas this time my gauge showed the tank being about a 1/4 past full, not quite sure if this indicated anything.

I know I can't get a new replacement tank unless I mod it for the 15 gallon setup, not looking to do that.

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post #2 of 41 Old 10-07-2017, 01:06 PM
LumpyGrits
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Cj

Nut'n wrong with the tank.
The sender with the fuel lines needs inspection.
LG

Have'n you along, is like loose'n 2 good men
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post #3 of 41 Old 10-07-2017, 01:34 PM
Matt1981CJ7
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Nick,

There's a filter in the bottom of the vapor canister. When that filter gets clogged with mud and road grime, which happens frequently, the vacuum source for the canister will suck fuel from the tank instead of air thru the filter as it should.

You can replace that filter, but the old one may be kinda difficult to remove from the canister. I believe they still sell replacement filters. If not, you can cut a Chore Boy scrubber pad to size, and stick it in there. Of course, a new vapor canister is also an option to consider, especially if yours is the original.

Good luck,

Matt


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post #4 of 41 Old 10-07-2017, 03:38 PM Thread Starter
Nick4320
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Matt, I checked the vac can, there's not filter on the bottom, unless it's sealed inside.

I believe its the original. I'm looking at getting a me can right now but can't seem to find an OEM one. I was hoping to find one maybe better then OEM. Any suggestions?
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post #5 of 41 Old 10-07-2017, 03:53 PM
Matt1981CJ7
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Yes, the filter is inside. It should look like the canister on the right in the pic below, if it's original.

New OEM style canisters have become a unicorn to find, but you use this Delorean canister as a suitable replacement. It should even fit in the factory bracket.

https://store.delorean.com/p-6675-carbon-canister.aspx

Matt
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post #6 of 41 Old 10-07-2017, 03:57 PM Thread Starter
Nick4320
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Yeah it looks like the one on the right but with out the cotton piece.

As for the new one, it looks like it only has 3 ports, the OEM has 4 does one not get connected?
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post #7 of 41 Old 10-07-2017, 04:02 PM
Matt1981CJ7
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The canister in your pic looks like it has a filter to me. Perhaps is so caked with mud, it's difficult to tell.

Anyway, the Delorean canister is a 4 port. They are just in a different configuration than the Jeep version. The ports will all be labeled for you.

Matt


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post #8 of 41 Old 10-07-2017, 04:15 PM Thread Starter
Nick4320
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Awesome thanks Matt, think you just saved me a whole mess of trouble
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post #9 of 41 Old 10-07-2017, 05:05 PM
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I bought one of the delorean canisters from a link Matt posted awhile back. The delorean canister has 4 ports as Matt said and they are labeled. I had to get some tubing as what was on my jeep wasn't the right size so good time to get all new hoses for the hookup. Also, the delorean canister is a little fatter than the stock one, but it will still fit into the stock circular clamp. Pretty easy job to change over and I've had no problems with it.
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post #10 of 41 Old 10-07-2017, 05:43 PM Thread Starter
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Just ordered that can

The can I have on there, the only way to remove the filter would be to cut into it. So I'm guessing that's an internal filter which is probably clogged and causing my issues
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post #11 of 41 Old 10-07-2017, 05:52 PM
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Quote:
Originally Posted by Nick4320 View Post
Just ordered that can

The can I have on there, the only way to remove the filter would be to cut into it. So I'm guessing that's an internal filter which is probably clogged and causing my issues
Yeah, the canister filter isn't an easy replacement. It can be done, but... hence my warning earlier.

It's probably best that you are replacing the whole canister.

Keep us updated.

Matt


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post #12 of 41 Old 10-12-2017, 05:27 PM Thread Starter
Nick4320
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Got the vac can today. Installed it after work. Drive it around and it seemed fine no noticeable issues. Tomorrow I'm going to take her to the gas station and fill her up. Fingers crossed all goes well and no leaking.

On a side note, here are the pics of the can. The breather is still on the bottom.
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post #13 of 41 Old 10-13-2017, 01:27 AM
Matt1981CJ7
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Well, did the new canister solve the fuel siphoning problem?

Matt


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post #14 of 41 Old 10-13-2017, 04:46 PM Thread Starter
Nick4320
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Filled up, no siphoning or gas anywhere it shouldn't be. New can works perfectly
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post #15 of 41 Old 10-14-2017, 11:41 AM
Matt1981CJ7
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That's great!

Glad you didn't drop the tank, unnecessarily.

Matt
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