I need some gas tank basics - JeepForum.com

 
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post #1 of 15 Old 09-13-2010, 04:11 PM Thread Starter
davegt
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I need some gas tank basics

So i just lowerd my gas tank and realized i dont know squat about what is going on with the basic operations. Im not sure why there 3 lines running toward the front. in the pic im guessing that the yellow and green arrow is for vapour return splitting to 2 lines (not sure why). So then im thinking red arrow is fuel to and black would be fuel back too tank. So if someone could help explain some of this to me that would great. also iwas wondering if this plastic tank would be the stock for my 83 cj5.
Thanks for any help...

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post #2 of 15 Old 09-13-2010, 04:56 PM
jeepman1
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i pretty sure the other two are just overflow tubes
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post #3 of 15 Old 09-13-2010, 05:48 PM
SlikRic
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Yellow and green are for the overflow, red and black run up to the fuel filter (larger one gas to filter/carb, smaller one return line from the filter. Can't tell which is which by the pic)

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post #4 of 15 Old 09-13-2010, 10:52 PM
wrongway92407
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The 2 plastic valves are roll over check valves, they are usually connected together by a plastic Y. The larger hose is the fuel line crosses over at the rear cross member and goes to the fuel pump on the right side of the engine the other is a fuel return line comes from the small line on the fuel filter and returns excess gas back to the tank. Be sure to replace all the line since you have the tank out.

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post #5 of 15 Old 09-14-2010, 09:17 AM
83vert
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My CJ also has a plastic tank but I thought it was aftermarket. Are these tanks stock?
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post #6 of 15 Old 09-14-2010, 09:37 AM
Mike1084
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Might also want to do a seach on CJ fuel system diagram. IIRC there are pics from the service manual showing factory set up.

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post #7 of 15 Old 09-14-2010, 10:04 AM
84jeepjohn
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FYI the one mike showed is for a 15 gallon. The plumbing is way different

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post #8 of 15 Old 09-14-2010, 12:46 PM
wrongway92407
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Those are factory tanks, I believe it was an option. and 84jeepjohn is correct a 15 gal tank is a whole different animal with the the valves located under the left rear 1/4 panel behind the light

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My fleet:
86 CJ7 5.7 vortec. 4L60,D44's,OBA,Air tank bumpers w/D rings detroits,4.88,35" bfg, mt's 9500ti warn
86 CJ7 2.5 detroits, OBA 4.56, air tank bumpers, w/D rings,9500I warn 31x10.5x15, Trxus
86 CJ7 bone stock, w/factory 44 never seen the dirt soon to be for sale
87 Wrangler also never seen the dirt.
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post #9 of 15 Old 09-14-2010, 02:27 PM
84jeepjohn
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From what I can see I'm the pic. Your line between the check valves is backwards. The one off the sending unit is the suply line to the motor and the one I can't see right next to the supply is the return

If you have it out I'd suggest changing all the stuff so you don't have to worry about it. The check valves and grommets are the same as for a YJ (FYI just replaced all my stuff) I had to order them from the dealer about $55 for 2 valves and 2 grommets

I also went ahead and did the sending unit, o-ring, and filter sock at the same time

On a personal note my old tank did not have any insulation on the center hold down strap. And after 25 years cut the tank. When I got another, I cut some of the extra rubber liner to give some cushion.

84 CJ-7 RE 4.5" lift TJ flares and 35"BFG's
4.88's and OX lockers front and rear
2000 Grand Cherokee, 2" lift, BFG AT's (SOLD)
2005 Z71 Suburban with 1.5" rear spacers, and front leveled
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post #10 of 15 Old 09-19-2010, 06:22 PM Thread Starter
davegt
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jeepjohn...Im not sure what you mean backyards...also should the line coming from the green arrow be smaller or was that a P.O. job.
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post #11 of 15 Old 09-19-2010, 06:36 PM
84jeepjohn
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Quote:
Originally Posted by davegt View Post
jeepjohn...Im not sure what you mean backyards...also should the line coming from the green arrow be smaller or was that a P.O. job.

the yellow is the vent from between the two check valves and then it goes up to the charcol canister (mine has a green plastic hose by the front)

the tan line is the pick up going to the motor (5/8 I belive)

the blue is the return line from the fuel filter by the carb (smaller than the suply line)

84 CJ-7 RE 4.5" lift TJ flares and 35"BFG's
4.88's and OX lockers front and rear
2000 Grand Cherokee, 2" lift, BFG AT's (SOLD)
2005 Z71 Suburban with 1.5" rear spacers, and front leveled
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post #12 of 15 Old 11-30-2012, 09:13 AM
Rander911
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I have a 1983 Jeep CJ5 with the exact same tank as you. I am trying to replace that tank but cannot find any sources that recognize that tank. Does anyone know where I can get a tank that is pictured above?
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post #13 of 15 Old 11-30-2012, 11:11 AM
texasdave
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Quadratec has one for 279 with all the mounting hardwre.
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post #14 of 15 Old 11-30-2012, 01:45 PM
wm69
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OEM plastic 20 gal tank there are not any direct fit replacements. You can get new sending units for them, but if you need a replacement tank you'll have to find an original used one. There ARE aftermarket 21 gal tanks, but they don't fit the factory 20 gal skids.

You can also get aftermarket skids (Kilby, for one) for the factory 20 gal tanks, but again, the 20 gal OEM-style tanks themselves are not available new.

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post #15 of 15 Old 11-30-2012, 06:34 PM
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My CJ came with a 21 gallon tank and replaced it with a 15 gallon tank and all of the necessary parts from MTS. To do it right, you also have to install a rollover valve (available new) and a liquid check valve (no longer made, but not hard to find used) so that your Jeep has the parts that would have been there if it came with a 15 gal. So it's not a cheap proposition by the time you buy everything but it's better than having an old, leaky tank.

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