gas tank swap! - JeepForum.com

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post #1 of 25 Old 09-08-2009, 09:26 PM Thread Starter
87TPIYJ
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gas tank swap!

ok so i have an 87 which came with the true 15 gal tank. I just picked up the 20 gal off a 93 w/ sending unit and fuel pump for $25. Gonna go pick up a skid plate some time soon. I was just wondering if any one else has done this swap? There are two "roll over valves" on either side of the tank that appear to T together and run to engine vacuum. Is that correct? On my old tank to pretty decent size lines (that definatly carry gas) T together and run to this mini black milk jug looking thing behind the passenger side rear lamps, then a vac line runs off that to the engine.<<< can i get rid of the milk jug thing???


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post #2 of 25 Old 09-08-2009, 09:28 PM Thread Starter
87TPIYJ
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also with the newer tank came a stronger fuel pump. is this fuel pump strong enough by itself to run a chevy tpi set up? currently i have an in-line fuel pump piggy backed, was trying to see if i could ditch that.

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post #3 of 25 Old 09-08-2009, 09:29 PM
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The black thing is the evap cannister and is part of the emissions system - not legal to remove it.

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post #4 of 25 Old 09-08-2009, 09:49 PM Thread Starter
87TPIYJ
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no it is not that. i know what the evap canister is and that is under my hood, where the vacuum line eventually goes. this is in the rear of the vehicle. behind the brake lamp

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post #5 of 25 Old 09-08-2009, 09:52 PM
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I believe the stock yj pump for a 6 cyl is 40 lbs, how much pressure does the tpi setup need to run?
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post #6 of 25 Old 09-08-2009, 10:08 PM
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The pump will run up to about 60 psi or more mine did when i tested with a gauge and no relief in the output. 93 tanks had a rollover safety feature on them that is what the line goes to if I'm not mistaken. Also you need to check that in the vent line going to the gas cap does not go to far into the tank or you have a 15 gal tank still. I removed both the fill inner stop and vent stop. On here look up 5 extra gallons for a writeup on this.

A 89 yj with a 4.0 aw4 sye out of an 92xj. Now the hard part is done time to get it up in the air just a bit. Working on 8.8 with 3.73 and lsd for the rear. and new D30 hp with 3.73 .
For those who have not figured this out I'm old school but can handle the new too.
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post #7 of 25 Old 09-08-2009, 10:36 PM
nfisher50
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the black thing you are referring to is a roll over check valve. It vents vapor to the evap canister.
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post #8 of 25 Old 09-08-2009, 10:49 PM
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Doh, you said passenger side rear not front, yep that's the check valve like mentioned.

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post #9 of 25 Old 09-08-2009, 11:15 PM Thread Starter
87TPIYJ
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Quote:
Originally Posted by nfisher50 View Post
the black thing you are referring to is a roll over check valve. It vents vapor to the evap canister.
So if that is the old rollover check valve, then I assume I can get rid of it considering there are two on the top of the new tank. Meaning I would run vac lines from the tank ones to a T so they are one then send them to the vac cannister. Is this a correct assumption?

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post #10 of 25 Old 09-08-2009, 11:18 PM Thread Starter
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Definatly checked the vent line to make sure it wasn't running Down into the tank thanks though for the info!

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post #11 of 25 Old 09-09-2009, 07:59 AM
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Quote:
Originally Posted by 87TPIYJ View Post
So if that is the old rollover check valve, then I assume I can get rid of it considering there are two on the top of the new tank. Meaning I would run vac lines from the tank ones to a T so they are one then send them to the vac cannister. Is this a correct assumption?
Yes is the simple answer.

A 89 yj with a 4.0 aw4 sye out of an 92xj. Now the hard part is done time to get it up in the air just a bit. Working on 8.8 with 3.73 and lsd for the rear. and new D30 hp with 3.73 .
For those who have not figured this out I'm old school but can handle the new too.
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im just cheap, and cheap makes you creative.
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post #12 of 25 Old 09-09-2009, 08:22 AM
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Fuel pressure is not your friend. The MPI ran 60-100PSI pumps regulated down to 40. The TBI ran 40-60 regulted down to 15. I was going to do exactly what you are trying right now and I got a little freaked by the delta in the pressure. I didn't think the regulator would hold up. I opened my tank to check the specks on the pump that was in there and found a gelatinous goo that was left over after the previous owner used ethanol. You should be able to do it, but keep a spare regulator handy, just in case.
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post #13 of 25 Old 09-09-2009, 10:44 AM Thread Starter
87TPIYJ
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thanks guys, i called autozone and the tpi pump and the pump out of the 93 are almost the same specs. I believe the tpi setup it needs 35ish pounds to open the injectors

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post #14 of 25 Old 09-09-2009, 07:17 PM
dodger889
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I thought a tpi was different from a tbi system?

A 89 yj with a 4.0 aw4 sye out of an 92xj. Now the hard part is done time to get it up in the air just a bit. Working on 8.8 with 3.73 and lsd for the rear. and new D30 hp with 3.73 .
For those who have not figured this out I'm old school but can handle the new too.
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im just cheap, and cheap makes you creative.
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post #15 of 25 Old 09-12-2009, 02:51 AM Thread Starter
87TPIYJ
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It is tpi is direct port injection as to where a TBi is throttle body injection (electric carb basically)

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