(FUEL) Interchangeability of Fuel tanks- The facts.
#1
(FUEL) Interchangeability of Fuel tanks- The facts.
I've noticed a few questions and misconceptions about the 84-85 S3 fuel tanks lately.
This thread will address the myths and facts between the FI and Carb, (13b/12a) tanks for the S3 only.
MYTHS:
1. The SE has baffles, the others don't.
2. You can't interchange the tanks.
a. Can't use an SE tank with a 12a.
b. Can't use a 12a tank with a 13b.
Facts:
1. Both tanks have baffles. The 13b/SE tank has a 'cup' that the fuel supply and return tubes sit in.
2. Yes you can.
a. No problems or risks with this swap. It is a direct fit.
b. You can, but since the 12a has no 'cup' to maintain a constant fuel supply for the pickup, a surge tank is recommended. This becomes especially critical if you are boosting!
Both tanks are identical in construction and configuration, with the exception of the 'cup' in the SE tank.
Both tanks have the same bolt pattern for the pickup and return assembly, they ARE interchangeable.
Note the pics below. I have yet to figure out how to include them in the body of a thread, so bear with me. (But Jon has... so here I come to edit!)
Pic 1. 12a tank on the left, 13b on the right.
Pic 2. 12a pickup assembly on the left, 13b on the right. Note difference in the filters and the size of the hard lines.
Pic 3. The 'cup' in a 13b tank. Not a good pic, but you get the idea.
For those of you who are doing 13b swaps, in a non-SE, I recommend the SE tank, and the SE hard fuel lines. If you cannot find a good SE tank and lines, then add a supply line the next size larger, use the existing supply as a return line, remove the original return and add a surge tank. The easiest way to do this is source an SE pickup, otherwise you will need to have a larger pickup tube added into the assembly.
I hope this clears a few things up.
Scott.
This thread will address the myths and facts between the FI and Carb, (13b/12a) tanks for the S3 only.
MYTHS:
1. The SE has baffles, the others don't.
2. You can't interchange the tanks.
a. Can't use an SE tank with a 12a.
b. Can't use a 12a tank with a 13b.
Facts:
1. Both tanks have baffles. The 13b/SE tank has a 'cup' that the fuel supply and return tubes sit in.
2. Yes you can.
a. No problems or risks with this swap. It is a direct fit.
b. You can, but since the 12a has no 'cup' to maintain a constant fuel supply for the pickup, a surge tank is recommended. This becomes especially critical if you are boosting!
Both tanks are identical in construction and configuration, with the exception of the 'cup' in the SE tank.
Both tanks have the same bolt pattern for the pickup and return assembly, they ARE interchangeable.
Note the pics below. I have yet to figure out how to include them in the body of a thread, so bear with me. (But Jon has... so here I come to edit!)
Pic 1. 12a tank on the left, 13b on the right.
Pic 2. 12a pickup assembly on the left, 13b on the right. Note difference in the filters and the size of the hard lines.
Pic 3. The 'cup' in a 13b tank. Not a good pic, but you get the idea.
For those of you who are doing 13b swaps, in a non-SE, I recommend the SE tank, and the SE hard fuel lines. If you cannot find a good SE tank and lines, then add a supply line the next size larger, use the existing supply as a return line, remove the original return and add a surge tank. The easiest way to do this is source an SE pickup, otherwise you will need to have a larger pickup tube added into the assembly.
I hope this clears a few things up.
Scott.
#2
FB+FC=F-ME
The cup is very similar to the one in the FC tanks.Many people call that cup a slosh baffle (thats what it does) so that may contribute to the,"12A tanks have no baffles" myth.Just a misunderstanding caused by different terminology.Both tanks have bulkhead baffles going from top to bottom,but only the SE has the pickup baffle around the intake/return pipes.Good pics!
#3
V8 RX-7
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You might want to note that when swapping an FB (SE or non) tank into an SA car, you need to cut the spare tire well and raise it up about 2" for the tank to sit flush.
The SA spare tire well is deeper then FB (SE for sure)
The SA spare tire well is deeper then FB (SE for sure)
#4
Originally Posted by steve84GS TII
The cup is very similar to the one in the FC tanks.Many people call that cup a slosh baffle (thats what it does) so that may contribute to the,"12A tanks have no baffles" myth.Just a misunderstanding caused by different terminology.Both tanks have bulkhead baffles going from top to bottom,but only the SE has the pickup baffle around the intake/return pipes.Good pics!
Originally Posted by Phiber Optik
You might want to note that when swapping an FB (SE or non) tank into an SA car, you need to cut the spare tire well and raise it up about 2" for the tank to sit flush.
The SA spare tire well is deeper then FB (SE for sure)
The SA spare tire well is deeper then FB (SE for sure)
I would rather post no information, than information that is questionable or in doubt.
I've owned 1 S2, and it met the sawzall quickly, it was really that badly rusted. Most of my experience is with S3's and S4's. The S4 tank is a definite no for a swap. The S2's, I do not know if they are interchangeable or not.
#5
Thunder from downunder
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S2 gas tanks are the same as S3 12a 84/85 tanks but the fuel sender has only two wires.
All will interchange on 81-85 models. If you have the 84-85 model use your sending unit. If you have the 81-83 model then use your sending unit when interchanging between the years.
79-80 tanks will not fit in the later years.
All will interchange on 81-85 models. If you have the 84-85 model use your sending unit. If you have the 81-83 model then use your sending unit when interchanging between the years.
79-80 tanks will not fit in the later years.
Last edited by Rx-7Doctor; 11-03-07 at 01:19 PM.
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#8
Never Follow
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Originally Posted by aussiesmg
S2 gas tanks are the sae as S3 12a 84/85 tanks but the fuel sender has only two wires
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