13BTOY

iTrader: (1)

Has anyone used the gas tank drain as a pick up for efi? I just checked and my 85 has a drain plug. I was thinking of putting a fitting in place of the plug to run it straight to my efi pump(sort of like a sump). Any idea what the thread pitch is?

Thanks, Ed

cjrx7

You got a turbo in the plans? If so,Hell No,you need a real sump or the fc in-tank pump.

aussiesmg

iTrader: (1)

I purchased the through tank fittings from Summit, they will work on a regular tank as well as the fuel cell, then used AN fittings from there, note I picked up some fuel resistant silicone to ensure no leaks and make sure the spacers are thick enough. The lower rear edge of the tank is angled at 45 degrees which is a good location to ensure the ends are clear of the road debris.

As for a fuel pump my Aeromotive EFI pump is outside the tank nd supports up to 1000 hp

Directfreak

iTrader: (2)

Or use a GSL-SE Fuel Tank and Fuel Pickup, and keep it all stealth.

13BTOY

iTrader: (1)

I'm already using a surge tank set up with my turbo since I could not source an SE tank up here. This was just an idea coz I'm kind of being lazy about doing the FC pump mod.
Aussiemg, I'm curious to see those fittings that youre refering too.

Thanks, Ed

81gsl12a

iTrader: (1)

just spend the 80 bucks and get a rear sump



https://www.rx7club.com/1st-generation-specific-1979-1985-18/my-new-fule-system-pics-take-notes-lol-666589/

^^^^^^^ link of moe pics^^^^^^^

cheers PaTricK

trochoid

iTrader: (6)

Drain plug is a very bad choice for locating a pickup point. I've been modding tanks for the FC intank pump and sump cup. Just sent 2 off to Canada this morning. The mod isn't cheap, but it's the best way to go for turbo or efi applications. Tanks are fully refurbished inside and out. It's not a cheap mod, but well worth it for protecting your engine.

Jeff20B

iTrader: (13)

I have a rusty GSL-SE tank and a good '83 tank. I'm thinking maybe I could remove the sump cup from the -SE tank and somehow put it in the '83 tank. Is that a good idea? Or should I refurbish the GSL-SE tank and sell the '83 tank to cover the cost?

trochoid

iTrader: (6)

Depends on what model year 7 you plan on installing the tank. Iirc, they are not interchangeable beyween series. Mostly due to the configuration of the spare tire well. Depending on how bad the rust is, a tank can be cleaned and a liner coating applied to stop the rust.

rotary emotions

I used a surge tank from tweakit (australia, I'm sure something simular can be found in the US). It's fed by a Holley (or will be, car's in bits and pieces now ) and then feeds a SX performance "out of tank" pump. Easier than modding a tank.
The SX pump (or the large Aeromotive) is a bit overkill for street cars, I just bought it to be safe for later
If you're going EFI (but no turbo) with more normal power levels (let's say a S4/5 EFI engine) the setup can be rather cheap: a good pick up pump (even a stock SA pump will work, as it only needs to fill the surge tank, and doesn't need to build up pressure, but I wouldn't advise that) and surge tank won't cost you very much, and the EFI pump is needed with either of the setups.

rotary emotions

S1 and S2 are the same shape, S3 has a different spare weel well. But depending on who I can believe you can use it too. Anyway, we did test fit my '84 tank under my fathers '80 SA and it did fit.

Jeff20B

iTrader: (13)

In the '83. Both tanks should fit in both cars as both are series 3.

The GSL-SE tank is already out and sitting on a shelf. The '83 tank will be removed when there's nice weather. I'll take off the send/return fittings of both and have a look inside. If the GSL-SE tank is salvageable, I'll just use it and sell the '83 tank. Otherwise I'll have to remove the sump cup or make a new one and install it in the '83 tank, and use the GSL-SE send/return fittings.

kleinke

IIRC the European S2 had a deeper spare tire Well, to accomodate a full-size Tire flush with the rear deck. The North American S2 had shallow well for the small spacesaver tire. The gas tank from a full size Well should fit in any S3, but not vice versa. This information is my recollection, but if I am mistaken please correct.

Rotaryemotions, what size are the sparewheel Well of your S1, S2, S3 and in what country were they originally sold?