1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

Gas Tank Q?

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Old Jul 10, 2005 | 06:59 PM
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From: Waxhaw, NC
Gas Tank Q?

Apparently from what Im told is the gas tank in my 83 gsl is no good. Need to know if anyone knows where to get a new one cheap or if anyone might have a used one that is still good on the inside. The only price I've got so far is 900 somethin for a new one and thats a little steep for me at the moment. tnks
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Old Jul 10, 2005 | 08:34 PM
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Mazdatrix has new ones for 400 to 800 new. I have one in an 82 in NC. PM me if you want to buy it.
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Old Jul 10, 2005 | 09:06 PM
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well my gas tank was really bad with rust. I restored mine. here is where I got the stuff to do it. A lot cheaper way to go

http://www.prp-porshop.com/merchant....gory_Code=Kits
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Old Jul 10, 2005 | 10:01 PM
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pm rx7doctor, or see his thread: https://www.rx7club.com/showthread.php?t=438622

I was going to buy it, but after consideration I think I'm going to go with a fuel cell instead of sticking with the stock tank.
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Old Jul 11, 2005 | 06:55 AM
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Talk to us about fuel cells ,please.
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Old Jul 11, 2005 | 08:24 PM
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From: Waxhaw, NC
tnks

Yea, I already tried to get the tank redone. The guy I bought the car from let the car sit for 12 years with I think about half a tank of gas in it. When I got the car, what was in the tank came out as a paste. The carb was shot, so all at once I had a Holley setup with Racing Beat SP exhaust, the gas tank redone with a new sending unit and a holley red top fuel pump. Since I got the car back it was always starving for gas. So I took it to my mechanic and he said that he could barely blow through it and it would barely draw. Now it doesnt run at all. I think it was the person who redid the gas that is at fault for the problem, cause they sealed the vents and everyother thing. Thanks for all posts and Ill try to get back to yall as soon as possible. tnks
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Old Jul 11, 2005 | 08:35 PM
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From: Union Mills NC
Pull your tank and run some wire down in to clean the pickups. I have also had good luck using carb cleaner to open them back up.

Rig a pump to cycle the fluid out of the tank and back into it. pour it full of something that eats gass and let it cycle through a filter.
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Old Jul 11, 2005 | 08:41 PM
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Theres only one vent tube, and it comes out with the pickup and return lines on that top cover, so its hardly possible it was clogged during the sealing process. Did you change the fuel filter at all? Please say you did, lol. Theres also a fuel cut valve on the sending line for roll over accidents and stuff that could be partially closed, or clogged with old gas still. I would check that as well. Its a small plastic device thats mounted to the frame rail. I took mine out when I redid my fuel system since I figured if it rolls or I crash and need it to shut off, I have bigger things to worry about. Plus my pump was wired so it would only run if the engine was running (not just key on), so if the engine stalled, the pump would stop anyway. I would disconnect the lines at the tank, and blow compressed air through them to make sure theyre clear before doing anything too drastic. Then, if that checks out ok, drop the tank, pull off that top cover and make sure the lines are clear going in, out, and the vent. The tank simply holds the gas, its not in charge of getting it to the engine, thats what all the lines do. However, if chunks from the inside of the tank are clogging the pickup screens, or the filter over and over again, then you need a new tank, lol.

~T.J.
Attached Thumbnails Gas Tank Q?-fuelcut.jpg  
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Old Jul 11, 2005 | 09:35 PM
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Too late to edit, just thought Id add my 83 had a drain plug on it, so you could drain it before you drop the tank.

~T.J.
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Old Jul 11, 2005 | 11:59 PM
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From: Houston
Originally Posted by Bob Holton
Talk to us about fuel cells ,please.
count on spending at least $300-500 for anything decent.
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Old Jul 12, 2005 | 08:26 PM
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From: Waxhaw, NC
thnk

thanks TJ for all the info. I think Im just going to replace it, Ive put thousands into the car in the last 6 months with clutch, brakes ect...... I might as well just hit it at the source. RX7Doctor is sending me a tank that he guarentees rust free that was just shot and sealed. As long as that car sat no wonder why im having problems with it. The car ran fine the first week I got it back and then slowly deteriorated from there, goin through a fuel filter at least every 3 thousand miles. As TJ about the vent being in the pickup, I didnt know that. So is it possible that my mechanic installed it improperly? I was also thinking that it was installed improperly because the car ran differently depending on the amount of gas in the tank. Full, ran perfect, the lower I got on the tank, slight hesitation before taking off ect...
Tnks for all the help
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Old Jul 12, 2005 | 09:16 PM
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I was also thinking that it was installed improperly because the car ran differently depending on the amount of gas in the tank. Full, ran perfect, the lower I got on the tank, slight hesitation before taking off ect...
Hmm, that almost sounds like maybe the fuel lines were hooked up wrong, so it was actually trying to get the fuel from the vent line, or the return line. On the outside, there are three tubes. On the inside, there are three tubes of DIFFERENT LENGTH. If he had hooked the feed line to the carb up to the return line on the tank, the tube inside the tank wouldnt go low enough into the fuel, hence the hesitation (float bowls running empty). Same with the vent line. The tubes on the tank are different diameters, as are the lines on the chasis, and going into the carb. The feed line is a larger diameter than the return line. Once again, hooked up improperly would cause a lack of fuel flow. So even if the rubber lines were hooked to the tank right, they couldve been switched when going to the hardline up to the engine bay so the pump was trying to push fuel through too small of a hard line. You tracking?

To summarize, I would start with a fresh tank if yours is rusting that bad, then get all new rubber lines (I just like to know they arent rotting away, and theyre cheap). Run new lines from the tank input/output and vent to the hardlines on the chasis. Then, new rubber lines from the chasis hardlines in the engine bay to the carb.

I copied some stuff outta the FSM and attached it that might help you. Good luck

~T.J.
Attached Thumbnails Gas Tank Q?-lines.jpg   Gas Tank Q?-tank.jpg  
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