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I have an 85 2.0 SI with only 72k miles. Grandma bought it off the show floor back in the day and has handed it over in my possession. They've had a lot of maintenance and repairs done to it so its in great shape.....however, for the past 10 years or so they did not drive it a lot. It was used to go to the doctors or grocery store 3 times a month, garage kept all the time. I have a feeling the gas tank might have rusted out and is bogging me down, the car runs great on start up but once it gets warmed up the accelerator might as well be the brake pedal. I have replaced the fuel filter and had a new converter installed. It seemed to help but now the issue is coming back to haunt me. Anyone have any advice ? The old fuel filter was the stock one from Japan and looked rough so I was thinking of replacing the gas tank, but that's a needle in a haystack To find ?
 

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Gas Tank

two options take off old one inspect it if it looks ok you might get away with taking to petrol tank specialist and they can cut it in half remove the rust and weld back together then coating in a petrol proof coating all over to stop any further decay. Other option remove tank and replace with ally one custom made (expensive) or one that's already available off the shelf and mount in the boot if you don't need boot space that is, but that's not ideal as it raises centre of gravity and weight behind the rear wheels.

Have you tried draining the old tank to see what comes out? I stuck a larger speaker magnet at one of the rear corners so that any rust gets caught by that and not by the pickup, but I expect one day it will need to be replaced or repaired at somepoint.
 

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I find it odd for you to jump to rusty fuel tank right away, certainly a possibility here though. Get yourself a drain pan, put it under the fuel drain bolt and see what comes out.

It could be a leaking fuel injector, since you said you have an SI. I'd do a full tune up ( plugs, cap and rotor, coil, air filter, plug wires etc. ) before you condemn the fuel tank.
 

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tanks

I agree I'd check a whole load of other things first, as a lot of parts are held in place by rubber or sealed by rubber rings etc. likely could be some issues there as well as possibly suspect injectors etc. Also have you done a compression test at all? and I'd also check clearances on the valves to rockers.

Just to be also sure I'd pull all the intake hosing off and make sure nothing is blocking it never know mouse may have made a home inside the intake and filled it full of crap and it's blocking your Throttle body mouth. This stuff does happen when cars been left sitting around in garages for long periods of time!
 
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