What the heck is going on ....

...with my fuel supply that is. '86 Hatch, JDM engine, Hitachi 2bbl. Finally got the carb running good, but the car continues to act like it is vapor locking. I've cleaned the tank 4 times (actually pulled it out and flushed it..), replaced the fuel pump, replaced ALL of the rubber lines, and have replaced the filters many times (prob over 15 filters...tank still has rust in it.....) Car might run great for a week and then it will start starving for fuel going down the road. BTW, the pump runs continiously. Their is no vapor seperator anymore. Bascially gas come from pickup in tank, through filter one, through pump, down hard line, out fire wall, into filter 2, to Y-fitting @ carb, return line comes off Y-fitting @ carb, and is running back down the return line to tank. I've blown out the hard lines, but I still suspect there might be something in it blocking the flow once in a while...... I'm considering running rubber hose from the carb to tank to verify that the hard lines are or aren't the problem. This is really starting to get old.....

Anyone else ever have a problem like this?

Any thoughts?

Thanks,

NV