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Originally Posted by diesel_john
Does the TDI recirculate fuel back to the tank like my rabbit does.
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Yes it does.
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Did you buy it new or used (could the injectors have been changed.
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The car has been in the familly since new and has 200000 miles on stock injectors. I'm installing new nozzles this summer so that should help.
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Does it otherwise run good ( start good in the winter, good mpg).
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It runs pretty good. Never had starting issues and I got it to 45 mpg driving like I stole it last summer when I was really not into FE.
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This is a very interesting issue. I would like to learn more about it.
If the car is running good with no codes then I would lean more to OBD interface related. Is the computer stock? Is there anything fuel related that has been worked on?
If the engine is starved for fuel then the ECU will increase pulse width to compensate.
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The ECU is stock, but I installed a pot in line with the piston movement sensor of the fuel pump so I can dump more fuel in, and a turbo bleed so I can get more air in. I haven't touched those since I started driving for FE though.