Quote:
Originally Posted by rockNroll
With a returnless fuel system the fuel regulation is done at the pump, inside the tank. The fuel never leaves and then reenters the tank. There may be a system with return from a fuel filter/pressure regulator but it would have to be from the Germans or Sweedes and I have yet to see it.
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Mercedes 202 have the regulator in an external flilter under the car near the tank. CIS and HFM systems had the regulator after the rail so, full circuit flow. ME moved the regulator to the back, similar to this kit so, any filings or debris from opening the system tends to go to the fuel rail and stay there. Some of the pictograms posted earlier in the thread show the filter preceding the pump. This is the case with the new direct injection deisel and gas engines which use injection pressures up into the hundreds of bar so the pumps are extra fussy about dirt and need the filter in front of them and the high pressure would make the filter can too expensive and heavy to position after.