Originally Posted by dkveuro

I need to remind everyone about pulling too hard on the fuel supply line in the engine bay....if it is still stock size.

Diesel will produce a vapor bubble when subject to negative pressure ( Slight Vacuum.) These bubbles will not collapse back into liquid fuel even after the pressure is positive again.

So, if you pull hard on the stock tank outlet, you will run into fuel supply getting vapor bubbles to a greater or lesser extent....none of this is good.

If the engine is under heavy load when this occurs you will have reduced power...eg: Powering past a semi truck up hill is not where lack of power is wanted.

Diesel fuel should flow no faster than 4 feet per second to the lift pump. Increasing the fuel line id will reduce the fuel flow speed.

The W210 606 fuel supply is too small for any turbo motor. You can drill out the tank outlet to 12 mm which nearly doubles the flow capacity. Then continue the 1/2 inch line to the pre filter screen in the filter housing by passing the fuel heat exchanger which is also restrictive.

Pulling fuel with electric pumps without the above modification will cause vapor bubbles in your fuel supply.


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