FM100 5 micron before secondary filter? - PeachParts Mercedes-Benz Forum

ForcedInduction · #1 08-29-2011, 10:50 PM

Quote:

Originally Posted by layback40

Your finest filter should be just before the IP/high press pump.

Right. The lift pump is just a diaphragm and check valves, it doesn't need protection against anything except debris large enough to jam a check valve open.

Quote:

If you have a fine filter first & the other filters get dirty, its a sign that the fine filter has failed & not just plugged.

On top of that statement, 95% of the fuel pumped through the system gets returned to the fuel tank. Its constantly filtering the entire fuel tank so multiple fine filters are not needed.

Diesel911 · #2 08-29-2011, 11:27 PM

Quote:

Originally Posted by ForcedInduction

Right. The lift pump is just a diaphragm and check valves, it doesn't need protection against anything except debris large enough to jam a check valve open.

On top of that statement, 95% of the fuel pumped through the system gets returned to the fuel tank. Its constantly filtering the entire fuel tank so multiple fine filters are not needed.

I thought the Mercedes Fuel Supply/Lift Pumps had a Piston in them?

ForcedInduction · #3 08-29-2011, 11:55 PM

You are correct.