IIRC, the primary filter is the spin on and the secondary is the small plastic one. I went through many plastic filters while the bio-d was cleaning out the system.

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RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K

90 Dodge D250 5.9 Cummins/5 speed. 400K

I would also try reversing the fuel delivery and return lines under the hood. On my 300d, as long as you have 3 gallons in the tank it'll suck through the return line. That's a good way to get home if you get stuck, but also a good way to see if it's the tank screen and if you're lucky the pressure of the fuel returning could blow it clean.

I would also try setting up a fuel cell under the hood with a milk jug or something similar.

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1998 E300D, 287k, barely broken in.

What about creating a small tank in the engine compartment, like the DieselGiant does to do an engine purge, until you can get the tank cleaned? All you need are a couple of hoses , clamps, and a plastic fruit jug.

As a quik check, and to get you home if you are stranded, reverse the fuel lines. take the fuel return and connect it to the primary filter and take the fuel line and connect it to the return. This will eliminate the tank screen, Make sure you are over 1/4 full as otherwise the return line in the tank is goiing to be exposed to air not fuel.

I second doing the compressed air blow out of the lines. I did that on the 300SD I had and it worked very well.

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"I have no convictions ... I blow with the wind, and the prevailing wind happens to be from Vichy"

Current
Monika '74 450 SL
BrownHilda '79 280SL
FoxyCleopatra '99 Chevy Suburban
Scarlett 2014 Jeep Cherokee
Krystal 2004 Volvo S60
Gone
'74 Jeep CJ5
'97 Jeep ZJ Laredo
Rudolf ‘86 300SDL
Bruno '81 300SD
Fritzi '84 BMW
'92 Subaru
'96 Impala SS
'71 Buick GS conv
'67 GTO conv
'63 Corvair conv
'57 Nomad

YDNRC.

It's the other way around.