Their is 2 small air bubbles in the primary fuel filter. Is that normal and if not, where should I start checking for problems...

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1984 300d....

It's fine if there is a little air in it. Mine has a small bubble too.

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Chad
2006 Nissan Pathfinder LE
1998 Acura 3.0 CL
OBK#44
"Pleasure in the job puts perfection in the work." - Aristotle (384-322 B.C.)

SOLD
1985 300TD - Red Dragon
1986 300SDL - Coda
1991 - 300TE
1995 - E320
1985 300CD - Gladys

It's about the size of a dime if a dime were spherical.

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1984 300d....

Yep, totally normal.

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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

Normal and next to impossible to get it out.

Once I tried getting it out....and failed.

Its normal.

On my car I am running a dealer MB pre-filter...which is long and white...can't see inside it. It has a little star on it.

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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

The clear pre-filters are great because you can put the shop light behind it (603 engine) and see the screen inside to check for crud. I rarely need to change it.

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Paul 1987 300 SDL; 2000 ML; '69 MGB; '68 VW Fastback

Advance Auto Parts tries to sell me primary fuel filters with paper elements inside. These will collapse and cut-off your fuel with B100, they might work for dino-diesel.

The bubble is always there.

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1991 350SD (updated rods)
Biodiesel B100 when I can find it.
Dino when really cold outside