Are there any side effects to not using the fuel thermostat in the 603 engine,my car came with it bypassed, i guess they didnt want to replace the oring? not sure but was wandering if anyone knew how important it is to have this running,i am in Northern California, thanks.

I bypassed mine and drove it about 60K before the car died. I can't contribute the death to the fuel heater though.

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Muleears
'07 E320 Bluetec 133K my DD
'04 Jaguar XJ8 VDP, 34K
'10 Hyundai Accent 60K Grocery Getter
'02 VW Golf soon to be on the road again
'97 E300 Diesel Son's DD
'61 VERY tolerant wife

Hampton Roads, VA USA

Gone but not forgotten:
'67 250S 95K
'86 300SDL
'87 300D Turbo, 364K! R.I.P.
'98 E300 Turbodiesel, 213K
'02 S420, 164K
'01 Prius 138K

Its just a nicety for cold weather afik. Won't hurt a thing to not have it unless your fuel gelled up because it was so cold. Then it would help if you were heating your fuel.

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What Would Rudolph Do?
1975 300D, 1975 240D, 1985 300SD, 1997 300D, 2005 E320 , 2006 Toyota Prius

I'm about to rebuild mine I've put about 4,000 miles on the car with it bypassed

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hum.....
1987 300TD 311,000M Stolen. Presumed destroyed

In cold weather it helps the fuel to pass through the filter. Once the fuel temperature reaches the "cloud point", it will clog the filter and stop your engine.

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Gone to the dark side

- Jeff

Hi guys i was wandering if there was a do it yourself with pictures on the fuel thermostat.
I had mine out but i am now having the problem that it is very hard for me to push the white cap in far enough to get the ring back on,i have nifty snap ring plyers and all but i cant seem to be able to insert the cap back on deep enough.
Does anyone have any tips on how to do this?
I dont think i am missing any parts,i see a spring a small washer atop the spring that sits inside the white cap and the cap.
Help would be greatly appreciated