I have a 92 300SD, recently I started to smell diesel fuel fumes inside the cabin. I look around the fuel lines on the injectors (hard lines and return lines), lines are conpleted dry. Also around the the IP and filter. Every thing looks ok, there was a small wet spot at the bottom of the plastic fuel filter, there is a part that I don't know what it is (pic is below) I clean and check all the lines around it for cracks, every thing was in good shape. I need to follow the line from the filter to the gas tank. Can I see the gas tank from the trunk by removing the hasrd carpet? I don't want to remove stuff if I don't need to. Thank you guys again.

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I had a similar problem, but with exhaust fumes. Turned out I had an exhaust leak after the turbo allowing fumes to be pulled in by my fan.

Are you sure it is fuel smell and not exhaust smell.

__________________
----Adam

1985 300SD 322,000

That aluminum unit with the plastic elbow is the fuel pre-heater.
It is common for the O-ring and plastic elbow to go bad, sometimes corrosion eats the housing where the O-ring seals.

MB# 601 070 02 82

6010700282 Fuel Thermostat
6010700282 Fuel Thermostat

Diesel fuel thermostat repair kit, huge application list
OM601, 602. 603 Diesel fuel thermostat REBUILD parts list





have a great day

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Had a similar problem...turned out to be a fuel return line (near injectors...look for fuel seepage). I replaced them all...no more fuel smell!

I see you already checked those lines....sorry and good luck.

It is doubtful that the tank is leaking in the trunk.
The fuel hoses come off the bottom of the tank, under the car.

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mine smells too. Good info to start looking for!!
Thanks guys!

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2006 Jetta TDI DSG 320k miles
1997 Ford F150 325k miles 4.2L V6 "Work Truck"
2008 Tundra 225k miles 5.7L
1982 240D.....sold
1984 300D...Totaled OUCH!
1985 300D Turbo 222k miles "Dos" sold to 79Mercy
1986 300SDL 98K miles "The Beater"....sold
1987 190E 2.3 16v Euro spec 115K miles....sold

I also replace the accordion pipe connector. Exhaust problem has been fix. now is a fuel smell. Thank you anyways

Excellent, I will look forward to get the kit and take care the part of the problem.

All I need to do sis raise the car and fallow the lines to see the conditions of the joints and if any leak.

Its worth having a look around the fuel tank filler. If the rubber seal (65 in Roy's diagram) is loose it will cause the smell.

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1967 230-6 auto parts car. rust bucket.
1980 300D now parts car 800k miles
1984 300D 500k miles
1987 250td 160k miles English import
2001 jeep turbo diesel 130k miles
1998 jeep tdi ~ followed me home. Needs a turbo.
1968 Ford F750 truck. 6-354 diesel conversion.
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I've noticed some moisture down there as well. I intend to spray the whole area down with brake parts cleaner before diving in. This will isolate components that are just getting the runoff but it should reveal the real source of the problem.

I am inclined to believe that the hoses should be replaced first before digging into the pre-heater. My 92 looks to have original hoses and those degrade over time due to fuel exposure.

steve a

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Steve A
92 W140 OM603
97 VW Jetta TDI
90 Passat variant TDI 6 speed MT
94 Chevy K1500 6.5TD
05 E320 CDI
+ others

I did remove all hoses around pre-heater, they been replace, but I notice some moisture inside the lock ring. So I think I will get the
repair kit, hope the smell goes away. I will keep you post it on the outcome.