72 mercedes 280SE 4.5

[noel.brownell]

Just purchased. I can't find a diagram for the fuse box. The blinkers do not work and the original stereo's max volume is too low to really hear. Also when I push the button for the moon roof it makes a sound like it tries to open but no movement occurs. Any suggestions?

[Jengasan]

I take it you're talking about the bakelite fuse box in the passenger compartment ? My car is a Eurospec 3.5 but it's stilla D-Jet and these should be identical.

There are 12 fuses, number 1 is nearest the firewall. they are :

1 - Parking light,clock, pass signal light, map light, glove box light, dome light, trunk light, hazard warning light.

2 - Horn, windshield wiper and washer, cigar lighter

3 - Auto transmission timing, fan coupling.

4 - Fuel pump

5 - Turn signal indicator, back up lights, fuel guage, speed increasing solenoid, stop lights, warning light for handbrake, valve unit and compressed air.

6 - Heater blower, automatic starting aid

7 - Tail light right, parking light right, license plate light, dash lights

8 - Tail light left, parking light left, fog lights right and left

9 - Head light high beam right and indicator

10 - Head light high beam left

11 - Low beam right

12 - Low beam left

Obvioulsy some of these are dependant on options and I think the moonroof fuses are located elsewhere.....have fun

J

[Jengasan]

Having just read the hand book - the 25A fuse for the sun/moonroof is in the engine compartment as are other fuses for the Heated Rear Window, Electric window lifts, Air con, Additional cooling fan, Automatic aerial and Radio.

Is your radio fitted with a fader by any chance ? if so fiddle with it a bit.

There is a manual/emergency procedure for operating the sun/moon roof but let me know if you need that.

J

[noel.brownell]

The car does not have a volume control like the manual describes but I am curious to what will happen when I find the fuse box under the hood. I will let you know how that turns out. Another issue I am having is the odor of fuel in the cab of the car. It gets worse when I push on the gas harder. Any ideas? Thanks again for the heads up.

Noel

[Pooka]

Sounds like you have a leak in a fuel line. Even a little one can cause a smell of gas inside the car.

Just have someone else start the car while you look into the engine compartment. You will likely not see a spray of gas, but you might notice one of the hoses or a companent getting wet. When you do just replace the leaking part or hose.

You sunroof likely needs to be lubed. The motor is in the trunk on the right hand side and there is a slot where you can insert a large flat blade screwdriver (or a special tool if you have it) and turn the motor by hand.

Sometimes, after a lot of use, the drive screw wears out in one position and you have to replace it. This is a big job in time but is not tricky. I would try opening the sunroof by hand and then lubing the tracks before I set out to replace the drive screw.

Pooka

[Tomguy]

Originally Posted by noel.brownell

Another issue I am having is the odor of fuel in the cab of the car.

DO NOT DRIVE IT! A D-Jet engine with a fuel leak is a fireball waiting to happen. Fuel leaking @ 30 PSI + Hot exhaust = goodbye to the car! Replace ALL underhood fuel lines with EFI hose, not just fuel hose (it's rated for higher pressure).

[noel.brownell]

Thanks for the great advice! I will get under the hood today and replace the fuel lines. Do you think that the fuel leak is most likely under the hood?

[Tomguy]

The most likely location of the fuel leak is under the hood, but the line from the pump to the metal fuel rail may be a candidate for replacement (with EFI line) also.

The lines you need to replace:
8 injector lines (buy 8 clamps, don't worry about an injector repair kit, just buy 8 additional fuel clamps not the worm-style, and cut EFI hose to length, cut off the old and replace).
The line from the metal fuel rail on the frame rail to the "T" by the distributor
The 2 lines from the "T" to the 2 fuel rails
The line from the fuel rail to the cold start valve
The lines from the fuel rails to the fuel pressure regulator
The line from the fuel pressure regulator to the dampener
The line from the dampener to the return metal fuel line

About 6' of EFI line should be well more than enough. If you replace all of these lines (that are probably the original, 35+ year-old braided lines) and still smell fuel, let us know! 99% chance you won't though. FYI, the braided lines can mask a fuel leak rather well because the fabric on the outside makes the fuel wick away and evaporate faster.

[magnumrick]

I just finished repairing my sunroof on my 1970 250C which is probably the same as your car. If you hear the motor running in the trunk but the roof isn't moving, either your drive motor clutch is loose or more likely the rubber coupler between the drive motor and gear box is torn. I pulled my roof completely apart so I could replace the seals and wound up replacing all the plastic glides as well. One of the glides was missing which caused a scratch in the roof. If I was ever to do it again I would order the seals, glides, and coupler before I took it all apart. The parts were not that expensive and the roof works perfectly. There is a special Mercedes spec grease that I got from my brother in law that is made specifically for the sunroof, it is almost clear.