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#1
12-25-2007, 05:08 PM
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help with my '84 300sd
I am the original owner of a 300SD, 1984. Lately, on the highway after cruising fine at 75-80 mph for several miles, my power starts to slow and i cannot get above 70. then an hour later, it slows to 45-50.
Sure makes all the other travelers angry. after stopping and restarting, it does fine for a few minutes and then starts to regress all over again. Any thoughts on what this could be? I am female and in a new city and am afraid of getting taken at the mechanic. thanks 
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#2
12-25-2007, 05:19 PM
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Most likely diesel filters in engine compartment. There are 2 on drivers side. One is at an angle, this is prefilter, the other one looks like an oil filter, but has bolt in center to hold it in place. I'd change both, and happy motoring. Welcome to group. Good luck.
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#3
12-25-2007, 05:41 PM
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These are the filters you need. Click PARTS on this sites homepage.
PART NUMBER SEARCH RESULTS WITH PRICES Vehicle 1984 Mercedes Benz 300SD Part: Fuel Filter Note: Bolt-on Optional with 001 092 05 01. E1000-11961 Fuel Filter Mahle IN STOCK E1000-31912 Fuel Filter Bosch IN STOCK PART NUMBER SEARCH RESULTS WITH PRICES Vehicle 1984 Mercedes Benz 300SD Part: Fuel Filter Note: Clear inline 90 degree angle Mercedes OE supplier with brass insert reinforcement. E1000-11999 Fuel Filter Brass Insert Germany IN STOCK E1000-29273 Fuel Filter Clear Bosch IN STOCK You can do search if this link does not work. Pick up a few of the prefilters. Keep couple in glove box. Last edited by whunter; 12-25-2007 at 10:23 PM.
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#6
12-25-2007, 05:49 PM
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I agree, sounds like a fuel problem. My hand in the pic is holding the primary filter, the black thing is the secondary filter, it screws on, just like an oil filter on gassers. You'll need to loosen that large bolt on top, 22mm, or maybe you can get an adjustable wrench on it, don't need a lot of torque.
Local auto part stores should have both of them. If you change out the filters, you'll need to prime the system with the pump located on the engine. I have the new black pumps installed, yours may be white with a knurled handle, unscrew that, pump, re-tighten when done. Also fill up the secondary filter with fuel of some sort, injector cleaner will work just fine, at the local store also. Loosen the smaller of the two bolts on top of the fuel filter housing, a 17mm, I think, when pumping the primer, this lets the air escape, tighten back down after fuel comes out.
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83 SD 84 CD Last edited by toomany MBZ; 12-25-2007 at 05:51 PM. Reason: more info
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#7
12-25-2007, 07:43 PM
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Quote:
 John
__________________
Certified Registered Nurse Anesthetist (CRNA) 2002 F250 powerstroke with Plantdrive WVO conversion 1983 300SD 190K miles ,sold 2006 E320 CDI
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#9
12-25-2007, 09:17 PM
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When you remove the fuel cap do tou get a sound of vacumed air (whooosh)? If you do clean the tank vent line under the driver's side wheel well. If not then do the filters and check back as there are some other things that could be done like banjo fittings etc. Good luck.
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If it ain't broke take it apart and find out why.  1983 300SD, 4 speed 1994 C280 1987 300TD wagon 1996 HD Road King Ride in Peace Eric Peterson, Harley of Macon
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#11
12-25-2007, 10:48 PM
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Geez Roy, now that the poor woman with one post has her head spinning, can we again remind her to do the most simple, AND most common cause of this issue, and replace her primary and secondary fuel filters. All this other stuff listed in numerous posts above can be done next......
__________________
Jimmy L. '05 Acura TL 6MT 2001 ML430 My Spare Gone: '95 E300 188K "Batmobile" Texas Unfriendly Black '85 300TD 235K "The Wagon" Texas Friendly White '80 240D 154K "China"  Scar engine installed'81 300TD 240K "Smash" '80 240D 230K "The Squash" '81 240D 293K"Scar" Rear ended harder than Elton John
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#12
12-25-2007, 10:54 PM
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Replace the
 fuel filters......
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#13
12-25-2007, 11:45 PM
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The filters are probably your problem. If you are willing to get your hands dirty and have some basic tools, this is a 10 minute job.
If you take it to a shop. You should spend maybe $30 on filters and 1/2 hour labor.
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'85 300SD (formerly california emissions) '08 Chevy Tahoe '93 Ducati 900 SS '79 Kawasaki KZ 650 '86 Kawasaki KX 250 '88 Kawasaki KDX200 '71 Hodaka Ace 100 '72 Triumph T100R
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#14
12-26-2007, 12:07 PM
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Yes
Quote:
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#15
12-26-2007, 12:23 PM
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this sounds like the primary filter, because when you stop for a while, it returns to normal.
however, it could also be the fuel tank itself. simple thing to do is get a flashlight and look at the fuel filter closest to the firewall of the car. it should be transparent and you should be able to see the element, it is supposed to be white, so if there is a lot of blackish gunk on it, you should be able to see it clearly. if there is only a little bit of gunk on the clear filter element, just move to the fuel tank cap. after a long drive, immediately go take the fuel cap off, and see if you hear a whoosh of air entering the tank. if you do, there is a bell shaped device above your passanger's rear tire, clean it off, it may have gotten covered with mud recently. this can actually collapse your fuel tank making it so it only holds 10 or so gallons instead of the normal 20 ish gallons.
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!!  1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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