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#1
08-31-2006, 03:45 PM
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300E Fuel problems
Greeting,
I've been having some problems with fuel delivery on my 1989 300E with 171,000 miles. During initial startup, the engine seems to only run on a few cylinders, then after a few seconds the rest start firing. Sometimes while motoring down the road the engine would just stop, rendering me stranded. I would try restarting the engine right away without success. After a few minutes I tried again and it would start. This has happened several times over the last 5 months. Three weeks ago I couldn't get it started at all. I've looked at and removed the fuel pumps and the accumulator for inspection and testing. The pumps seemed to be pumping fuel, so I reassembled. After turning the ignition switch, I could hear the pumps working to pressurize the system. The engine started like nothing was wrong. This past week I was left stranded again. I removed the aircleaner and cracked the fuel line in and out of the injection pump. Initially I had some residual pressure, but then nothing. I tried to start it without any fuel delivery from the pumps. 1. Why did Mercedes need two fuel pumps on this model? 2. Will I need to replace both pumps? Not excited to spend $500+ for pumps. Thanks for any help or suggestions. Razor 
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#2
08-31-2006, 03:57 PM
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The fuel pump relay has been known to cause a lot of trouble for these models. Do a search. There have been many discussions about this problem.
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I got too many cars!! Insurance eats me alive. Dave 78 Corvette Stingray - 3k 82 242 Turbo Volvo - Manual - 270k 86 300e 5 speed manual - 210k 87 420sel - 240k 89 560sl - 78k 91 420sel - 205k 91 560sel - 85k 94 GMC Suburban - 90k 97 Harley Davidson Heritage Softail - 25k 00 GMC Silverado 1 ton 30k
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#3
08-31-2006, 04:03 PM
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pumps 103 each.. free shipping... i would definetly consider getting a relay... we always keep a spare.. relay, not pump...
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1989 300ce 129k ( facelifted front,updated tail lights, lowered suspension,bilstein sports, lorinser front spoiler, MOMO steering wheel, remus exhaust,stainless steel brake lines). (Gone) 1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus 1994 e320 Cabriolet 108k  1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it [/SIGPIC]
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