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

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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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]

Thanks for the info on the relay. I knew that there was one in the system and planned to check it out before proceeding with the purchase of new pump.

Thanks,
Dan