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  #1  
Old 11-13-2001, 10:55 AM
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85 500SEL Surges on fuel demand and on highway

Sometimes there is noise from the fuel pump, sometimes not. I used compressed air to back blow the lines with limited success.
It idles fairly smooth for 225,000 miles and runs fine otherwise, except for this problem. Is there a strainer in the fuel tank? What else should I check? I looked for a vacuum leak and did not find one.
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  #2  
Old 11-13-2001, 12:06 PM
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There is a small strainer at the fuel distributor where the fuel line connects. It is integrated into the fitting in the fuel distributor. You might replace it since you have so many miles on the car.
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  #3  
Old 11-13-2001, 12:18 PM
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Checked that strainer, there is no clog there

Is there any other strainers in the system or could something be clogging the outlet at the tank?
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  #4  
Old 11-13-2001, 12:45 PM
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Not aware of any others. Disconnect the fuel supply line at the distributor and measure the flow. That should tell you if there is a problem. Could be anything, pumps, filter, crud in the tank.
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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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  #5  
Old 11-13-2001, 12:49 PM
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Thanks again...last question (maybe)

Fuel pump and filter are new. If it is crud in the tank, how hard is that to get at? Does it take a tank removal or can you clean it while it is installed. I am doing the work on it.
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  #6  
Old 11-13-2001, 05:36 PM
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I doubt that the tank needs cleaning. Im not sure I fully understand the symptoms. Can you be more specific as to that the problem seems to be. I understood from your first post that you think it is starved for fuel. If you are getting good pressure and flow from the fuel system then I would look elseware. Before I started fixing things that may not be broke I would get a good understanding of what the problems are. Can you elaborate a bit?

Im not sure what surging on fuel demand is.
__________________
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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  #7  
Old 11-13-2001, 06:20 PM
MIKE FREEMAN
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85 500SEL surges

Yes there is another fuel screen,it is located in the bottom of the fuel tank where the fuel supply line attaches.
If the pump is noisy replace it before it leaves you stranded!
MF
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