[W126 Coupe] 1988 560 SEC loss of power

[Iain Gunn]

Sorry, coming onto this post late, but my 2 cents.
You can also take them apart, the old ones and re-solder all the pins inside, fixed a few this way. Once while waiting for a relay I made up a jumper with on off switch, threaded it though into the drivers side, and could shut the pumps off.
I also got a fuel pressure checker and checked the fuel pressure and the accumulator hold pressure. Also put the large gauge against the windshield and checked pressure when driving.
Two items that I have found weird and fixed problems, may not apply here. 
One- My problem was one of the precats broke internally and dropped all the powder into the cat and plugged it up. Found this by cutting 2, 1-1/2 holes in the exhaust prior to cats. Drastic, but gained 100 HP.
Two- Found a collapsed fuel line in someone else's. The rubber fuel lines are laminated and the inner part would collapse and shut off or restrict the fuel line, acted like a baffle, as fuel flowed it would collapse more. Changed all the rubber parts and problem solved. 
  ----- Original Message ----- 
  From: Henry Viveiros 
  To: 'Mercedes Coupes Mailing Lists' 
  Sent: Thursday, September 24, 2009 2:56 PM
  Subject: Re: [W126 Coupe] 1988 560 SEC loss of power


  When I had  fuel pump relay problem (the engine would suddenly just stop running) I found that just wiggling it around would "fix" the problem. When I determined that it was the problem, I removed the relay and cleaned the pins and sockets. It has been fine for a year now.



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