Quote:
Originally Posted by cornemuse
I have an '83 300CD T. I've never run it out of fuel, (yet) mainly 'cause ever since I got it, the primer pump has not worked. (fear of running out = anal issue!) The original was old (?) style which leaked as soon as it was unscrewed. I replaced it with a spring loaded (the black handled one). It still never worked "at all". I have the MB 'CD' shop manual and have everything installed properly, but no cigar.
Any ideas or suggestions??
(I have to print pages from the CD in order to see & understand the pics, for $100 bucks+ its a poor setup, but I could'nt find actual books, but printed images are tolerable)
-corne-
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Not sure when you bought your CD Set but I bought mine from Mercedes Manuals at $53 in 2007 and that was already too much because I could have got it from Mercedes for about $27 total cost.
However, if you bought it a long time ago they used to cost more.
Mine ran fine on the 32 Bit windows XP but does not on on the the 62 bit Windows 7.
On the CD intself is some of the stuff you need to run it properly. You need some version of Adobe Acrobat or something like Foxit to view them on the Screen
I have not read of the particular problem you are having.
And, even stranger you have not indicated any other performence problems that might help narrow it down so I am going to ask some questions.
If you were to loosen and disconnect the Fuel Return Hose (a.k.a. Cigar Hose) from where it connects to the Tubing on the Fender Well and Pump does Fuel come out? If it does the Hand Primer is working.
If Fuel does not come out you are left with some large Air leak or obstruction and that is not likely becasue it would have caused some issues when the Car is running.
The Fuel Supply Lift Pump has 2 Valves in it. I have seen the little Valve Springs rust through or Brake and I guess it is possible for someone to assemble a valve wrong or for a Valve to stick or not seat well.
But, if there is some issue with one of more of the Valves is kind of odd you have no performanc issues.
Unfotunately the Lift Pump Valve Kit does not have the 5mm O-ring that also should be changed in the Lift Pump.
Lift Pump Kit Hunter 617.951-952
http://www.peachparts.com/shopforum/showthread.php?t=183451
Lift Pump, Fuel Supply Pump about sanding the Valves has the small O-ring size
http://www.peachparts.com/shopforum/showthread.php?t=266857&highlight=lift+pump+kit
Lift Pump taken apart
http://www.peachparts.com/shopforum/showthread.php?t=249082&highlight=0009934801&page=3
Lift/FUEL SUPPLY PUMP TINY o-ring
Bosch lists now 2 440 210 002 (MB 010 997 86 48) as replacement to the original black(perbunan?). And yes,the replacement is Viton.
The 5mmŲ x 1.50mmŲ 'O' ring is located in a groove in this bore and prevents engine oil in the IP from being sucked into the fuel re-circulation circuit. In most cases this O-ring has either hardened and broken up or completely disappeared.
http://www.peachparts.com/shopforum/showthread.php?t=261822
Fuel Supply/Lift Pump O-ring stuff- has links to 2 sets of pics of old and NEWER LIFT PUMP
http://www.peachparts.com/shopforum/showthread.php?p=2559787#post2559787
Sorry My notes on the lift pump stuff are badly organized. I was trying to find one of the threads with pics.
Under the Hand Primer but on the bottom side of the Lift Pump is a Plug, Crush Washer and in this order the Valve Spring and the T part of the Valve faces upwards.
On the top side of the Lift Pump under where the Plastic Fuel Line going to the Spin-on Fuel filter is; is a fitting that when unscrewed has a Crush Wasner and in order the Valve Spring and the Valve. In this case the T part of the Valve goes downwards.