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Old 02-22-2007, 04:30 PM
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89 300e need fuel pressure test specs/info

I was wondering if someone with the workshop manual CD's or some other reference source specifically for a 1989 300e w124 m103 (mine is a California model if that makes a difference) would be kind enough to share the following info for a fuel pressure test....
1) Fuel distributor system pressure. The Bosch Fuel Injection book by Probst mentions 80psi (5.5 bar) for what appears to be a KE system on a VW/Audi, but also says that some systems went to 91 psi (6.3 bar) in 1988. And as you probably know if you're reading this, the 1989 Mercedes 300e is a KE-III system.
2) Fuel distributor lower chamber warm and cold pressures (if they actually list those numbers, or is it just a difference from system pressure of .4 bar and 1.0 bar respectively?).
3) Which pin #'s need to be jumped in the fuel pump relay socket in order to keep the fuel pump running during the fuel pressure test (pin #'s 7 & 8 perhaps?) The fuel pump relay does not have a test socket that you can drop a fuse into to run the pump like the KE system highlighted in Probst's book.
Thanks in advance, and thanks to those who have posted in years prior with helpful info regarding Jetronic systems.
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Old 02-25-2007, 07:13 PM
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Old 02-27-2007, 12:18 PM
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pins #87 & 30, thank you David
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