That is right. If your fuel distributor. is original, then you need to
replace your fuel filter first. Then I would replace your fuel pressure
regulator. I am not sure on yours... on my old 380SE I had a needle on back
of my fuel distributor... that has a big nut... whole needle unit comes out
and has washers... these washers dictate the pressure level... but if yours
is original, don't change the amount of washers... clean them out and
It is possible you need to have the fuel distributor rebuilt.
I believe the EHA didn't come until mid 80'ies (the "E" models), making
the fuel injection "electronic".
Before it was just "direct fuel injection" (in contrary to carburator).
So, to 450sl:
The fuel pressure regulator provides a constant pressure input to the
The fuel distributor then provides a pressure proportional to the air
mass and distributes this pressure equally to all injectors.
Apparently the primary pressure is too low in your case. The cause
- fuel filter clogging the fuel passage
- the fuel pressure regulator regulating to a wrong pressure
- the fuel pumps not being able to provide enough pressure
Since the fuel pressure is only half of the required, It could very
well be one of the fuel pumps defective.
Guenter Scholz skrev:
I tested the fuell pressure before the pressure regulator and it is 0
should there be any pressure from the fuel pump? Its about 32 after the
regulator. All plugs are fouling with black, so its definately over
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