Hi I have an 89 300e that refuses to start. A while back one of the fuel
pumps blew a hole in its side so I replaced it along with the fuel filter and
all the crush washers for everything in the assembly. Now when I try to start
it, it just turns over and does not even try to start. It leaks lots of fuel
from every single one of the fittings, both fuel pumps, fuel filter, fuel
accumulator, it all leaks. I am out of ideas. There is fuel in the return
line so it's getting through the lines; I don't understand how it could build
up that kind of pressure. Any ideas?
How could it possibly leak if you used new crush washers? Overtightening
will cause leaking as it deformed the surface... Are you positive you did
install all the washers? Fuel pump connection has two crush washers per
bolt... same for filter too on eash side. There is no surface where the bolt
or any component is without a washer in between.
Yes I am sure I replaced all of the crush washers. I also know they were not
overtightened because I only used a wrench and my hands to hold the assembly.
I doubt I could have possibly applied that much force to it that way. Also,
when I first try to start the car it does not leak, but then as pressure
builds up and more and more connections start leaking faster and faster the
more I try to start it.
Message posted via CarKB.com
Fuel pressure regulator opens at a certain pressure thereby limiting
(keeping constant) the fuel pressure. I don't remember the value for
the 103 engine, but I belive it is some 4 bars.
If fuel pressure regulator is stuck, the pressure will keep building
up until the internal overpressure valves of the fuel pumps open. And
that is at 6 bars+ each, 12 bars+ in total.
I think you should look there. That also explains why your fuel pump
blew in the first place.
And incorrect fuel pressure will cause incorrect fuel mixture
explaning the no start.
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