89 300e w124 major fuel problems

alex89_300e via CarKB.com schrieb:
> 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.
>

You get the fuel lines leak-proof only with the car up (you need thr
space tp apply the wrench) and a torque of 25 Nm. That means about 200
pound force with a 10 inch lever wrench. Its a high pressure line for a
low viscosity fluid.

--

Roland Franzius
 >> Stay informed about: 89 300e w124 major fuel problems 

On Jun 29, 3:55 am, "alex89_300e" <u44548@uwe> wrote:
> 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?

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.
 >> Stay informed about: 89 300e w124 major fuel problems 

I agree... I think you need to check the pressure... otherwise, replace the
pressure regulator.
 >> Stay informed about: 89 300e w124 major fuel problems