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Car Forum / Mercedes-Benz Cars / June 200889 300e w124 major fuel problems
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. 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.  SignatureRoland Franzius > 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 [quoted text clipped - 4 lines] > 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. I agree... I think you need to check the pressure... otherwise, replace the pressure regulator. |
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