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Car Forum / Mercedes-Benz Cars / October 2006intermitant fault on 300sl 1989
can any one help? i have a 1989 300sl which starts and runs for 1 or 2 seconds,then cuts out.the problem seems to be no power to the fuel pump . if power is applied directly to fuel pump then there is no problem.this is an intermitant problem and is driving me nuts! i live in zimbabwe and can not find a mechanic to help. The fuel pump is powered by a relay - a switch. Relays get "tired" and after 16 or 17 years it's time for your relay to become intermittent. So a "fuel pump relay" is what's needed, IMHO. For future reference, there's also an "over voltage protection relay" which creates strange engine behavior when it fails. It has a fuse on its top. Hope this solves the car's problem. Agreed I would also place one guess on the fuel pump relay, but not on the OVP relay, since this has nothing to do with power to the fuel pump. The fuel pump relay will shut, if no RPM signal occurs for 1 second. So this indicates, that either the rpm signal is not received from the electronic ignition unit, or the circuit inside the fuel pump relay does not detect it (could be a bad connection in the socket to the fuel pump relay). > Agreed thanks so much for your reply, but could you please tell me where these things are located? We can diagnose the problem with the system but WE don't know where this stuff is located on every model since we're not in the repair shop business. Suggest you look where the car's fuses are kept also around the battery area. Post again with the question "'89 300SL - Where is fuel pump relay located?" > The fuel pump is powered by a relay - a switch. Relays get "tired" and > after 16 or 17 years it's time for your relay to become intermittent. [quoted text clipped - 6 lines] > >thanks so much for your reply.is it easy to explain where the "fuel pump relay" is situated?. i forgot to mention that i do not have a manual that is very explicit. > i forgot to mention that i do not have a manual that is very explicit. Hm, don't know if this applies to you: http://www.benzworld.org/forums/r129-sl-class/1255861-90-300sl-fuel-pump-relay-l ocation.html ws thanks ws.but the 300sl i have is a 1989 which is the last of the old models.but an interesting site .will keep trying to find it! lynne |
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