Date registered: Nov 2013
Vehicle: 1986 Mercedes Benz 300E
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The infamous Fuel Relay 86' 300E
I've had trouble with this in the past and posts from this site have beed very helpful and I thank the creators and members. Last year I was experiencing intermittent 'no starts' let is sit for a few hours and Frank (car) would crank right up no problems. I changed the fuel pump, filter, and relay. The replacement pump is significantly smaller than the oem. After a long drive you can hear the fuel pump srtaining. Two days ago after a cold start Frank gave out and stalled after only making it down the street. He never came back after letting him sit this time. I noticed that the fuel pump was not coming on. I followed jumping instructions found here and bridged the two pins on the relay however now the fuel pump will not cut off unless I remove the relay... My questions to highly educated members..
1) Is the source of my problem the relay itself or the connection wiring?
This is the second relay I have installed. It's the same problem as before only worse and the old module does not get Frank to start. Before the problem was only intermittent. Now he will not start.
2) Do I need to replace the fuel pump with the correct size unit?
3) If all else fails how do I bypass the relay all together and is that a smart and safe thing to do?
Again I have not had this issue all year. However it occurred on the first freezing day of the year. Maybe this is also a factor.