Check for corrosion
Bad ground or bad connection at the pump terminal. You have checked the only fuse there is to check.
Bad ground or bad connection at the pump terminal. You have checked the only fuse there is to check.
190E Fuel Pump Relay/Electrical Problem
Please help if you can.
I have a 1986 190E, 8V that will not start.
When I turn the key the fuel pump no longer makes a sound before the engine starts, which made me suspect a bad fuel pump.
I tested the fuel pump and it is not receiving any power when the ignition is turned on, so the pump is not the problem.
Next I looked at the Fuel Pump Relay, there were no obvious signs of carbon build up or corrosion on the relay, I then jumped the 87 & 30 terminals which should force power to the fuel pump, and still got no power to the fuel pump.
I also inspected the Over Voltage Relay, and it also appears to have no problems.
Question, what do I look at next?
Is there a fuse that could be preventing power from reaching the relay; is there a main power source that I can check, is there a common ground wire that would cause this problem?
All help is appreciated.
Todd
I have a 1986 190E, 8V that will not start.
When I turn the key the fuel pump no longer makes a sound before the engine starts, which made me suspect a bad fuel pump.
I tested the fuel pump and it is not receiving any power when the ignition is turned on, so the pump is not the problem.
Next I looked at the Fuel Pump Relay, there were no obvious signs of carbon build up or corrosion on the relay, I then jumped the 87 & 30 terminals which should force power to the fuel pump, and still got no power to the fuel pump.
I also inspected the Over Voltage Relay, and it also appears to have no problems.
Question, what do I look at next?
Is there a fuse that could be preventing power from reaching the relay; is there a main power source that I can check, is there a common ground wire that would cause this problem?
All help is appreciated.
Todd
1 - 6 of 6 Posts
Hey Todd, did you ever get to the bottom of this? I have exactly the same problem :/Please help if you can.
I have a 1986 190E, 8V that will not start.
When I turn the key the fuel pump no longer makes a sound before the engine starts, which made me suspect a bad fuel pump.
I tested the fuel pump and it is not receiving any power when the ignition is turned on, so the pump is not the problem.
Next I looked at the Fuel Pump Relay, there were no obvious signs of carbon build up or corrosion on the relay, I then jumped the 87 & 30 terminals which should force power to the fuel pump, and still got no power to the fuel pump.
I also inspected the Over Voltage Relay, and it also appears to have no problems.
Question, what do I look at next?
Is there a fuse that could be preventing power from reaching the relay; is there a main power source that I can check, is there a common ground wire that would cause this problem?
All help is appreciated.
Todd
18 year ago post
So my guess is that he must have gotten to the bottom of it by now18 year ago post
Angus have you tried the joining up the pins on the relay ?
1 - 6 of 6 Posts
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