Join Date: Jun 2012
Location: Norfolk England
Vehicle: SLK 200 R170
Other Toys: Triumph Tiger 1050, Teal type 35
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Fuel pump fault
I have a 2003 200K with 80,000 miles.
I have searched and forgive me if I have missed any previous posts.
I am having severe power loss intermittently when the car gets hot. My immediate feeling is that the engine is starved of fuel. I have done the relay solder check and made good suspect joints.
The problem occurs when the engine is at max temp, i.e. when travelling in slow traffic and the fuel tank is 1/4 full.
I have also noticed that when the power loss happens the fuel pump is noisy and the noise sounds as if the pump is changing speed.
I have read elsewhere that the pump is cooled with the fuel in the tank and I can see that with a small amount of fuel in the tank, the exhaust hot under the car and little or no airflow under the car, the return fuel hot from the engine the heat can soon build in the tank.
I suspect if the pump is on it's way out the heat could cause it to partly seize or run slow. Has any one else had pump problems?