Mercedes Repair Questions? Ask a Mechanic for Answers ASAP
Hi, have you tested for spark? Will it run on ether?
I know the car, do you mean no, it won't run on ether?
That's fine but what you are saying doesn't make sense. It would be nice to know that it runs on ether so we can focus on just the fuel system. How are you testing to see if the new relay works? Are you cranking the motor while someone checks to see if the pumps are running?
Looks like I lost you. I'll check back in the AM if you want my help with this.
You are replying as if you don't think I know the car. I grew up working on these cars. Your diagnosis is flawed because you don't know if it runs on ether. The fact that it is fuel injected has nothing to do with spraying ether. The fuel pumps only run for 2 seconds when turning the key on. You need to crank the motor to see if the pumps are running with the new relay. Since it doesn't run when you bypass the relay and according to you the car has good spark the only possibility is there is no fuel in the tank or one of the pumps is bad or neither of your relays are bad because you have not checked them while cranking the motor and the actual problem is a mechanical fault with the engine such as a jumped timing chain. If you knew that it ran on ether it would determine the direction of the diagnosis.