My SLK 230 ran fine until last fall(2018). Came home and a week later tried to start the car and it turned over but would not run. Weather was already cold with snow on the ground so I disconnected the battery negative terminal and the car sat until this week(June 6,2019). Reconnected battery and the car cranked fine but did not start. To check if the problem was spark or fuel I sprayed the intake with a bit if starting fluid. The car started and ran for a few seconds. Now I know that its fuel. Have read the thread on the K-40 relay, but not sure that it was the problem. I did remove it and opened it up to check the board and it looks ready good. No corrosion and no areas of heat. Is there a way to check the fuel pump without removing the cover on the underside? Any help would be really appreciated.