Please bare with me. I have had several new BMW's but am new to MB. I just picked up an 84 500sl. When cold the car starts right away but will stall within 8-10 seconds. Depressing the accelerator will cause it to stall immediately. After maybe 10 retries the car will run and once warm will has no hesitation and sounds strong. I have noticed a leak on the rear passenger side of the car from what looks to me to be an electric fuel pump. I'm just getting started with these cars so any help available would be greatly appreciated.