Fuel Problem with my 1987 Mercedes 560SEC
will start a little rough sometimes but after driving a mile starts to loose speed and drop RPM, Vacuum starts to red line gas gauge starts moving erratically, starts loosing speed/power (specially in a grade) until it chokes to a stop after a couple a minutes (5-10) I restart and the cycle repeats!! I have changed fuel filter and both fuel pumps.
ok- you have a car that is 1) almost 30 years old- 2) a very expensive car when it was new, capable of 150 mph and engineered in a complex way- 3) a Mercedes that needs an experienced MB mechanic to keep it running right- SO, my guess is that it needs a major service, performed by a certified MB mechanic- sorry I can't help you beyond that- but you want to be livin' large without paying for it- good luck
Try jumping the fuel pump relay 87 and 30 see if it persists also sounds like fuel pump is giving out make sure you have steong battery