No Start, Erratic Fuel Pump - PeachParts Mercedes-Benz Forum

tvpierce · #1 01-20-2011, 05:42 PM

'92 201 w/ 102 engine.

Car is driven 66 miles daily for my commute without incident. The engine will occasionally stall within the first 60 seconds of operation when it's very cold. But this has only happened twice -- and most recently about a week ago.

Last night, the car sat for about an hour while I was at a doctor's appointment. I came out and it started fine. Drove for about 100 yards, then just stalled and wouldn't re-start. The fuel pump normally cycles for 1-2 seconds prior to start up. During the no-start situation, it would cycle 1-2 seconds, three consecutive times. It did this repeatedly. I let it sit for about 15 minutes, then upon turning the key, the pump cycled once and the engine started.

I drove home without incident. Even stopped along the way... let it sit for about 20 minutes, and it restarted fine.

The next morning (today) it started fine for the 33 mile commute to work. This afternoon, I had to run out to pick up a part. The engine started fine when I left work. I drove about a quarter of a mile, and went in to pick up my part (took about 15 minutes). Came out, and no start again. And once again, the pump was cycling 3 consecutive times.

Let it sit for 10 - 15 minutes... the pump cycled normally, and the engine started.

The one commonality I see is that both times it was a cold re-start. But the pump cycling consecutively seems to me to indicate something other than cold carburation.

Any thoughts?

Thanks in advance.