check the vacuum line to fuel pressure regulator on fuel rail at the back of engine to see if broken or has fuel in it.your regulator may be byby.

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David S Poole
European Performance
Dallas, TX
4696880422

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
http://www.w108.org/gallery/albums/A...1159.thumb.jpg

father bob (Padre?),
had a 1993 300E 2.8 with a very very similar issue. Turned out to be a common problem component according to the dealer. A bad overvoltage protection relay starting to go bad, showing up as intermittent starting problems when engine hot. On a cool morning, no problem starting. Hot engine in the afternoon, rough start or no start at all, just cranking. Again, intermittent. After a new OVP relay, all was well.

What purpose does that vac line serve? I thought it was just there in case the fpr was faulty and leaking fuel? I'm asking because mine is unhooked with the hole plugged on the large tube going to the air cleaner for "technical" reasons.

The FPR is connected to the manifold vacuum, it pulls back the FPR at idle for lower pressure in the rail and goes to full regulated pressure at the rail with no vacuum aka wide open throttle.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)

OK, the beast died in a 113F Kroger parking lot. Just would never crank. Even with ether assist. Towed home, tried in the morning, and presto! Started in first click of key.

I drove it to the mechanic. (He loves puzzles!) I asked him about the vacuum regulator and the small hard tube to the rubber valve cover/air cleaner tube. He said that this does not pull vacuum, but is there to vent raw gasoline in case the vacuum regulator fails.

We have heat-index in the 100s this week. The mechanic has the car.
Time will tell, and I hope to post a success story.

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BnObob (for the fallen flag railroad.)
Artic "Snow" White 1989 300E, 124.030
w/ M103 engine, and 106K orig miles.