The vehicle sometimes experiences abrupt shutdowns.

[HomeChefPro]

1989 Mercedes-Benz 560 SEC.

Occasionally, the vehicle unexpectedly ceases operation without apparent cause.
It has occurred three times so far, with intervals of months in between.
During the first two instances, I was going downhill at a moderate incline, perhaps 30-40 mph, and I was able to restart the vehicle quickly.
On my third driving occasion, I was traveling at around 30-40 mph on a flat road when I had to halt due to an intersection. The vehicle failed to restart. I tried it three times. My passenger and an unfamiliar individual propelled the vehicle for around 100 feet, after which I attempted to restart it while it was moving, and it successfully ignited this time! I was preparing to summon a tow truck when all caution lights on the dashboard illuminated.

Is this a recognized issue? What may it be?
I previously informed my business about this, but they said that it would be difficult to locate due to its infrequency. (Indeed, you do not articulate)

[partexpat]

Greetings. The issue is likely attributable to your fuel pump relay. Merely due to its prevalence as an age-related failing.
You may use the search option to see conversations.
Refrain from discarding your old unit; having it resoldered may be a viable solution.

[FitnessFanatic]

Define "die" - does everything on the dashboard become unresponsive? All the lights illuminate, however the engine stalls.

[SkiJunkie]

I concur with Ian on my first Han encounter with an allegedly 'haunted' vehicle.

[SkiJunkie]

Wishing you success in your endeavor!

[GamingLegend]

Did you accelerate the vehicle enough to activate the secondary pump in the gearbox and effectively disengage the clutch?

[MentalistMind]

Could it be a faulty voltage regulator? They will drive Dash to madness, leaving you without any energy to begin with.

Additionally, examine your distributor cap.

[UrbanGardener]

I would further inspect the wiring at the gasoline pumps. Ensure there are no interruptions.

[BassGuitarist]

I concur with Ian and Malcolm on this matter. Replacing the fuel pressure regulator would be prudent; even if it does not resolve the problem, having a spare would be advantageous.

[EcoTraveler]

I had a consistent issue with maneuvering my SEC in and out of the garage. I have not driven the vehicle much in recent months as I am doing many engine repairs in preparation for summer.

At the time of the incident, the vehicle would continue to crank but failed to ignite. To identify the issue, I had another individual attempt to start the vehicle while I listened at the back offside for the sound of the fuel pump. During the first problem, I did not hear any hissing from the gasoline pump. All indications suggest a Fuel Pump Relay (FPR) malfunction. I purchased an inexpensive fuel pressure regulator on AliExpress for $24, including delivery. This was intended for troubleshooting. Upon the installation of the updated FPR, the beginning problem was resolved.

A low-cost FPR is not a definitive solution; rather, it facilitates troubleshooting and provides an extra component to take aboard in case of unforeseen issues while traveling. It is advisable to clean the contacts on the original FPR upon removal, since accumulated debris may lead to occasional problems.

I have visually examined the original FPR and found no apparent damaged solder connections. I have conducted continuity testing and found no apparent difficulties. I will, when I have the time and patience, resolder the joints in the original FPR and conduct a test.

[VRVoyager]

I had a similar situation, trusted someone...

I also purchased one from AliExpress.

My initial repair and installation, completed a couple of years ago, is exceptional. I own a recognized spare tire located in the little compartment between the rear seat cushions on both vehicles.