fuelproblem??? Mercedes 560 SEL shuts down after starting while idling, sometimes while driving

Hunce45
0

Asked by Hunce45 Oct 12, 2010 at 11:47 AM about the 1991 Mercedes-Benz 560-Class 4 Dr 560SEL Sedan

Question type: Maintenance & Repair

My 560 SEL sometimes shuts off after starting, or shuts off while driving.  If it shuts off while driving, the yellow indicator light to the left of the fuel gauge for the reserve tank use comes on, but the fuel tank is not low (happens when full and not in reserve tank). The car restarts, runs for several seconds and shuts off again.  This cycle is repeated several times and then it stays running and you're on your way until it happens again.  Makes driving it completely unpredictable and undependable.  I replaced the fuel filter, spark plugs, wires, distributor cap and rotor....it still happens...Any ideas on what to do next?

7 Answers

Sailor
10

I have been experiencing a similar problem on my 1990 560 SEL. After I run for awhile (25 miles or so), the engine will suddenly lose power and stall. I have to pull over, put in park, and restart - which it does without problem. Going down busier roads, I purposely will be in the right hand lane as it will happen intermittently. Seems to run fine otherwise. Fuel is good. Spark must be good. Air is good. I paid $30 for an on-line answer and the guy told me it was a faulty crankshaft position sensor. Ordered that part and the local garage guy couldn't fine where to put it in. Talked to another guy who works on Mercedes and he thought that wouldn't be the problem but might be more relay related. I think he meant fuel related. But I don't why a relay would "behave" again when I can restart moments after it might have overheated. Returned the sensor. I ordered a manual to try to do more troubleshooting on my own but due to the paucity of responses to this problem - I wonder if it is unique to age/mileage and if it is limited to a declining population of models. My car has about 179,000 miles and I had plugs, wires, distributor, fuel filter, air filter, all changed out in a major service several thousand miles ago. Anybody got any ideas?

papa
Not Active

it has a fuel shut off switch in the trunk,it may be going bad,have it replaced.

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Sailor
10

My problem was the fuel pumps. One was bad and the other was on its way out.

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nifty_car
10

My '89 560 SEL had problem starting when hot. It would start again after sitting for a while. I took it to a Mercedes mechanic who put in a new fuel pump relay which solved my problem. W.T.

1 out of 1 people think this is helpful.
stevesdb
0

Fuel Pump Relay is most likely and most common cause. So much so that I carry a spare in the trunk ! Same is true for 500SEL series (had one of those also)

johnatjerrys
20

There are a multitude of possibilities. The most common issues dealing with stalling on these vehicles is fuel related. But you have to correctly determine what isn't working when it happens. Like this 1986 420SEL I'm working on... This car cranks & runs fine, may run for an hour or maybe only 15 minutes. When the problem occurs, it behaves as if it is running out of fuel... So a fuel psi guage was installed to determine if fuel psi was correct. The guage remained at 98 psi throughout the stalling out process, then when the engine was completely dead, the fuel psi dropped to 45 psi, which is normal. Thus proving that electrically the fuel system on this car in not failing (which includes fuel cut off switches, relays, pumps etc...) All must be well with the electrical/fuel related components. So the engine will start right back up & run for an unpredicted amount of time then it happens again. Most likely cause of failure (since I'm NOT loosing spark either) are the o-rings inside the fuel distributor going bad. This part is located right on top of the engine under the air filter housing, has all the fuel lines running to it. This component can be removed, taken apart, inspected, rebuilt (new o-rings) then reinstalled, or replaced if you find that bad gas has damaged internal components that o-rings can't fix. Such high psi fuel system would make it easy for deteriorating O-rings to be pushed/manipulated out of their normal seating area by the high psi and allowing the fuel to bleed off instead of going to its proper destination, then when the engine dies and the high fuel psi isn't on the system anymore, allows the o-rings to relax back into position to allow the vehicle to run again. (HOPE THIS HELPS ANYONE WHO'S LOOKING FOR ANSWERS) If you determine this be the cause of your stalling/no start, there is an O-ring/rebuilt kit available for this through mercedes-benz or you can even check ebay, type in fuel distributor and see prices ranging from $650-$1000 for a reman fuel distributor or around $90 for the well explained o-ring kit...

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Sailor
10

Thanks for continuing this thread. I still have my 560 SEL (now on to body work). Put a pile of money into this car, but I do love it. Suspension system, alternator, starter motor, hoses, door hinge mechanisms so they close smooth, etc. I must be nuts. I sometimes think about getting another car like it with a good body/engine/transmission and using this one to feed it parts, but that would put my marriage at risk.

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