I'm a first time poster here but I've used the site many times to fix problems.

My car just decided not to start this afternoon. It was running fine when I went to the store.I came out of the store and it cranks over fine but won't start. I checked with a timing light and I'm getting spark at the plugs. I located the OVP relay and checked the fuse and it was fine.
Should I replace the relay anyhow ?
I'm at a loss on what to do now .

Thanks in advance .
Al

Possibly MAS control unit is at fault. Can you hear the split second buzz from the fuel pump package when you turn the key to the "run" position?

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Regards,
Aaron

Replace the OVP.

Replace the Fuel pump relay.

Check the crankcase sensor.

Check to see if the updated OVP has been installed and/or replace with a known good unit. Fuse alone is no indication that OVP is working.

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Zafar
94 E320 58000 Miles

If you are Positive about spark, then it is not OVP .
I would do a fuel pressure test at fuel rail port...
if none, then check pump relay/power as Zaf has posted.

Fuel Pump, go under the Car and tap firmly on the fuel pump to see if it comes to life, replace it if it does, don't forget a filter also

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Jerry

2004 SL500 Black 55K Miles
2002 s500 Black 90K Miles
1986 300E Gold 233K Miles
1966 Twin Cessna 320D
1989 Jeep Cherokee 233K Miles
1994 Ford Van E150 399K Miles

After having the car sit overnight, I went out and cranked it first thing and it started up but immediatly the revs dropped off and it died. It started twice more for a few seconds (1 or 2) but I couldn't keep it running.
I bought a new fuel pump relay and replaced it but there is no change at all. It turns over just fine but it will not catch and start running. I can't hear anything from the fuel pump,but its dark outside so I'll wait till tomorrow and see if smacking the pump helps anything.
Zarf posted that I should check the crankcase sensor. Where is it and what should I be looking for ?
Also the MB parts guy said it can't be the ovp if the radio operates. Does this sound kinda fishy to you ? What are some indications that I can easily check to eliminate the ovp. According to some pictures posted on other threads mine has been replaced sometime in the past.

Thanks for the replies.

Al