'95 S280: how to check the fuel pump electricals? - PeachParts Mercedes-Benz Forum

atikovi · #1 06-20-2009, 08:34 AM

My gray market '95 S280 all of a sudden won't start and I checked fuel pressure which is at 0 and I don't hear the fuel pump coming on when I turn the key. Where would the fuse and relay be? I have the WIS on my computer but can't find the wiring diagrams. What section would they be in?

Arthur Dalton · #2 06-20-2009, 12:01 PM

Give the OVP a few taps.....

atikovi · #3 06-20-2009, 07:14 PM

Is that a tall relay with a fuse on top? Where would I find it under the hood?

atikovi · #4 06-20-2009, 08:57 PM

And does this car even have an OVP valve?

Arthur Dalton · #5 06-20-2009, 09:27 PM

I think we went through this a while back and you found that the Alarm immobilizer was a problem and that there was no OVP on that model

I have NO info on S280 at all....

atikovi · #6 06-20-2009, 09:59 PM

S280 is just a S320 less .4 liters.

Arthur Dalton · #7 06-20-2009, 10:17 PM

Yeah,,,I know that.

But I don't know if it uses a Base Module or an OVP.
US E320 uses OVP, S uses BM.. and Euro I have no idea.

So, check for both ...

atikovi · #8 06-22-2009, 04:55 PM

Looks like the fuel pump is bad. I put 12V and ground directly to the terminals with a jump box and it just made a faint buzz sound. Fuel presure gauge didn't move. What should I replace it with? Pierburg, Bosch, this one on Ebay:

http://cgi.ebay.com/ebaymotors/Mercedes-Fuel-Pump-190E-C220-C280-E320-SL320-S500-911_W0QQitemZ110356516909QQcmdZViewItemQQptZMotors_Car_Truck_Parts_Accessories?hash=item19b1c2d02d&_trksid=p4506.c0.m245&_trkparms=65%3A12%7C39%3A1%7C72%3A1171%7C240%3A1318