w124 fuel pump relay location

[stephenson]

My 1993 220TE ground to a halt yesterday. The AA man found that fuel was not getting pumped through. He checked what he thought was the fuel pump relay and said he could hear it clicking. I'm not sure he was looking at the right relay. This relay was behind the battery on the rhs of the ECU with a fuse on top of it. Reading past posts the fuel pump relay shares the kickdown function as well. On the LHS of the battery are two relays. The front one is black with the no. 003 545 50 05 and 4 Zyl Kickdown written on it. However it only has 4 pins so I doubt it is the fuel pump and kickdown relay. Behind this relay is a green coloured one which is more difficult to get at. Does anyone know the the correct relay and the pins to short to check if the pump is OK?

 

[stephenson]

It is the green relay

Looked up Euro Car Parts and they had the relay available for £20.45 including postage + vat. Just received it and it is the green relay which has a 30A fuse plugged in the top of it. The fuse was blown. Replaced the fuse and the car burst into life - for 0.5 sec! The fuse was blown. Tried the new relay in case there was a problem with the old relay but again fuse blew. Looks like the pump is faulty then. Surely a blockage would'nt cause the fuse to blow?

 

[MIW615]

Fuel blockage would not cause the fuse to blow, it is as you say more than likely the fuel pump. Easy way to test, locate the fuel pump, remove the live feed from the pump then turn on the ignition and crank the engine, obviously it will not start, but if the fuse doesn't blow then the pump is faulty.

 

[SJMaxson]

I thought that the W124 had two fuel relays. Just something I remember an indie mechanic saying to me with regards to an old '86 230TE we used to have....

 

[television]

petrol pump

I think its the same as on the 123,underneath the car near the tank with the inline filter. I do know that these pumps can and do fail, the points fall apart shorting things to ground

 

[stephenson]

Back on the road

Didn't fancy the job of replacing the pump myself so asked a local mechanic. A motor factor supplied a pump at £135. Although an email from Dronsfield offering a second hand pump for £35 subsequently arrived! The job proved a bit more complicated than expected. The pump was removed and checked to be found OK. The mechanic then set about trying to find a wiring fault, ripping up carpets etc. He brought in an auto electrician who thought that my model had two pumps - which turned out to be the case. Apparently the two pumps are not positioned together as intimated in the Haynes manual. The other pump which is positioned immediately after the fuel tank was the faulty one.