W124 Fuel Supply

[weisdaclick]

Hi all, need some help here...

1993 W124 320CE M104 with distributorless ignition (in the UK), car has been idling like a pig recently - shooting up from 600 - 1500 rpm.

Today I cleaned out the air filter (not particularly dirty), sprayed some isopropyl alcohol on the air mass sensor and the other sensor in the inlet pipe.

The car started then shut-off after 10 seconds or so.

I worked out the fuel pumps weren't switching on and there was no fuel pressure so I took out the fuel pump relay and bridged pins 30 and 87 and could hear fuel gushing into the fuel rail, fuel pumps were on and working well.

I duly changed the fuel pump relay but this has had no effect, there is no pressure at all in the fuel rail with the ignition on.

Can anyone shed any light? There seems to be no fuel activity with the ignition on.