ok guys my car is a 1993 525 TDS, please read my problem, im sure someone can help even though my car is a diesel.

as many folks may be aware these cars suffer a hot starting problem, i have noticed that this only happens when the car is warm enough that the glowplug light does not come on. i have also found that the intank fuel pump does not prime unless the glowplug light comes on too. - i believe this may be the problem (fingers crossed). it runs ok with engine running.

now i have read the wiring diagrams for both petrol and diesel models and have probed voltage at the fuel pump relay (this is brand new by the way).

i found that the wire from the glowplug relay to the fuel pump relay only has 12 volts when engine running or when engine cold and ignition on, it shows 1.7v when engine warm/ignition on, the wire from alternator never has battery voltage (which it should have surely??)

im going to wait until engine cold again and recheck voltages at each terminal on fuel pump relay again and again once engine warmed up.

hope someone on here with some electrical knowledge can help piece this together......................

these engines will run without the fuel pump relay installed, but starting can take a lot of cranking for the main injection pump to pull the fuel through and build up any pressure, - this is what seems to happen when the engine is warmed up and intank fuel pump does not prime

PS sorry for long post