Help, what could be the reason the electric fuel pump doesn't work at startup?

[Bill R.]

your case i can't really help much since we don't get the diesels in the US and I haven't worked on one...

I would like to pass my grateful thanks to Bill R. Thank you very much Bill for your response with detailed illustrations .
Just could you tell me please where has installed the fuel heater relay ( what number is it in picture or where it has located? ) ? I know the number 2 is the fuel transfer pump's relay. I would like to test according to your recommendations. Thanks.

With best regards,
Arthur.

[arthur_525TDS]

I am from Yerevan (Armenia) and here there is just one BMW dealer (Euro Motors Armenia ) which does not serving the BMW cars with diesel engines.
By this reason I have not any way to solve my problem here. The single way is remote help, consulting ( via Internet ). I would like to get contact to BMW companies Customer's Support Group. It would be fine to get it from Germany.
Could somebody help me with getting a contact to BMW companies Customer's Support Group? Thanks.

[Nickhlx]

I am from Yerevan (Armenia) and here there is just one BMW dealer (Euro Motors Armenia ) which does not serving the BMW cars with diesel engines.
By this reason I have not any way to solve my problem here. The single way is remote help, consulting ( via Internet ). I would like to get contact to BMW companies Customer's Support Group. It would be fine to get it from Germany.
Could somebody help me with getting a contact to BMW companies Customer's Support Group? Thanks.

Hi Arthur,
I am Nick in England with problem in same area of starting and am looking at
glow plug relay as a possible faulty unit, when I saw your post.
I also have the 525TDS 1995 model
Nick

[Nickhlx]

Hi.

At the first I would like to say that my problem is common for cars with petrol and diesel engines. The problem is the following:

I know when I put the key on ignition ( before starting the engine ) the electric fuel pump ( which is in fuel tank ) should work ( for a short time ) to supply the fuel to engine. It doesn't work. What could be the reason? I have measured the voltage on fuse N23 ( the pump's fuse. The fuse was OK ) and there was not a voltage when I switched on the key on ignition state. The relay which supplies the voltage to that fuse also was OK. I think that from a reason (I would like to know WHAT reason ) the DDE doesn't send signal to mentioned relay. Maybe by the some reason there is insufficient pressure in fuel supply system? Maybe the fuel level sensor is responsible for the mentioned signal?
My thanks to everybody who will reply to my issue.
P.S.
Just when I start the starter the pump works. But it also should work before starting the starter, when the key has put on ignition state.

You are right - it should come on before the engine starts so the injector pump has a good supply of fuel to inject.
Nick

[iainand]

i too seem to have a similar problem, when my engine is warmed up the engine turns over sometimes for a good 20 seconds before starting.


the in tank pump doesnt seem to work when turning on the ignition if the engine is warmed up, until the engine is running!

if the engine is cold, the pump runs with ignition on before starting engine.

does this seem to be a similar problem to yours???

[calibra]

Ok been reading a lot of posts about this as im having the same prob if there is a heat sensor where would it be? my pump gets a low volt but thinking about it i have only tried with the engine warm is will try and get a reading first thing in the morning see if its higher