Hi, Fuel consumption on my bmw e34 diesel has

Special tool from BMW works through the transmission oil pan, you can't buy the tool so BMW dealer is the only place to go.

One or more of the new injectors may be bad and delivering too much fuel. I don't think adjusting the pump is something that can be done without expert knowledge and tools.

ECU (Engine Control Unit) relay, fuel pump relay and oxygen sensor heater relay are located in the under-hood E-Box. The E-box is under the large black plastic cover at the passenger side rear of the engine compartment.

For Its Location Diagram Click the link below:

http://carrepairworld.blogspot.com/2016/06/where-is-fuel-pump-relay-located-on-bmw.html
This will help.
Thanks.

check for fuel leak at the pump. pull and fit new tips to the injectors. Have the injection timing checked by an accredited diesel shop ( same one that is replacing the injector tips)

If your fuel consumption is normal I don't think you have any worries.

The first thing you do is take it to the Beemer dealer and have a diagnostic scanner hooked up to see what is going on.

Last month, my wife complained of high gas usage as well. I suddenly remembered that I had forgotten to change the air filter the last time I did the oil change. It had been over 5 months since I'd put a new one in. So, we got a new air filter, and monitored the usage, and it was back to normal again. Maybe try this?

Seems that the fuel pump quit, check for fuel pressure, check for spark in the plugs and the fuel filter.

Hi,
This is the second Vw I have responded to in a fortnight.
Your lack of power I presume always happens when the glow plug light illuminates?
This is because it is causing over combustion to vaporised diesel, I would be looking in the Glow plug timer and relay, as for Turbo lag, I run a E34 6 cyl Bmw Diesel and the Turbo only kicks in around 2,500ish so maybe yours is a little tired or in need of a check up?
Hope this helped,
Paul 'W'
Onyer~EDson(:0) {#><U.K.
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u may face with a gear pro. transition from a low gear to high gear cause a high consume in your machine.