Master
Hi All
This is doing my head in ..
2015 D4 TDV6
When I pull fuse F1 (25A White Fuel Pump Fuse) with the engine running I would expect the engine to splutter and die but is doesn’t it just keep right on running no problem???!!
WTF - Am I actually dumber than I think I am ?😬
Wizard
SubscriberIf I'm reading the wiring diagram correctly, the Engine bay fuse 1 is powered by the relay when the ECM wants to operate the in tank low fuel pressure pump. If that's correct, then removing the fuse when the ECM wasn't powering it anyway would make no difference. When the ECM decided it wanted to power the low pressure pump it would then throw an error message and, indeed, the engine would splutter to a stop and your dash would light up like a christmas tree.
Extracted pages here:
2013 D4 expedition equipped
1966 Army workshop trailer
(previously SII 2.25 swb, SIII 2.25 swb & lwb, P38 Vogue, 1993 LSE 3.9V8 then HS2.8)
Super ModeratorNo it won’t. The feed pump in the HPFP will comfortably keep the engine going under low load without the LPFP contributing in any way.Originally Posted by DieselLSE
It’ll start and drive without the LPFP running. It just won’t like it and under a bit heavier load it’ll start complaining.
TopicToaster
SubscriberIt’s already noted in the annals of this site that the high pressure pump can pull through the low pressure enough for the engine to keep running without the low pressure pump powered. It won’t run well at pace, but will run. Likely not great for the HPFP however.
So no, you may not see any change when pulling the power to the LPFP
2010 TDV6 3.0L Discovery 4 HSE
2007 Audi RS4 (B7)
Master
Update -
looks like Brad C is right..
- Removed Relay 8
- Started Car
- Went for a drive around the block no problem.
??
TopicToaster
SubscriberWhy the ??
What don’t you understand?
2010 TDV6 3.0L Discovery 4 HSE
2007 Audi RS4 (B7)
Master
What I am trying to do is find a way to connect the disable from the GPS Tracker into the fuel pump circuit.
The tracker has a feature that pulses the disable on/off for a minute before disabling the vehicle. This will slow the thieving little bugger down and give him time to stop before disabling.
please PM me if you have any suggestions that you don’t want public.
Master
Hi DiscoJefster
Understand now - I think so thanks
If I understand correctly the HPFP Is a mechanical pump so I will not be able to ‘disable’ that ..
Do you know if putting a valve in the fuel line will damage the HPFP? Suppose it will be similar to just running out of fuel?
cheers Harry..
TopicToaster
SubscriberI guess you could look to isolate the engine ECU as a simpler approach.
2010 TDV6 3.0L Discovery 4 HSE
2007 Audi RS4 (B7)
Super ModeratorAhh, that's dead easy. There are 2 valves on the HPFP, the volume control valve and the pressure control valve. Disconnect either of those and they open right up. In the case of the PCV it drops the fuel pressure below that required to support injection and he engine will die. In the case of the VCV it diverts all fuel back to the return line. Either will stop the engine.
Edit. The VCV *closes* on no power. Same result.
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