Low pressure fuel sender assembly unplugged, car no go when plugged in???

[CamPatt]

Hi there Team, another one.
have recently acquired a beautiful 03 RS6 Avant. But alas has several issues that need to be sorted before being driveable. Most a pretty typical - but this is new to me at least.
so, the previous owner has had the ‘low pressure fuel sender’ unplugged which I turn stops the fuel gauge & mileage dusplay note function.
but when a mechanic inspected & plugged it back in, the car would start.
woukd we Simply say that this part just needs replacing, or is it a bit more complexed than that?
thsnks all.

[89 Coupe]

Hi,

If there is a problem with the fuel sender unit some diagnosing with a multi-meter would be a good start, some resistance checks to make sure the sender is working as it should.
The low pressure sounds concerning and likely to be the cause of the no start fault when plugged in, is there enough supply voltage to the fuel pump? Or rather any more information around 'low pressure fuel sender'

Maybe best to get the vehicle scanned yourself and start from there. Rather than going off what previous owner has mentioned.

[CamPatt]

Ok.....

Finally got my own Ross-Tech VCDS - Very Cool.
Just did first scan, so now have some real data on this fault:

17473 - Fuel Pressure Regulation
            P1065 - 008 - Regulation Discrepancy

Currently this is unplugged when plenty of fuel in tank, the car will still start/drive.
But when plugged in the car wont start all... ?

Keen to get clear what needs doing so to repair process (& and not get tucked)

[89 Coupe]

If you plug it back in and clear all the fault codes then scan the car again, what does it come up with?

[CamPatt]

I appreciate the input here all (thanks).
OK so, cleared codes and re scanned - with plug back in. and no fault was raised regard fuel pressure (I can hear the sound from the fuel pump, so that good right).

No other faults relating to fuel.....??

Car will not start though, not even splutter. just turns when cranking the starter.... (no fuel or spark?)

[89 Coupe]

Did you scan the car after the no start issue? I would have thought it might show where them problem is then

Sorry I should have specified that in my last post