R: [ROVERNET - UK] Rover SD1 Fuel suppy
Anders Hedelund Larsen
anders at xoz.dk
Wed Jan 24 21:26:52 GMT 2007
Hi Gianluca, trying again.
Steady ground: My word for 'not unconnected', but connected (0 Ohm) to
vehicle body, no matter what.
So my first thought was: There is not a broken wire, there is a damaged
and short-circuited wire. So where? And where should it get its supply?
And why do I not see any broken fuse?
Being an electrical engineer that was my natural reaction: A wire is
damaged, must be traced and repaired, possibly replaced. It is running
the length of the car, so may be anywhere. Therefore I looked for the
supply point and was much surprised when the electrical diagram
apparently showed the engine oil pressure switch.
Actually for clarity and to simply believe and understand it, I made a
drawing copy of the parts of the diagram that related to the fuel pump.
When diagram basics were understood, it was just "Eureka, I got it".
Went to the car, made the short bypass wire down at the engine side and
everything worked as figured out.
I have been wondering WHY Rover did this: If no oil pressure, fuel
supply will be cut and engine stop.
* If for engine protection my experience is that engine dies
immediately, long before carburettor float chambers will be empty.
* But of course if you have a crash and engine is forcefully
stopped, the fuel pump will cease to supply petrol to potentially
cut hoses: Prevent fires.
Any good/better guesses out there in Roverland?
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