R: R: [ROVERNET - UK] Rover SD1 Fuel suppy

Ruotolo Gianluca (MERCATO STAFF) gianluca.ruotolo at enel.it
Tue Jan 30 10:14:11 GMT 2007

Dear friends and dear Ahl,

		thanks for the mesaage.
It's not for me, I don' t own any SD1, but a friend of Udine has a 1976 3500 Mexico brown and he had some fuel supply problems, very rare but not easy to solve.

I'll pass him these informations and I hope these suggestions will be helpful for him.

By the way, by us SD! Are becomind rarer and rarer.
I've always loved them, colud be a good idea for the next car...

Best regards, Gianluca.

-----Messaggio originale-----
Da: rovernet-bounces at lyris.ccdata.com [mailto:rovernet-bounces at lyris.ccdata.com] Per conto di Anders Hedelund Larsen
Inviato: mercoledì 24 gennaio 2007 22.27
A: rovernet at lyris.ccdata.com
Oggetto: Re: R: [ROVERNET - UK] Rover SD1 Fuel suppy

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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