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  #11  
Old 11-21-2015, 03:21 PM
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So just to add to the confusion....just spoke with my mechanic and we left vehicle parked indoors in heated shop overnight. This morning went to start, fuel pressure there and started right up no issues at all. It is really strange seems to be temp related at most times, no start or fuel pressure in cold weather. Brand new batter btw.

We moved it outside to let it sit and try it again.
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  #12  
Old 11-21-2015, 03:25 PM
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Only diagram that I have been able to find in Bentley for a N62 engine is ELE 117.

Don't know why you can get software to power up the fuel pump but can't get the key to prime the fuel pump.

The prime is normally controlled by the DME. Have you scanned the DME for error codes?
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  #13  
Old 11-21-2015, 04:05 PM
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Yes that is the part which I am confused about. Also this morning, absolutely fine.

Yes we did scan, zero error codes. I am at a loss......the change in climate is the part that is really confusing things.
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  #14  
Old 11-21-2015, 04:14 PM
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Condensation frozen up at sub-zero environment and clog the fuel filter, possibly affecting the fuel pressure regulator.

Just my 2 cents. Good Luck!
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  #15  
Old 11-21-2015, 04:30 PM
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Mmmm good point, still does not explain no priming of fuel pump.
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  #16  
Old 11-21-2015, 04:36 PM
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Cracks or a bad solder joint in the circuit board in one of the module that opens up when the temperature change is what comes to my mind.
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PORSCHE 911 Targa 1982 The Garage Queen
Audi Avant donated to Kars for Kids
BMW 525IT Sold
Audi 4000CS Quattro Sold
Jensen Healey Lotus Powered Sold
Opel 1900 Sold
Triumph Spitfire 1971 Sold
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  #17  
Old 11-21-2015, 06:19 PM
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That could be a possibility I guess. I will try a few things and report back, any further suggestions would be appreciated!
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  #18  
Old 11-21-2015, 07:17 PM
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Priming problem you mean no fuel pump engagement while key at ON, or priming with no pressure at fuel rail? If latter, fuel filter will explain it.


Quote:
Originally Posted by Juggernaunt911 View Post
Mmmm good point, still does not explain no priming of fuel pump.
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  #19  
Old 11-21-2015, 07:31 PM
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When turning key to on position, no pressure at all at fuel rail and pump does not kick in at all.
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  #20  
Old 11-22-2015, 01:09 AM
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Relay K96 controls power to the fuel pump. Relay K96 location can be found on page Fuel Injection 130-7 of the Bentley Manual. The relay is located on a panel located above the glove box. You could have a faulty relay that is affected by cold weather.
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Lotus Europa 1970 Destroyed by fire
Lotus Europa 1970 S2 Renault Powered
Lotus Type 52 1970 Twincam Webers Powered
PORSCHE 911 Targa 1982 The Garage Queen
Audi Avant donated to Kars for Kids
BMW 525IT Sold
Audi 4000CS Quattro Sold
Jensen Healey Lotus Powered Sold
Opel 1900 Sold
Triumph Spitfire 1971 Sold
Triumph Spitfire 1968 Sold
Plymouth "Cuda" 340 Six pack SOLD
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