XJ6 & XJ12 Series I, II & III 1968-1992

fueling issue

 
  #1  
Old 07-10-2014, 08:00 PM
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Default fueling issue

fuel pump runs when starter engaged but wont run when key released, ignition on and moving afm flap does not activate starter.... where do i look next??
thanks in advance

Darren
 
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Old 07-10-2014, 10:17 PM
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Try this

Fuel Pump Circuit Checklist



Cheers
DD
 
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Old 07-11-2014, 01:56 PM
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thanks Doug, i had to copy and paste into a word doc so i could print it big enough for my old eyes to read! I jumpered over the fuel pump relay and car will run this way, it lets me do a few other things without panicking over this issue!!
 
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Old 07-11-2014, 04:29 PM
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To expand on Doug's info....

I had heaps of trouble with the fuel pump cutting out, usually when I was at full chat passing 10 cars at once, and up a hill too !!

There are two tiny contacts on the end of stalks inside the compartment atop the AFM. Once you get the black cover off, you'll see them and also see that there is an operating lever made of bent wire, that keeps the contacts apart until the air flap moves. The volts via these contacts switch the fuel pump relay, which is by-passed when the starter motor is operated. What happens is the springiness of the stalks diminishes over time so they don't make good contact. It is mentioned in Roger Bywaters article on the XK EFI system.

Fuel injection and the Jaguar XJ6 4.2 Series 3 / AJ6 Engineering
 
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