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48
Wed Apr 04, 2007 2:42 am
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Non Member
2120
Sun Dec 02, 2007 6:19 pm
Jersey C.I.
redodare wrote:Question 1, does this pump run all the time with the ignition on, pumping to the rear tank and back to the front?
Question 2, having removed this pump can I test it by putting a 12 volt current thru it ?
Question 3, Can i assume that the LH door pillar ground is ok as there are no probs with other front electrics (yet!!)
Question 4, Is there a relay somewhere that I have missed.
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10431
Fri May 28, 2004 11:58 am
Derbyshire
Non Member
2120
Sun Dec 02, 2007 6:19 pm
Jersey C.I.
clee wrote:Turn the ignition , but do not start and you should hear the rear pump prime from the rear tank for about 2 secs
Non Member
3474
Thu Apr 15, 2004 8:10 am
Colchester, Essex
JohnC wrote:clee wrote:Turn the ignition , but do not start and you should hear the rear pump prime from the rear tank for about 2 secs
Thanks Lee, I knew that I had read something about priming. It all makes sense now.I take it the fuel pump relay between the two rear seats is the one that includes the 2sec timer, and is only for the rear pump. As the relay for the atmo fuel pump is under the dash (RHS). Is the front pump relay for the turbo in the same area?
John
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2120
Sun Dec 02, 2007 6:19 pm
Jersey C.I.
David Gentleman wrote:The ECU controls the relay and holds it open for 2 seconds when not cranking. I still have a feeling that the front pump primes on the Turbo otherwise how can the rear pump make pressure if there is no fuel coming to it. I have two high pressure pumps on mine (front and back) and I can definately hear the front one prime on ignition.
Non Member
2120
Sun Dec 02, 2007 6:19 pm
Jersey C.I.
simonsays74 wrote:both pumps prime at the same time and are triggered by the same relay beside the ecu.
i know this for sure your right honourable john sir!
Non Member
3474
Thu Apr 15, 2004 8:10 am
Colchester, Essex
JohnC wrote:David Gentleman wrote:The ECU controls the relay and holds it open for 2 seconds when not cranking. I still have a feeling that the front pump primes on the Turbo otherwise how can the rear pump make pressure if there is no fuel coming to it. I have two high pressure pumps on mine (front and back) and I can definately hear the front one prime on ignition.
Just reading this I have just realised that I have the Service manual for the D501 Turbo. Under Fuel system, General Spec, The Priming pump is "at front under tank", The other is called the Electric Feed Pump, "inside rear right-hand wing". Each have a filter. Unfortunatly there is no writeup on how it operates, but I would assume that the 2sec prime voltage, according to the above, is applied to the front pump, confirming David,s contribution. Lets hope this helps redadare. I also have a diagram of the whole "Fuel circuit diagram" but not for the relay part of it. I think that comes in another manual. I will try and post the diagram, but I am off touring on Thursday for a few weeks, and "She who must be obeyed" is nagging me to do some packing, and get the car ready. But I will try my best. Might send her to town tomorrow, and get a chance then.
Watch this space.
Incidently I also have the manual for the A610, so I looked in there, incase they used the same priming system. However according to all the diagrams, it appears to have only one fuel pump, and one fuel pump relay, can anyone confirm, as it seems a bit strange to me.
John
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Wed Apr 04, 2007 2:42 am
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Non Member
3474
Thu Apr 15, 2004 8:10 am
Colchester, Essex
simonsays74 wrote:fit new pumps and the other thing you found is a supressor that can be by passed.
before by passing this, check with a volt meter that you are getting 12v to it and 12v after, if 12v going to it and less after then by pass it and retest your fuel pump, might not be knackered!
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Wed Apr 04, 2007 2:42 am
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