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Robbie's Guide To The Low Pressure Fuel System
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KostasA
 


Member Since: 23 Aug 2015
Location: nairobi
Posts: 124

Greece 

My view is that your initial readings are not bad. given that you have changed the LPFP the fluctuation is not a good sign. i don't think that HPFP has anything to do with this since those measurements are just before the pump.
most likely this fluctuation triggers the faults as the HPFP doesn't 'see' the correct pressure on the suction and shuts down her operation.
interesting thing is to find out the cause of the fluctuation, again given that LPFP is changed. have you checked the pipes from the reservoir to the engine? fuel filter?
if there is no leak there or any pipe has been cut second thing i would check is the wiring
  
Post #185754814th Sep 2017 3:45 pm
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Weedyapl
 


Member Since: 23 Sep 2015
Location: Melbourne
Posts: 57

Australia 2005 Discovery 3 TDV6 HSE Auto Causeway GreyDiscovery 3

jetmech wrote:
Well I have changed the LPFP with a Land Rover pump but disappointingly nothing has changed.
The pressure is steady at 6.5 psi and a current draw of 3.4 Amps with the engine off. With the engine running the pressure fluctuates wildly and the current draw is 4.1 Amps.
Could the fluctuating pressure be caused by the HPFP?
The fault codes seem to alternate between P0087-00 (fuel rail/system pressure too low) and P2290-00 (injector control pressure too low)


It's probably worth seeing if you can borrow another known working gauge as well after doing some research fluctuations like that can be a faulty gauge as well especially if you haven't used it on anything else before.

Having said that I have also heard of mechanics having to test fuel pumps before installing because they have had DOA pumps straight from factory and had to drop the tank multiple times. Not with our car but Ford fuel pumps.

If you go back to page 5 of this thread someone else had same issues as you replaced the LPFP same as you but only replacing the HPFP fixed the P2290-00 so I think you might have a bad HPFP. I would think a bad HPFP would also cause P0087-00. I have a very bad LPFP and I don't get either of these DTCs.

Even with a cheap scan tool you can get rail pressure iCar 930 for example - my rail pressure is fine even with a crappy 2.8A/4PSI max/9 seconds to prime LPFP.
  
Post #185773715th Sep 2017 4:26 am
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KostasA
 


Member Since: 23 Aug 2015
Location: nairobi
Posts: 124

Greece 

that other was me. i had a P0087 and proved to be the HPFP, problem though is the fluctuation on the gauge. but as you rightly say can be the gauge itself.
  
Post #185773915th Sep 2017 4:49 am
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Dartmoor Dave
 


Member Since: 08 May 2017
Location: South West
Posts: 17

United Kingdom 

OK Guys, the disco is back from the local independent guy. When it was delivered to him it wouldn't run over 2000 without bing-bong and drop to idle. The following day it wouldn't start at all and ultimately a service exchange main injection pump and recon injectors were fitted. I don't follow this as such because there was no inkling of running problems as per poor start / running / misfiring etc but those are the pitfalls of modern systems.
Needless to say, it fired instantly and went off up the road like a raped ape. My neighbour is very glad to get it back with full power and normal service has resumed.
Time will tell as to any longevity of this fix but I've kept up my story in case anybody else with similar problems can benefit.
Regards to all.
  
Post #18770448th Nov 2017 8:28 am
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