 | Home > Td5 > TD5 fuel/running problem |
 
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| landy andy Member Since: 15 Feb 2009 Location: Ware, Herts Posts: 5695  
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First thoughts would be in tank fuel pump.
Does it start better after prime proceedure? Is pump noisy? Can you always hear pump running? Andy |
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27th Nov 2013 8:58pm |
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| ChrisJ Member Since: 12 Nov 2013 Location: Warwickshire Posts: 231  
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Thanks for your reply Andy.
No I wouldn't say it does start any easier after priming, the fuel is very noisy and almost like its struggling but only with around the half tank, once above half it's fine. My fist thought was the fuel pump I just thought it a bit strange with the half full thing. Thanks |
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27th Nov 2013 9:09pm |
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| landy andy Member Since: 15 Feb 2009 Location: Ware, Herts Posts: 5695
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There could be a problem with the pump filter or collection pipe inside the tank. Has a hole been cut to see the top of the pump?
Andy |
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27th Nov 2013 9:13pm |
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| ChrisJ Member Since: 12 Nov 2013 Location: Warwickshire Posts: 231
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No, no cutting, I would say the garage has not even took the tank off or looked at the pump at all, they seem to thinks its all to much trouble so the chap is looking to move it on rather than spend any More on it.
I'm just looking for some ideas on what it could be so that I don't end up with a money pit, do you think it's more likely to be pump related rather than engine related as in injectors etc. Thanks |
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27th Nov 2013 9:25pm |
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| JWL Member Since: 26 Oct 2011 Location: Hereford Posts: 3443  
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Sounds a lot like my current annoyance. I have a feeling that it is down to either the return valve or the air bleed valve in the top of the filter housing. If I do the prime sequence it doesn't really improve starting, does help but doesn't cure it but I have been running the tank low recently. It has done this before and after a run of poor starting but no problems when running, it just decides to play ball and go back to being normal and start as soon as the starter motor turns. The last run of this was in August and it's done 5k miles since. The fuel pump on mine is noisy, it has been for the past 4 years with no change, sometimes it is quieter with a brimfull tank but not allways.
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27th Nov 2013 9:58pm |
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| JWL Member Since: 26 Oct 2011 Location: Hereford Posts: 3443
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Managed a double post, sorry,
 me being hamfisted |
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27th Nov 2013 9:58pm |
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| ChrisJ Member Since: 12 Nov 2013 Location: Warwickshire Posts: 231
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Thanks for the reply that's really helpful.
Do you think it could be drawing air through the system? Or faulty return valve allowing the fuel to run back? I suppose when thinking a bit more about it, it does sound more like a fuel feed problem firstly then once the line has cleared/ filled its ok, this one does run a bit rough though, I wonder if the pump has been damaged by the original fault. Thanks |
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27th Nov 2013 10:24pm |
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| JWL Member Since: 26 Oct 2011 Location: Hereford Posts: 3443
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It wouldn't hurt to get a Nanocom/Hawkeye plugged in if you could find someone local to take a live data copy and then get an idea of what else could be problematic as it seems that it has been unloved.
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27th Nov 2013 10:33pm |
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| Splitpin Member Since: 07 May 2013 Location: Midlands Posts: 100
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Tank breather perhaps, is there a vacume inside the tank?
Have you tried opening the that filler cap? I had a van once where you would need to open the cap after 100 miles!! |
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28th Nov 2013 6:11am |
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| Paulv8 Member Since: 09 Jun 2013 Location: Milton Keynes Posts: 618 
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I'm with splitpin. V8 90...WIP
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28th Nov 2013 8:11am |
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| JWL Member Since: 26 Oct 2011 Location: Hereford Posts: 3443
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Having a bit of a ponder at the moment. My 2002 Td5 is being a pain to start, has got worse over the past couple of days, it is definately a lack of diesel to the injectors. As soon as it has been parked for more than 5 minutes there is not enough fuel in the system to start, it might catch but then stop, probably what's left from the FPR. After going through the prime sequence it still takes some winding over to encourage enough fuel to run. The FPR was replaced recently as well as the injector seals and washers, I'm veering away from any causes there because as soon as it's running there are no power or idling issues whatsoever.
My thoughts are either the non return valve or the air bleed valve on the filter housing so today I thought to get out there and investigate. Turns out there is not a non return valve fitted and the air bleed valve is there but I can't make head nor tail whether it is working as it should or not. There is a plastic shuttle in the filter side but I can't seem to blow or suck through it no matter whether the thing is pulled out or pushed in. Looks like I'll just have to go and get another one to rule it out. Pity I can't "borrow" one off someone elses but everybody I know with a Td5 need their motors as well! Anybody else got any ideas on the initial lack of pressure in the system, I can't really feel that there's much blame at the pump due to the perfect running when started. |
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28th Nov 2013 8:04pm |
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| Paulv8 Member Since: 09 Jun 2013 Location: Milton Keynes Posts: 618
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So what happens if you switch to position II and wait before starting? surely the fuel pump should pressurize the entire system in readiness to start? V8 90...WIP
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28th Nov 2013 8:25pm |
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| JWL Member Since: 26 Oct 2011 Location: Hereford Posts: 3443
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Pump runs, you can hear it "presurizing" the system but there is no diesel there to start the engine, it's allmost if it is just sending it back to the tank as you would expect if there is no use for the diesel at the injectors.
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28th Nov 2013 8:31pm |
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| Paulv8 Member Since: 09 Jun 2013 Location: Milton Keynes Posts: 618
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I am no expert, but well my understanding is that the tank pump pressurises the system and the fpr ensures there is suitable pressure at the injectors, it returns any un-needed fuel to the tank via the return pipe. if it wont start, but does eventually, it sounds like air leaking into the head side of the fuel system to me, but I don't know enough about that side of the system to diagnose.
Sorry chap. V8 90...WIP |
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28th Nov 2013 8:52pm |
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