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Mark7810s
Member Since: 01 Aug 2017
Location: East Sussex
Posts: 5
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2008 tdv6 cranks but wont fire. |
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Hi, having problems with a tdv6 not starting. It will spin over and start the first time after sitting for a while but it wont stay running. After this all it does is spin over. Had it plugged in and you could see the fuel pressure building then dropping off as soon as it started.
The is plenty of fuel at the schrader bleed valve but next to nothing coming through the HPFP. Is this pump at fault?
The car was running fine then suddenly stopped. The fuel pump drive belt is intact as we checked this first.
Any input on this would be greatfully received
Regards
Mark
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8th Aug 2020 11:38 am |
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aja4x4
Member Since: 14 Apr 2019
Location: Westbury
Posts: 2461
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It sounds like the fuel pump is shutting off, could be the relay.
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8th Aug 2020 12:53 pm |
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Mark7810s
Member Since: 01 Aug 2017
Location: East Sussex
Posts: 5
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I presume were talking the pump in the tank? Will have a look in a bit!
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8th Aug 2020 1:06 pm |
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simbayoung
Member Since: 22 Apr 2009
Location: Pottsville
Posts: 13
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Mark when you say you had your car "plugged in" - do you mean you had a fuel pressure gauge in the fuel line or did you use a scantool ? Look up "Robbies guide to low pressure fuel system", which is on this website , it is an excellent resource. If you can isolate the cause not to be related to low pressure fuel pump (mounted in fuel tank) or blocked fuel filter , then most likely cause of your fault is the HPFP. My D3 recently went into limp mode randomly , but my IID scantool diagnosed code P2290 (low fuel pressure to injectors). Put in a new HPFP and problem solved. Without scantool diagnosis and a careful elimination of other possible causes this can be a daunting problem to solve.
Regards,
Ian (Simbayoung)
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8th Aug 2020 1:15 pm |
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aja4x4
Member Since: 14 Apr 2019
Location: Westbury
Posts: 2461
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Yes the pump in the tank, as stated above i would follow Robbies guide even if you dont have a pressure gauge you could use an ammeter to see if the pumps running.
When was the last time your fuel filter was changed? A blocked fuel filter can give simular symtoms, good pressure to start with which rapidly dies off as the filter cant keep up
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8th Aug 2020 1:22 pm |
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Mark7810s
Member Since: 01 Aug 2017
Location: East Sussex
Posts: 5
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Thanks, will bang a new filter on and check the realy out on the pump. I was more curious as to the hpfp failing instantly rather than a bit of a degradation in performance etc.
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8th Aug 2020 1:30 pm |
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Mark7810s
Member Since: 01 Aug 2017
Location: East Sussex
Posts: 5
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Changed filter new genuine one fitted.
Pump is drawing 7.9-8.1 amps
Relay exchnaged for a new one
Still no change. Shall i order a HPFP? 🤷🏻♂️
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8th Aug 2020 3:36 pm |
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jenseneverest
Member Since: 12 Jun 2017
Location: somewhere
Posts: 769
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try it with the fuel cap off
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8th Aug 2020 3:53 pm |
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Mark7810s
Member Since: 01 Aug 2017
Location: East Sussex
Posts: 5
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That has been tried, ive got a fuel pressure test kit coming monday so can rule out the tank pump and go from there. Seems to be plenty coming out of the schrader valve but a gauge will clear that up!
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8th Aug 2020 7:01 pm |
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aja4x4
Member Since: 14 Apr 2019
Location: Westbury
Posts: 2461
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It could ba a faulty crank sensor not sending a signal to the ecu and it then shuts down the fuel pump
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8th Aug 2020 8:26 pm |
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