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Home > General > Td4 Fuel pump clarification |
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Denboy Member Since: 24 Oct 2019 Location: Merseyside Posts: 56 |
In tank pump for moving fuel from one side to the other
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16th Dec 2020 3:40 pm |
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I Like Chips Member Since: 25 Jun 2017 Location: Ascott Under Wychwood Posts: 1545 |
There is negative suction from the tank through the filter to the high pressure pump. The HP pump provides positive pressure to the injectors via the common rail.
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16th Dec 2020 7:24 pm |
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AndyHarding Member Since: 16 Dec 2020 Location: Cheshire Posts: 3 |
Thank you both for the replies. I have had someone come out and run diagnostics on it but they couldn't find any codes and they advised me it was the in tank pump. As this has been changed and I know when I primed it there wasn't any air in the system but the car still wouldn't go I'm guessing my problem must lie with the injector pump then |
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16th Dec 2020 9:26 pm |
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pab Member Since: 28 Aug 2012 Location: Now in Mid-Wales Posts: 2007 |
Your quote from the manual sounds as though it’s referring to the petrol engine, which does use an electric lift pump. The diesel, as you’ve discovered, doesn’t with the in-tank pump simply moving fuel across the saddle. The diesel uses a mechanical high pressure pump which is driven from the end of the exhaust camshaft. There have been cases in early cars where the camshaft has broken at the pump end, resulting in no drive to the pump, so that’s something to check if yours is an early car. Other than that the pumps themselves seem pretty reliable. |
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17th Dec 2020 10:53 am |
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AndyHarding Member Since: 16 Dec 2020 Location: Cheshire Posts: 3 |
Thanks Pab, it is a 57 plate and I think I did see a thread about a thin wall on the camshaft breaking and a revised unit now being available. I'll get the pump off and check for that. Thank you again for the advice |
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17th Dec 2020 1:37 pm |
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brom Member Since: 06 Nov 2020 Location: Vrancea Posts: 25 |
Hi,
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18th Dec 2020 7:05 pm |
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