 | Home > Td5 > Defender 15p not starting |
 
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| Dr Phibes Member Since: 24 Apr 2024 Location: Melbourne Posts: 45  
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So the pressure should stay high after the pump stops, and the pump incorporates a non return valve?
It’s bafflingly hard to find a clear answer to this on any forum! There is discussion here but inconclusive: https://www.landyzone.co.uk/land-rover/td5...em.161412/ I can’t see how the pressure regulator would help- it just discharges fuel if over pressure. And the NRV in the filter head is optional and only seems to stop fuel flowing into the return from the engine assembly. |
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9th Dec 2024 8:34pm |
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| revd Member Since: 20 Apr 2024 Location: England Posts: 130 
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Did you put additive in the tank because you were having starting/running issues?
The job is a pain but I would still change the pump. I had an Elise that would crank but not start - it was the pump My old Td5 went from first flick of the key to multiple attempts- it was the pump Yours might not be the pump but you need to eliminate it as a possible cause |
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21st Dec 2024 7:51am |
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| Dr Phibes Member Since: 24 Apr 2024 Location: Melbourne Posts: 45
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I put additive in because I did with another vehicle and it made an appreciable difference. I bought the defender recently and am working my way through it so thought I would give it a shot.
I have put a new VDO pump in. The old pump was probably original but worked fine. Both reliably output 4.5 bar at the fuel regulator. I also replaced the main relay and fuel pump relay with new narva relays. I have checked that fuel is flowing properly in all of the lines. The only other things I can think of are injector seals, the ECU not firing the injectors, some weird head blockage, or the fact the air bleed valve is  fuel through per my other thread at https://www.defender2.net/forum/post1055263.html#1055263
The fact it doesn’t hold pressure seems strange. If someone has actually put a fuel pressure gauge on and observed normal behaviour it would be very helpful to know. |
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21st Dec 2024 8:10am |
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| A.Rubio Member Since: 04 Mar 2017 Location: Rocafort -Valencia Posts: 31 
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Have you checked the impact switch located in the engine compartment near the coolant reservoir to make sure it is not tripped?.
Saludos y suerte |
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21st Dec 2024 4:56pm |
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| Dr Phibes Member Since: 24 Apr 2024 Location: Melbourne Posts: 45
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Yes I did. When the inertia switch triggers it disables the fuel pump completely. So it won’t even prime.
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21st Dec 2024 8:09pm |
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