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Old 3rd October 2023, 07:04   #1
markgallagher434
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Exclamation Leak back test

Good morning to everyone.

I hope someone can help me .
Rover 75 CDTI
I have just done a leak back test the car is not starting new pump fitted inline and under the bonnet new seal fitted on Hp pressure pump valve also crank shaft sensor test OK and camshaft sensor It did start on easy start but not anymore .
Hence now leak back test Upon cranking a good 2 minutes only no 4 bottle started to fill and filled up so I stopped cranking No 1 2 and 3 had nothing in them .
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Old 4th October 2023, 04:05   #2
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Question Only one bottle filled up

So nobody has a clue why only one bottle filled 🤔
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Old 4th October 2023, 09:19   #3
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So nobody has a clue why only one bottle filled 🤔
Hi Mark.
It sounds like the other three are ok but the one is leaking bad if it filled up with cranking over 2 mins pull it from the car and replace, or clean the tip and add new copper washer.

Have you replaced the regulator O-rings on the HPFP try also cleaning the fuel rail sensor with some electrical contact cleaner, look for any corrosion on the pins.
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Old 4th October 2023, 10:06   #4
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Hi Mark.

It sounds like the other three are ok but the one is leaking bad if it filled up with cranking over 2 mins pull it from the car and replace, or clean the tip and add new copper washer.



Have you replaced the regulator O-rings on the HPFP try also cleaning the fuel rail sensor with some electrical contact cleaner, look for any corrosion on the pins.
I agree with this, change injector 4.

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Old 5th October 2023, 05:25   #5
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Thank so kindly for your advise I will order a set of copper washers and then proceed with your advise Then will come back with a update.
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Old 18th November 2023, 07:50   #6
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I agree with this, change injector 4.

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OK It's been a while I am in Cyprus could not purchase a injector here I had to get a set from the UK .
Today I have changed no 4 injector and done a leak back test Perfect now after 2 minutes of cranking only the tubes filled up 3/4s full all equal.
Changed seals on hp regulator. Just tried to start it and it's trying ran for a few seconds and stopped Been trying for half hour now still trying to run but no luck 🙃
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Old 18th November 2023, 07:52   #7
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OK It's been a while I am in Cyprus could not purchase a injector here I had to get a set from the UK .
Today I have changed no 4 injector and done a leak back test Perfect now after 2 minutes of cranking only the tubes filled up 3/4s full all equal.
Changed seals on hp regulator. Just tried to start it and it's trying ran for a few seconds and stopped Been trying for half hour now still trying to run but no luck 🙃
ps only the tubes filled 3/4s not the containers
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Old 18th November 2023, 10:22   #8
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Default Fuel pressure rail sensor unplugged

I have found unplugging the fuel rail pressure sensor it starts but only runs for about 5 seconds or so
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Old 19th November 2023, 05:49   #9
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I have found unplugging the fuel rail pressure sensor it starts but only runs for about 5 seconds or so
I would say even thou I have fitted new pumps the in tank one is not doing its job right because even thou the square piece sits in the tray at the bottom the pipes fits the other way round stretching round from the back a cheap after market pump .
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Old 19th November 2023, 08:32   #10
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Hi Mark.
I note you have a 2004 plate car so we are all reading from the same page, does it have the under bonnet fuel pump, if so have you checked the flow from it with the ignition on number II and the pipe going into a bottle of container.

It needs to be a good flow without any spluttering, when was the fuel filter last changed.

If you only have the in tank pump version that needs to be seated correctly and some after market pumps are rubbish, have you tried using a little bit of easy start again into the egr hose off and spray only a little, do not keep doing it though once will be enough.

I am presuming also that the plenum is dry and not been flooded with water at any time.

Battery is fully charged.
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