75ZT Community

I am aware of the problems with the under bonnet pump on the CDT's. My question is this. My pump appeared to fail, it had been noisy for a while, 10 months ish, but had always worked. Then suddenly it failed one day at work. No amount of whacking it got it going. It just suddently whirred into action after a few more tries of the ignition, with no further taps.

Once running, I ran it over to a garage I know and trust and we fitted a known good used one. This replacement pump is lovely and quiet and gave a much smoother tick over once fitted. Job done, I thought.

But then today after a quick, just before it closes, trip round my local Tesco's, it wouldn't start again. I gave it a good whacking and kept trying the ignition to get it to purr into life, with no joy. Eventually after 10 - 15 mins of trying it did start up and we were off. The starter wasn't lazy or anything so am sure the battery is good and strong. Also I had just under half of diesel and my in tank pump is working fine.

Now this pump is very quiet when running, so I feel its good. Do I have an electrical gremlin rather than a failed UBP? How do I check? Am loathe to throw another £90 or so pounds at it, if it isn't the fault.

Thanks in advance

I am no expert on these cars, but I do wonder if it is the cam sensor?

On 2 occasions my car would not start, after running just minutes earlier, was diagnosed as possible cam sensor. I did not replace the sensor as the fault only occured twice. The last time was last March, no problems since.

I know what you're saying but the car wasn't running hot, Tesco's is literally 1/2 mile away, and was 1st use fo the day. Also it's clear that the UBP isn't running, I don't think the cam sensor affects whether it runs or not?

Thanks for your help though. I do have a spare cam sensor so it could be worth a try.

Mr B, I have a leaky under-bonnet fuel pump I removed a couple of weeks ago you are welcome to if you want it. You could try plugging it in next time you have a problem and see if it runs, that should tell you whether it's the pump or something else at fault.
I'm only a couple of miles from you.

Love is like a snowmobile, speeding across the frozen tundra.
Which suddenly flips, pinning you underneath.
At night, the ice-weasels come...

Thanks Unclefista. I'll let you know if I need it. The replacement runs so quietly I refuse to believe it is faulty, but I guess it could be.

The offer is still there, the pump is no use to me
My new pump is louder than my old one, but then it was only £50 from Ebay, annoying really as my leaky one worked fine and was an OEM. As money is tight at the mo, I have my fingers crossed my new Chinese pump lasts longer than most Chinese bits I buy

Btw, do you still have any of the wheels you were advertising a few months back ?


Love is like a snowmobile, speeding across the frozen tundra.
Which suddenly flips, pinning you underneath.
At night, the ice-weasels come...

Thanks. Now think it is not the pump as have had to leave it at work today as it refused to start but both pumps were merrily whirring away?!?

And yes I have a set of 5 Union wheels that I have no use for. 2 good, but budget tyres, 215 16" tyres to go with them but the other 4 tyres that are fitted are either illegal or very close to being illegal.

Did you sort out your no starting problem Mr B?

OMG I didn't realise I never closed this thread by telling you all what happened.

The pump had gone, it was making all the right noises but it wasn't producing sufficient pressure for the ECU (Engine Control Unit) to allow the car to try to start. So we replaced it with a brand new MKON one, only to find the ECU had had a bath while being stuck outside my work. We managed to replace the ECU, immobiliser unit and key back to get the car home. With the new ECU onboard we get true readings and we (Russ with his T4 (Testbook version 4.Computer Diagnostic System)) discovered that all was not well with a few things.

That is when I decided to go for the tourer that was going for just the right money on the club site see here an-interesting-day-t4480.html

Chris