JDW133

Thanks for your input guys. I'll borrow some diagnostics next week and see what comes up.

So, two and a half weeks later. I had a look at the ecu, saw it was encased in a metal cage with sheared off screws and decided not to go there! I'm thinking that the ecu will power up the tank pump in response to a signal from a pressure sensor on the low pressure side of the fuel system. If I'm right, can someone please point me in the general direction of this sensor? Also, with most diesel cars, the pump is triggered when you unlock the door. Is that the case with this particular model? If so, why is it not doing just that? Does this point to the same pressure sensor? I've checked the output on pins 1 and 2 with the door open, shut locked, etc. Nothing changes.

Okay thanks for that Pete. I'll have a look at this tomorrow. I should explain, this car belongs to the charity I work for (we provide mobile changing places for disabled people) and we use it for towing our caravan to events.

Pin 2 has 3.43v Pin 1 has 11.8v

Thanks for the details Pete. I have checked F15 and it's good (5amp). Have also tested the relay and connections and established the following: 1. The fuel pump relay (above the obd port) has permanent live on pin 3 2. With the ignition on, pin 1 is live 3. The relay will activate if pin 2 is connected to a separate earth, with ignition on. 4. Connection to the pump is good and the pump runs if the relay is activated.

Thanks for replying, JR. I have no hard physical evidence, but researching my fuel issues, I keep coming across references to the pump control module. there are photos of said unit sitting on top of the tank access panel and plugged into the top of the pump. Could it be that this is only for petrol engines? Anyway, if it's not there I can't fix it! But I'm not having much luck with the main issue which is the fuel pump isn't running. I fitted a new one and cleaned the tank out (lot of crap in there!), but the new pump doesn't run. I've swapped the relay with an adjacent one, but no joy. Took the relay out and put a jumper across the contacts and the pump runs. But should it run constantly? Is there a control unit, somewhere, that regulates the delivery? If it's the ECU, then it doesn't seem to be doing the job! Sorry, that's a lot of questions, but I'm floundering with this one.

Hello, I'm looking for the fuel pump control module on my 62 plate tdi. It's not on top of the tank nor tucked under the edge of the carpet. The pump harness goes into the sill void and emerges by the bonnet release and I'm pretty sure there's nothing in between. Logic tells me it's going to be somewhere under the dash, but just not seeing anything remotely like it. Any suggestions would be greatly appreciated.

Greetings from deepest Wiltshire. Thank you for letting me join the gang. I have to confess that I've dipped in to the technical forum on several occasions, but not got round to registering. Until now!