I have a leak from the pump top cover and have obtained a new gasket Part No. 1461 015 303 from my local diesel specialists CP diesel in Lincoln. Cost £3.22 inc. VAT.
I'm now needing to be sure which socket I need to undo the wierd-shaped long bolt at the front outer corner of the cover. I've watched the Youtube video, but if he tells us which one it is, I missed it. There is a Neilsen product with 7mm and 12.6mm sockets, of which the 7mm socket might be the one, but there also Audi/VAG sets with 6.5 and 7.5mm sockets, also for Bosch pumps. Who can tell me for sure? Thanks.

to undo the bolt you will need a special socket and mark the pump top lid and the side so you can relive the parts back together as it doesn't take much for it to be out and either run to rich or not rum at all
you will need a 7mm triangular socket to remove the securing screw

karlos01 wrote:

" to undo the bolt you will need a special socket and mark the pump top lid and the side so you can relive the parts back together as it doesn't take much for it to be out and either run to rich or not rum at all
you will need a 7mm triangular socket to remove the securing screw."

Thanks karlos01. I'm only removing the top cover. I believe that it is the next bit down (the actuator, which has elongated screw holes in it) that affects the running of the engine, the gasket there being called the 'positioning gasket'.My understanding is that the top cover (which has small circular holes) only goes on in one position and does not need marking. Only the tamper-proof screw goes through both the top cover and the actuator; the top cover has three short T30 screws into the top of the actuator. Thanks for confirming that the 7mm socket is the one I need. That is what I thought.

JeremyAldermartenQC wrote:

karlos01 wrote:

" to undo the bolt you will need a special socket and mark the pump top lid and the side so you can relive the parts back together as it doesn't take much for it to be out and either run to rich or not rum at all
you will need a 7mm triangular socket to remove the securing screw."

Thanks karlos01. I'm only removing the top cover. I believe that it is the next bit down (the actuator, which has elongated screw holes in it) that affects the running of the engine, the gasket there being called the 'positioning gasket'.My understanding is that the top cover (which has small circular holes) only goes on in one position and does not need marking. Only the tamper-proof screw goes through both the top cover and the actuator; the top cover has three short T30 screws into the top of the actuator. Thanks for confirming that the 7mm socket is the one I need. That is what I thought.

the tamper screw does go through the top and middle sections t30 screws on the top I would still mark both just incase something moves out of line it is a p38 after all lol I marked mine just to be on the safe side

Finally, the weather permitted me to get the job done. 7mm 3-point socket from Neilsen. https://www.ebay.co.uk/itm/203156902462 which was £5.99 but is now £7.99. Gasket 1461 015 303 from local diesel specialist, CP Diesel in Lincoln, £3.22. Very simple job, once the manifold is off. I could have done it without removing the manifold, but it would have been too risky regarding getting dirt in the top of the pump and very awkward. Thanks all.

glad you got it sorted out and back up and running again

Thanks Karlos!