Technical Diesel pump?

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Technical Diesel pump?

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What's the metal box doodah that lives at the back of the JTD engine, at the height of the rocker cover/injectors. It has a metal pipe going into it, and some rubber pipes coming out. Is it the fuel pump?

Mine has had a minor weep for ages (judging by the oily/grease down the back of the engine). It's never bothered me too much up till now (extra rust-proofing for the engine bay.. :D ) and I've just wiped away any collecting oil/diesel every time I have the plastic cover off... but I'm not sure if it's getting worse. I've started getting a whiff of diesel in the car occasionally and this is the only place that I could see that is wet. It may be time to fix it.

Is there a gasket under there that is famous for leaking? If I know what the doodah is, I'll be able to investigate what pieces I need.

Is it then just an unbolt/re-fit.. or is it a bit more complicated than that? The metal pipe looks like a brake pipe so presumably has some pressure inside it?

Ralf S.
 
It's 99% sure a Bosch pump, and has a 10 digit Bosch part number on it.
Those pumps are expensive new indeed...but...Bosch has reconditioned pumps available, and they are as good as new, at about half the cost or less...!
Have a look at www.mister-auto.co.uk , and you'll find them.
A few years ago I found a factory reconditioned Bosch pump for my Alfa GT jtd on ebay.uk for less than 150 gbp...
I bought it, just in case.
 
..or here:

https://www.ebay.co.uk/itm/ALFA-ROM...463738?hash=item2134a9cbba:g:imcAAOSwW6BaKVIS

s-l1600.jpg
 
This post contains affiliate links which may earn a commission at no additional cost to you.
Cheers for the links. :)

When these fail, how do they fail? Mine seems to be working fine but there appears to be a weep or leak around it, which I can live with, and I'm getting a whiff of diesel in the cabin, which I can't.

I'll whip the cover off this weekend to see what's going on.. but if "leaking" is a sign of it about to fail, that's obviously a cue to get a spare one in.

Otherwise if the leak is just a random leak and can be fixed (new hose, tighter clamp etc.) then obviously that would be Plan A.


Ralf S.
 
A small weep wouldn't worry my, try to tighten things, if possible.
When those pumps age and wear, they can't build up enough pressure, and a codelight will go of, indicating this.
Every third fill up, I use a special additive to lubricate the pump, just to be sure.
And I use ONLY premium fuel, BP Ultimate Diesel.
My pump is still doing fine after 250.000 mls...
 
I got to the root of the problem.

There's a small "S" shaped hose that runs from the injector pump to a black plastic box that bolts to the back of the inlet manifold. It's secured by a CLIC clip at each end.

For some reason, the hose at the plastic box end had decided to start leaking. The clip was secure and the hose was not split... but when the engine was running you could see a small drop of diesel escape every few seconds.

The back of the engine is a bit oil-grimed, so it's presumably been weeping out for a while.. but recently it just started dripping and so there was enough loose diesel that I could smell it.

I removed the box (a load of diesel fell out :D ) and the hose .. and then cleaned out the receiver stubs and the pipe ends, before refitting with a dab of instant gasket and a new clip (pinched from the Younger Mrs. S's Cinquecento coolant reservoir, as you do). I must remember to replace it... :D

There's still a slight whiff of diesel .. probably the left-overs of what was split when I removed the plastic box.. but in theory, I should have fixed it. I'll have a check later when it's not raining.


Ralf S.
 
Yes! :)

I was still getting a whiff of what smelt like diesel exhaust but I think that was because the plastic box doodah holds diesel and when I tipped it over to get at the Clic clips, it all ran out and down the back of the engine.

After I dismantled the hoses I cleaned off the area immediately under and around them - on the other hand, the back of the engine and injector pump were too grimy and will need a proper degrease.

When I had a look the next day (after 150-odd miles) the area was still clean and dry, so it looks like it's sorted. :) The diesel exhaust smell has also gradually disappeared.


Ralf S.
 
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