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Old 25-07-2008, 01:52 PM
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Default TD42 Fuel Pump Diagram...power issues

Does anyone have a exploded diagram view of a TD42 fuel pump? I'm particularly interested in the location of the small gauze mess filter which I cant see to find on mine.

I'm having a minor power issue problem which feels like its starving for fuel....only happen when the engine is under heavy load & near full boost...typically in 4th & 5th at 110kph going up hills. It pulls strongly up until it hits around 13psi boost & then between 13 - 14psi is flounders a bit....I can see the boost guage move up & down by about 1/2 a psi & it feels like the car is been buffeted by a strong wind.

Changed the injectors & fuel filter but it hasnt made any difference.

The gauze mesh filter is my next thing to check, other than that any ideas?
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Old 25-07-2008, 02:08 PM
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Sounds to me like you need to fit a low pressure electric lift pump to help fuel delivery
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Old 25-07-2008, 04:36 PM
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Quote:
Originally Posted by GNU
Sounds to me like you need to fit a low pressure electric lift pump to help fuel delivery
possibly, but this problem has only been occuring for a few weeks.
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Old 25-07-2008, 08:06 PM
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Do a google on Bosch / Diesel Kiki VE diesel pumps, you'll find loads of info on the pump and how it works, but repair is not a DIY proposition !

The gauze filter you talk about is under the fuel inlet banjo bolt, do a search here, many posts. Beware though, its not always fitted, or has been removed by some one who doesn't understand diesels.

Just because the problem as just occurred doesn't mean that an electric lift pump wouldnt sort it out. Again search here, some good threads on this subject.

After you've cleaned the gauze filter and still have problems you could try taking it to a diesel specialist and get them to set it up for full boost as it sounds like its not giving the fuel it needs at full boost - does it have an aneroid (boost compensator) fitted ?
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Old 25-07-2008, 08:20 PM
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Quote:
Originally Posted by Tracteur Tom
Do a google on Bosch / Diesel Kiki VE diesel pumps, you'll find loads of info on the pump and how it works, but repair is not a DIY proposition !

The gauze filter you talk about is under the fuel inlet banjo bolt, do a search here, many posts. Beware though, its not always fitted, or has been removed by some one who doesn't understand diesels.

Just because the problem as just occurred doesn't mean that an electric lift pump wouldnt sort it out. Again search here, some good threads on this subject.

After you've cleaned the gauze filter and still have problems you could try taking it to a diesel specialist and get them to set it up for full boost as it sounds like its not giving the fuel it needs at full boost - does it have an aneroid (boost compensator) fitted ?
Thanks for that. I've pulled the banjo bolt off as thats were I thought the gauze filter was, but there was nothing there. Looks like mine was never fitted with one!

Its a standard pump for the Series 3 with an intercooler. The only change I've done is fitted the bigger turbo & had the pump tuned....not sure if a aneroid was fitted to these as standard as not, but I was wondering if it is a possible cause? Can they play up over time?
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Old 25-07-2008, 08:23 PM
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In the workshop manual it shows the wastegate opening pressure as being approx 13 psi so i would assume that what you are feeling (your guage is confirming this) is the wastegate opening (normal)

Regards Don
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Old 25-07-2008, 08:38 PM
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Quote:
Originally Posted by Don
In the workshop manual it shows the wastegate opening pressure as being approx 13 psi so i would assume that what you are feeling (your guage is confirming this) is the wastegate opening (normal)

Regards Don
I Don,

A different wastegate was fitted with the new turbo & is set at 14psi
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Old 25-07-2008, 08:47 PM
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Well in that case you have to get it set up to suit the new config. It could be that the pump is not big enough to supply the fuel you need, or indeed a problem as occured thats limiting it. Is it poss to take it back to the people who tuned it ? They would (should !) know. In these modded set -ups a boost compensator becomes essential.
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Old 25-07-2008, 09:09 PM
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Quote:
Originally Posted by Tracteur Tom
Well in that case you have to get it set up to suit the new config. It could be that the pump is not big enough to supply the fuel you need, or indeed a problem as occured thats limiting it. Is it poss to take it back to the people who tuned it ? They would (should !) know. In these modded set -ups a boost compensator becomes essential.
The pump was set up well over 12 months ago when I changed the turbo. Nothing has changed since other than reg maintenance & filter changes.

Something has recently caused this problem to happen....maybe the aneriod is playing up?
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Old 25-07-2008, 09:12 PM
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If the wastegate is set at 14 psi why do you think that what you are feeling & seeing is not the wastegate

Regards Don
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Old 25-07-2008, 10:26 PM
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Check all the air plumbing for leaks.
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Old 25-07-2008, 11:40 PM
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the pump can wear - it may have worked perfectly 3 months ago but it could now be worn JUST enough to not be able to draw up as much fuel as it used to?
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Old 26-07-2008, 05:52 PM
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Look at basics first. Do you have a fuel restriction, is air getting into the system? Are there any inlet leaks. Get it back to the people who set it up and see on the dyno if its changed.

You need to verify the complaint. Alot of people think they have a problem, we have seen a few that dont have any problem.

Yes pumps can play up, no the pump wont be too small. They are good for 130rwkw.


Andy
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Old 27-07-2008, 08:45 AM
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This is a TD42 Pump in a GQ
Gauze Filter can be found about 20mm under the level of the bolt head.


Nissan Part Number is 14371-R8025A
Bosch Part Number is 14612501016N1
This is from a thread I posted in on outerlimits and was for my GQ, but should be the same on a GU

This "thimble" filter is only about 3-4mm in diameter.
Clean up around the top of the injector pump
Looking straight down from above.
The banjo fitting on the inlet section of the pump is the one that is closest to the front of the engine and has a steel fuel line which runs to it via the gap between the back of the pump and the block. The line that feeds the fitting runs between the pump and the block.
Undo this bolt, and remove it.
There should be enough movement in the banjo fitting to push it clear of the hole it feeds beneath the fitting, or you can just work through the hole in the fitting the bolt came out of (harder).
I have a set of Snap-on dental picks I use for this (I check it every service) but a length of small diameter, stiff wire, with the last 2-3mm bent at right angles should do the same job, or a piece of the stainless backing strip you get when you change your wiper blades is good too ( I save everything)
Now feel down inside the pump, about 15-20mm deep, and try to hook the filter out. It is a stainless gauze filter (approx 3mm deep, 3-4 mm in dia), with a brass ring around the top edge.
Note;I have heard stories that some patrols do not have this filter, but between me and my mates in total we have had 6 TD42's from 89-06, and all of them had this filter.
Clean it out with compressed air and replace it.
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Old 27-07-2008, 04:53 PM
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Quote:
Originally Posted by thepaperboy
This is a TD42 Pump in a GQ
Gauze Filter can be found about 20mm under the level of the bolt head.


Nissan Part Number is 14371-R8025A
Bosch Part Number is 14612501016N1
This is from a thread I posted in on outerlimits and was for my GQ, but should be the same on a GU

This "thimble" filter is only about 3-4mm in diameter.
Clean up around the top of the injector pump
Looking straight down from above.
The banjo fitting on the inlet section of the pump is the one that is closest to the front of the engine and has a steel fuel line which runs to it via the gap between the back of the pump and the block. The line that feeds the fitting runs between the pump and the block.
Undo this bolt, and remove it.
There should be enough movement in the banjo fitting to push it clear of the hole it feeds beneath the fitting, or you can just work through the hole in the fitting the bolt came out of (harder).
I have a set of Snap-on dental picks I use for this (I check it every service) but a length of small diameter, stiff wire, with the last 2-3mm bent at right angles should do the same job, or a piece of the stainless backing strip you get when you change your wiper blades is good too ( I save everything)
Now feel down inside the pump, about 15-20mm deep, and try to hook the filter out. It is a stainless gauze filter (approx 3mm deep, 3-4 mm in dia), with a brass ring around the top edge.
Note;I have heard stories that some patrols do not have this filter, but between me and my mates in total we have had 6 TD42's from 89-06, and all of them had this filter.
Clean it out with compressed air and replace it.
You can use then end of a (BIC) pen as when you push it in slightly turn it and you will find it locks up on the tapper of the pen head. This is the way I was shown buy my mechanic but he's found it only works with a bic pen because of the taper
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Old 06-08-2008, 11:11 PM
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Thanks for the help guys....have finally found the cause of the problem.

The lift sensor on the No1 Injector was faulty. This caused the pump to retard the timing slightly under heavy load (hence why the boost guage moved around a bit & why it felt like it was starving for fuel).

Changed the injector over today & problem all fixed. Even though the pump is basically all mechanical, there are just enough sensors (the no1 injector being one of them) which can play up & cause the timing advance to change.

Something for those with this pump to be wary of!

cheers
Tony
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