Thread: Replacing Td5 fuel pump with Bosch 044 inline pump

Originally Posted by chris m

Hi, thinking of ordering a spare pump for 2000 Defender 110 TD5 from UK,
anyone know the part number?

Chris,
Have a look under Famous Four Products their part # is FF003728
Web: www.famousfour.co.uk
I have used them on and off with good results. Use DHL for freight. My last part arrived in three days. Also have tracking.

Tony

Originally Posted by chris m

Hi, thinking of ordering a spare pump for 2000 Defender 110 TD5 from UK,
anyone know the part number?

Land Rover part numbers for Td5 fuel pump/s are as follows:

Discovery Td5 (white top) p/n WFX000280
Defender Td5 110 (black top) p/n WFX000260
Defender Td5 90 (grey top) p/n WFX000250

The first two are interchangeable if you swap the float assembly.

Have tried many online part dealers over the years and settled for Britcar (UK) Ltd

Hope this helps.

Rgds
Matt

Originally Posted by Blknight.aus

Im still trying to get a pump that can be easily modded into the deefer cradle and meet reliability requirements without costing more than the original unit...

I cant tick all the boxes but I can tick them each individually. (and in one case 2 of them but the pump is worth more than a new tank AND sender/pump unit).

IF you are TRUELY desperate you can do the following.

cut the LP line and put an external EFI petrol pump in that so that you get the LP supply requirement, Cut the HP supply line and place in that a HP fuel pump..

heres some places that list pumps capable of hitting and sustaing the coveted 75 PSI + the flow rate required.

Walbro 255 v Bosch 044...interesting info. - Perth-WRX.com

Fuel Delivery

// WELDON RACING PUMPS // Products: Fuel Pumps

Sorry to grave dig, but I am again having suspect fueling issues, unsure where the air is entering the system, but I have the "gurgling pump" syndrome every start latley. I am investigating the replacment of the TD5 fuel pump with something that appears to be of better quality, and less prone to failing.

From what I can see on RAVE, the only reason for the Dual Stage OEM pump, is so that the filtration is done on the LP side, and the HP side is free to deliver fuel to the rail with minimum restriction.

Now, 2 questions, what sort of pump/filtration system do late model common rail fuel systems use, and at what pressures, and 2nd, WHY does the td5 need to filter on the LP side of things, when a petrol car, wth similar fueling requirments (flow/pressure) can filter on the HP side of things.

Now, RAVE states that the HP side of the fuel pump provides 180Lp/h at around 60 PSI, a Walbro 255 HP version will supply about 200Lph at the required pressure, @ 13.5V, a bosch 040 will supply similar and a aeromotive 340 Stealth slighter higher on both flow and pressure.

The orginal fuel filter would need to be changed to something that can facilitate that sort of flow and pressure, as I doubt the OEM filter would, given that it filters on the LP side.

My biggest gripe for replacing the TD5 pump with an OEM version, is that unless you are buying genuine, the quality and longeivity just doesnt seem to be there, which is junk, as far as im concerned, and even the genuine offering seems frought with early life failure in some cases.

Shoehorning an aftermarket pump into the original carrier really shouldnt be that difficult, maybe? fiddly perhaps. But for a long term fix, perhaps well worth the effort?

Havnt looked at what the V8 D2 uses for an intake pump setup, but perhaps using its setup as a basis for modification could be an option?

Originally Posted by Phat-Customs

Sorry to grave dig, but I am again having suspect fueling issues, unsure where the air is entering the system, but I have the "gurgling pump" syndrome every start latley. I am investigating the replacment of the TD5 fuel pump with something that appears to be of better quality, and less prone to failing.

From what I can see on RAVE, the only reason for the Dual Stage OEM pump, is so that the filtration is done on the LP side, and the HP side is free to deliver fuel to the rail with minimum restriction.

Now, 2 questions, what sort of pump/filtration system do late model common rail fuel systems use, and at what pressures, and 2nd, WHY does the td5 need to filter on the LP side of things, when a petrol car, wth similar fueling requirments (flow/pressure) can filter on the HP side of things.

Now, RAVE states that the HP side of the fuel pump provides 180Lp/h at around 60 PSI, a Walbro 255 HP version will supply about 200Lph at the required pressure, @ 13.5V, a bosch 040 will supply similar and a aeromotive 340 Stealth slighter higher on both flow and pressure.

The orginal fuel filter would need to be changed to something that can facilitate that sort of flow and pressure, as I doubt the OEM filter would, given that it filters on the LP side.

My biggest gripe for replacing the TD5 pump with an OEM version, is that unless you are buying genuine, the quality and longeivity just doesnt seem to be there, which is junk, as far as im concerned, and even the genuine offering seems frought with early life failure in some cases.

Shoehorning an aftermarket pump into the original carrier really shouldnt be that difficult, maybe? fiddly perhaps. But for a long term fix, perhaps well worth the effort?

Havnt looked at what the V8 D2 uses for an intake pump setup, but perhaps using its setup as a basis for modification could be an option?

you're correct on the why and the how of the td5 setup.

common rail diesels typically use a mechanical pump for the rail and supply to the high pressure pump is either by prior priming drawing through a filter or a small lift pump pushing through the same sort of filter.

Doing a one off on your own vehicle with time up your sleeve is definitely doable within the casing of the pump inside the tank. At the time when this thread was started doing it so it was easily and reliably repeatable without potential pitfalls, not so much.

one of the ways I had considered was putting a performance pump up in the engine bay with a day tank which got a constant feed from a high flow LP pump via a filter using the in tank setup from the v8 disco2.


the gurgling in you pump could be one of 2 things the first is the swirl pot emptying out or you're getting combustion gasses blowing past the injectors.

Is there a need for a LP fuel circuit at all?
Why not just the decent intank HP pump?

With a sole in-tank HP pump you'll have to put a filter between the pump and the fuel rail which is not the best solution IMO,

for your gurgling problem, did you replace the air bleed valve in the rear outer port of the filter head(WJN500110)? that would be the first move, then if the symptom persists it's time for ne injector washers(and o-rings)

in the td5 application as designed? yes

did it have to be designed that way? no

the low pressure pump in the td5 style application serves to (in no particular order)
1. provide a positive feed of fuel to the high pressure pump
2. provide an excess of fuel to the high pressure pump to keep the swirl chamber full and to cool the pump
3. provide a low pressure fuel flow through the fuel filter to reduce the chances of filter blow through
4. provide excess fuel flow to allow a continuous progressive total filtration of the fuel in the tank to assist in the reduction of in tank contaminants.

is there better ways of doing it? yes but thats subjective to your definition of the term better. I personally think that with the exception of the design and location of the filter its a reasonable design compromise for the overall requirements of the fuel system.

So I am far from experienced at the TD5 fuel pump but I have had mine out to give it a clean a good while ago.


As far as I am aware when the pump fails, its the high pressure side that fails. Would it not be possible to fit a Bosch 044 or the like inline after the filter. I haven't read about it for a while but from what I can remember the vehicle will still run at idle but doesn't get enough fuel to really drive. I mean if the fuel filtering is already done, what's wrong with making the pressure and flow required after the filter. Providing there was no where that air could be sucked in I guess. I also don't know how well these types of fuel pumps suck or do they only make pressure and need to be fed?


Happy Days