v8250 · Jan 23, 2020

Dear All, prior to re-installing my 200tdi engine my mind's been scrabbling as to re-install the engine with the manual lifter pump, or, install a 12v constant velocity pump?

Understand there are pro's & con's...but would like to hear from anyone who strongly recommends a little 12v unit instead of the manual unit...

Hicap phill · Jan 23, 2020

On my off road racer I had a facet barrel type electric pump in line before the lift pump.
The lift pump still pulled through the Electric pump(not switched on) and no problems. If we were having problems bleeding the system we just fired up the electric pump.
Ran like this with no problems.

just make sure you get a diesel pump as they have a different (cleanable)filter in them. They have an internal pressure so turn on & off automatically when pressure is required
Best of both worlds

nobber · Jan 23, 2020

The thing about the lift pump is its engine rotational, so , as the engine rotates so does the pump, engine speeds up , so does the pump. Just make sure it can match the pressure at full chat.

zeaphod · Jan 23, 2020

Stick with the standard, you don't want another electrical thing to go wrong. I had to replace the Facet in my V8 several times, it's not a great design. That said, if it can cope with a V8 at 70mph (9MPG), it won't have any problems delivering enough fuel for a 200TDi.

nobber · Jan 23, 2020

zeaphod said:
Stick with the standard, you don't want another electrical thing to go wrong. I had to replace the Facet in my V8 several times, it's not a great design. That said, if it can cope with a V8 at 70mph (9MPG), it won't have any problems delivering enough fuel for a 200TDi.

A diesel injector pump will require a fair amount of pressure, more so than a carb I would have thought?

v8250 · Jan 23, 2020

Thanks Phil/@ highcap phill, I have a long background with FACET pumps, scarily...nearly 26 years[!] My thoughts here, blank off lift pump block area as it's not needed, mount diesel 12v constant velocity 'lift pump' replacement and wire in with manual isolation switch via fused supply. Message understood re' diesel specific...luckily FACET have compact multifuel units including the following + their traditional Red/Blue/Silver/Gold Top types. My objective is flawless reliability over performance

https://www.fuelpumpsonline.co.uk/facet-dura-lift-pumps-1817-c.asp

zeaphod · Jan 23, 2020

nobber said:
A diesel injector pump will require a fair amount of pressure, more so than a carb I would have thought?

I see where you're coming from, but I can't see the little rubber diaphragm standard lift pump producing much pressure. I think its the distribution pump that produces all the high pressure. They will run with fuel supplied from a can held above the engine.

zeaphod · Jan 23, 2020

If you're determined to go with electrical, make sure you get the solid state versions, as per the link above. The older facets had contacts which went out of adjustment and were almost impossible to fix.

nobber · Jan 23, 2020

zeaphod said:
I see where you're coming from, but I can't see the little rubber diaphragm standard lift pump producing much pressure. I think its the distribution pump that produces all the high pressure. They will run with fuel supplied from a can held above the engine.

That little lift pump does move a fair amount of fuel , especially at high revs, send that down a 6mm pipe and its going to deliver. Will then run on gravity pressure down a motorway?

lynall · Jan 24, 2020

v8250 said:
Thanks Phil/@ highcap phill, I have a long background with FACET pumps, scarily...nearly 26 years[!] My thoughts here, blank off lift pump block area as it's not needed, mount diesel 12v constant velocity 'lift pump' replacement and wire in with manual isolation switch via fused supply. Message understood re' diesel specific...luckily FACET have compact multifuel units including the following + their traditional Red/Blue/Silver/Gold Top types. My objective is flawless reliability over performance

https://www.fuelpumpsonline.co.uk/facet-dura-lift-pumps-1817-c.asp

Thats what I did, used a cheap copy facet pump (one of the rubber mounted posi flo jobs) off of ebay, been on a few years now.

lynall · Jan 24, 2020

nobber said:
A diesel injector pump will require a fair amount of pressure, more so than a carb I would have thought?

The Bosch ve pumps have an internal pressure of approx 70 psi, this is created by the internal vane pump, many normal cars have/had the ve pump and had no external lift pump fitted at all.
I have to assume land rover fitted the pump due to the possible off road angles etc and as the block already had the hole might as well use it?

lynall · Jan 24, 2020

Fitted to top of chassis rail right next to tank, not pretty but been fine so far.

v8250 · Jan 25, 2020

lynall said:
The Bosch ve pumps have an internal pressure of approx 70 psi, this is created by the internal vane pump, many normal cars have/had the ve pump and had no external lift pump fitted at all. I have to assume land rover fitted the pump due to the possible off road angles etc and as the block already had the hole might as well use it?

I was thinking the same, even though it's a std closed injection system. Internal pressure at 70psi is good pressure for such an agricultural engine. I'm going to measure/check the pump output pressure, volume & flow rate to correctly match diesel volume required throughout engine range. The head lift from the lifter pump is acting as a 'buffer' pump to ensure constant supply under all conditions...though the head lift is really quite small.

Rougharse Racing · Jan 25, 2020

If you stick with the mechanical pump they are cheap and reliable-ish (no electrical connections to go wrong).
You don't need high pressure to the metering pump, the fuel metering pump itself produces the megga pressure needed for the injectors.

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