C

Cappo

Member

• Aug 23, 2020

• #1

As per the title, does anyone know whether and/or how I can install a high-pressure petrol pump into the tank of a 90 in place of the original?

The reason being, I have a 3.9i installed, which of course requires a higher-pressure fuel supply. At present I have it plumbed with the original lift pump feeding a swirl pot on the bulkhead, and a bulkhead-mounted HP pump feeding the rail from the swirl pot. The HP pump is noisy, and the system feels overly complicated for what I need. Pipes everywhere!

Looking at diesel pumps, they have multiple connections and I believe they use some sort of dual circuit which filters (and perhaps pre-pressurises? I'm not a diesel man at all, sorry! ) the fuel, and I don't want to faff around trying to adapt that to fit. I have a return to the tank already, I just want an HP pump which I can drop into the existing hole in the 90 tank (under the driver's seat).

Any clues please?

TIA.

 

marjon

Well-Known Member

Full Member

• Aug 23, 2020

• #2

We have a 2.0mpi defender which is a petrol injection, I will have a look and try to find specs. I would guess the tank is the same as standard defender.

J

 

C

Cappo

Member

• Aug 23, 2020

• #3

Thanks, hadn't thought of that option!

 

marjon

Well-Known Member

Full Member

• Aug 23, 2020

• #4

This is from the disco manual (don’t have a defender 1 can’t find 1) but details of pump below.


Fuel Pump:
Make/Type ....................................................................... Pump pressure ................................................................. Delivery at 3 bar pressure & 12V ..
See ENGINE TUNING DATA, Information, Engine - Mpi - 2.0 Litre
A.C. Rochester/Electric immersible 3.2 bar
64 litre/h
3.0 æ 0.2 bar
2.3 - 2.5 kgf/cm2
Bosch in-line filter ’canister’ type


J

 

C

Cappo

Member

• Aug 23, 2020

• #5

Cheers for that, I'll see if I can track one down.

 

C

Cappo

Member

• Mar 6, 2021

• #6

Just resurrecting this as I had no luck with the above.

If I went for an in-tank pump for the diesel version, does anyone know:

a. what pressure those deliver?
b. where to get the right hose connectors (they look like some sort of twist-on type?)
c. which connections to use (feed & return) and how to disable the other two?

Thanks all.

 

A

Andy J

Active Member

• Mar 6, 2021

• #7

Hi, I'm no expert on Diesel but I thought the pressure came from the injector pump, not the lift pump

 

C

Cappo

Member

• Mar 6, 2021

• #8

Andy J said:

Hi, I'm no expert on Diesel but I thought the pressure came from the injector pump, not the lift pump

Click to expand...

No, I'm no expert either! But I thought the in-tank pump for the diesels supplied the full pressure to the injectors/rail? I could be wrong.

 

Cavey_P38

Well-Known Member

Full Member

• Mar 6, 2021

• #9

The diesel 200 /300tdi engine in defender the fuel is pumped by the Fuel Injection Pump, it is also fitted with a lift pump.

Neithr of these are in the tank

Believe either td5 or puma engine use and in tank pump, am sure some one will be along in a bit to confirm or add to this..

 

cappers

Well-Known Member

• Mar 6, 2021

• #10

@Cappo

When I converted my 90 2.5P to a 3.5V8 I used an in-tank high pressure unit for a Range Rover Classic - PRC8318.
The rubber tube (EFi grade) and bracket needed extending about an inch to reach the bottom of the tank.
I have a separate sender (two-hole tank) from the 2.5.

My tank isn't the original for a 2.5P (NRC9225 with external pump), I think from the parts book it's the later NTC2088 with in-tank low pressure carb pump PRC7019 from VIN 243343.

Has worked perfectly for the past 3 years.

capo

 

C

Cappo

Member

• Mar 6, 2021

• #11

@Cavey_P38 yes, sorry, I should have said it was the TD5 pump I had in mind.

 

R

resto_d1

Well-Known Member

• Mar 6, 2021

• #12

Td5 is high pressure and the specs of the fuel system are in RAVE. I’m pretty sure it draws fuel into a chamber at low pressure then outputs it at high pressure. I can check my rave if you haven’t got it? I only read this up last year and already forgotten it lol

 

R

resto_d1

Well-Known Member

• Mar 6, 2021

• #13

Oh and the connectors are colour coded little plastic insert things that latch into the socket if you get me.

Pump runs at 4 bar. The regulator maintains this and should it be exceeded it diverts off through the fuel cooler and comes back to the tank

 

jamesmartin

Well-Known Member

• Mar 6, 2021

• #14

Cappo said:

As per the title, does anyone know whether and/or how I can install a high-pressure petrol pump into the tank of a 90 in place of the original?

The reason being, I have a 3.9i installed, which of course requires a higher-pressure fuel supply. At present I have it plumbed with the original lift pump feeding a swirl pot on the bulkhead, and a bulkhead-mounted HP pump feeding the rail from the swirl pot. The HP pump is noisy, and the system feels overly complicated for what I need. Pipes everywhere!

Looking at diesel pumps, they have multiple connections and I believe they use some sort of dual circuit which filters (and perhaps pre-pressurises? I'm not a diesel man at all, sorry! ) the fuel, and I don't want to faff around trying to adapt that to fit. I have a return to the tank already, I just want an HP pump which I can drop into the existing hole in the 90 tank (under the driver's seat).

Any clues please?

TIA.

Click to expand...

rrc pump

oops already said

 

Last edited: Mar 6, 2021

C

Cappo

Member

• Mar 7, 2021

• #15

@capo This has good potential! Could be exactly what I have been looking for. For £25 I'll certainly give it a go. I can't imagine that the pressure requirements are much different between the 3.5 EFi and the 3.9, and from memory my tank also looks like that (I'll check tomorrow). I bought my car as a 3.5 on carbs and the V5 said it was a V8 3500, but I do suspect it never came out of the factory like that. With the 3.9 and the auto and all the mods it needed for that, the insurance co have a mod list as long as their arm now anyway!