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3 WIRE INJECTOR PUMP 300TDI


JimAttrill
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We are busy fitting a disco 300 tdi engine to a Falcon Defender, but alas, we found that the injector pump is the 3 wire version, and not a single wire like a Defender.

We took of the cover and found one wire going into the pump but there is also a sort of magnetic coil thingie.

How do we wire it up ? Or do we fit a fuel solenoid from a defender ??

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I didn't know there was a 3 wire version, unless its an EDC (electronic diesel control) pump? they have a load of electrical garbage on the pump and AFAIK won't run without the associated ECU etc.

If it just has the EGR sensor on the pump and is otherwise a normal non-electronic pump then I should forget about that and disable the EGR system just leaving the feed to the solenoid. I'm afraid I don't have either an EGR or an EDC pump handy to check or take photos of though, there are very few of either type here.

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It does have the EGR which we will throw away, of course. The throttle potentiometer we just leave as is. I reckon we will just put some power on one of the wires and see what happens. What does the electronic Disco pump look like? Unfortunately we had one in a few weeks ago, it was a personal import as they were never sold here AFAIK. I should have looked at it more carefully, I suppose.

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The electronic pump has a lot more rubbish on the top of it, in fact I seem to remember you can hardly see the pump at all.

Anybody on here (from UK) got a late 300Tdi auto they could take a photo of the injector pump?

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The electronic pump has a lot more rubbish on the top of it, in fact I seem to remember you can hardly see the pump at all.

Anybody on here (from UK) got a late 300Tdi auto they could take a photo of the injector pump?

Seems to me like you have a late 300tdi from a Discovery that did not have a spider. As I understand it the weak point with the anti theft systems with the spider was that it was possible to hot wire the start/stop solenoid on the pump. Therefore they introduced the three wire one, which could not be hot wired so easily. I believe one wire is negative, one is positive, and the other is some sort of signal to operate the solenoid. As yet I don't know what that signal is. One day I will take the 'scope to my car to check. To complicate matters I believe the parts are held to the pump with tamperproof screws that have to be drilled out. Was this true for yours?

Ian

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Sorry if this has been covered (didn't read all the replys).

The 3 wires are 12v+(ignition) earth and immobiliser signal.

Throw the component with 3 wires to it, away. Attach the 12v+ignition feed to the top of the solenoid (where the original single wire went).

Job done. ;)

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  • 1 year later...
It does have the EGR which we will throw away, of course. The throttle potentiometer we just leave as is. I reckon we will just put some power on one of the wires and see what happens. What does the electronic Disco pump look like? Unfortunately we had one in a few weeks ago, it was a personal import as they were never sold here AFAIK. I should have looked at it more carefully, I suppose.

Just changed a 3 wire injector pump from a 98 disco for the the earlier version, single wire to solenoid, using a circuit tester find which of the 3 wires has a live feed when ignition switched on and connect that to the solenoid and presto all is fine, did all of this in a field at billing LR show.

egards

Keith

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  • 11 years later...
  • 2 years later...
  • 2 weeks later...
On 9/3/2022 at 12:46 PM, Malikhosein1 said:

Hi there has anyone ever converted a 300tdi edc injector pump to operate as a manual pump.

I actually need a manual injector pump but cant source one here in trinidad

 

Generally swapped - although god knows why as the EDC pump is far better

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