Thread: V8 Discovery Fuel Pump Prob

Originally Posted by Blknight.aus

Heres how I did it..

1. figure out fuel pressure is dodgy but volts and amps to pump are ok so it must be the pump.

2. go buy $500 odd pump in carrier ready to go

3. install it before the old one dies and put the old one on the passanger seat to be left there cause you keep forgetting to throw it out, make sure you do this during a stifling sydney summer. (to change, remove rear carpet, remove floor acces plate, undo all connections, undo big nut change over pump carrier and reverse all previous)

4. one day when remebering to throw it out accidently drop it so it falls apart on your (or your friends) pebble crete driveway.

5. seeing as its broken develop instantaneous curiosity as to what makes it tick and put everything else back in the rover, take the now semi apart pump and carrier to the garage and tinker

6. when SWMBO gets mad cause you are late leave it there for a week, go get ready, standby for abuse cause the passanger seat is covered in crap, remove crap, go get a towel to put over the now greasey passanger seat cover so she doesnt get her dress dirty and make profuse apologies on your way to the dinner.

7. a week later pull the little cylindrical pump out of the plastic casing and realise that it looks like every other intank EFI pump youve ever put in a holden.

8. goto your mate at supercheap or repco and ask real nice if you can open lots of his fuel pump boxes till you find one that fits a, the carrier and b, has the right sort of outlet to take the plasticy hose that makes it to the top of the carrier

9. bodge the wiring after assembly, put the thing in greaseproof paper, then into a box, wrap this in a bit of gaffa tape, label it, carry it everywhere and wait for the current pump to let go which it never will cause you now have a standby pump to fit in under 30 mins if you have to.

10 cop abuse from swmbo for the shoebox size part that you carry with you JIC that is taking up precious shopping storage room in the back.

11. try to work out how to justify 2 44 gallon drums of fuel as "critical spare fuel" to further limit her shopping spreees..


In all seriousness, buried in my box of goodies i have a "was sort of still working fuel pump from a 95 3.9v8, when my gear gets out of storage I'll get the numbers off of it.

Hmmm......that's pretty close to how I'd do it too actually!

Guys, I've been through this too (about a week after I bought the vehicle). Mine's a '96 3.9 V8 SI disco, btw.

I priced a replacement pump from the parts suppliers I know of locally and was a bit awe-struck by the price. I ended up talking by e-mail to a very helpful lady called Mandy at JB LandRovers in the UK (sales@jblandrovers.co.uk) who was able to supply me with a new pump assembly for $AU250 including freight - a little cheaper than the Oz prices as I recall. In fact the genuine LR part was £GB311.00 and a "patterned" part (made in Cardiff) £GB86.00 with post & packing at £GB20 in Aug 2005 to give you a rough guide on price. (I chose the Welsh part and Mandy was able to avoid charging me the VAT after some initial uncertainty - it's a bit of a paperwork nightmare I gather, but quite legal for export.)

There was a drama getting the right part with a flying lead on the end of the pump motor - the original part number was PRC9409 and is now a "classic part" & has been removed from service. I've just checked the box of the replacement part and the Rover part No is PRC9668. The BM (supplier) part no is PRC8499.

I was only able to buy the whole pump assembly with gauge sender and frame - no-one seems to be able to supply the pump only, and this makes the Holden pump look quite attractive. When I researched this I was led to believe that different pumps run at different pressures and flow rates, and you should look for a match in terms of both as well as size & shape, when substituting, but since you guys report that the VN Commodore pump works, I guess that's the proof of the pudding, as it were.

In fact I ended up removing the pump motor from the the new (plastic) assembly and fitting it to the old (steel) assembly as it seemed a bit more robust. It wasn't a big drama to swap the pumps (the hardest bit was unclipping the bowl off the bottom of the new one as I needed to get 3 clips pressed at once and, not coming from near Chernobyl, I only have 2 hands). The job involved a bit of soldering and the judicious use of heat-shrink sleeving as the connector on the end of the motors was different. See the photo below which shows the new pump assembly with the old pump motor at left which may help you understand what you're up against.

If you buy a new pump, buy the rubber sealing ring for the tank entry at the same time.

Remember that the pump only runs until it has pressurised the fuel rail and then shuts off until the injectors draw fuel off the rail. So it is normal for it to run for a short time then stop when you turn the key to ignition without starting the engine. (This is handy when running on LPG as the pump doesn't wear itself out but fuel is available to injectors immediately on changeover!)

I'll be interest to hear if anyone can confirm that the Commodore pump has the same characteristics as the Landy one - it has to be a much cheaper alternative.

Good luck - I'll be interested to watch your progress!

I remember thinking
"what idiot puts live wires inside a fuel tank?"

me apparently


swapped in a second hand commodore unit,,
(good manners tells me not to mention the price here)
5 years down the track,, no problems

Originally Posted by GrahamH

I'll be interest to hear if anyone can confirm that the Commodore pump has the same characteristics as the Landy one - it has to be a much cheaper alternative.

Good luck - I'll be interested to watch your progress!

From memory it doesnt its got a little better flow rate but the delivery pressure is on spec which is the important part...

But its over 9 years ago since I found this stuff out and researched it. 90% of the real sized holdens with intank pumps run the same pump unless you have something exotic that drinks fuel like theres not going to be a tomorrow

Originally Posted by byron

Was that a straight "swap".....or did you need mods?......how did you do it?

Not quite a straight swap. As noted by Blknight, the electrical connections were different but it was easy to do. The pump itself looked identical and fitted straight into the carrier. I'm pretty sure it was a VN pump. I have the details at home.

Ron

I went with the external pump because A: I had it and B: My Rangie doesn't have the access hole in the floor.

Originally Posted by BigJon

I went with the external pump because A: I had it and B: My Rangie doesn't have the access hole in the floor.

Mine didn't originally but John Davis Motorworks had fitted one for the previous owner.

Ron

old post now - over 2 years old!!!

Here's my install of a VL pump to an EFI Rangie

http://www.aulro.com/afvb/showthread.php't=18954

HTH

LRH