Diesel in-tank pump - quick question ...

Hengist · 4th April 2010, 16:17

Changed the pump unit for a new one.

Should i be hearing it every time i turn the ignition - because I'm not. In fact, I can't recall hearing it since it was new (couple of months ago).

No funny noises from the under-bonnet pump or anything, but lack of noises coming from under the back seat is worrying me a little ...

Angus

James.uk · 4th April 2010, 16:20

If the cars running ok then it must be working. I think you need to be closer to it, i.e. not in the driving seat. Or maybe the battery in your hearing aid needs replacing?

...

T-Cut · 4th April 2010, 16:26

The engine will run with just the under bonnet pump if there's plenty of juice in the tank. Both pumps must be working or the UBP will be stressed and eventually fail. Best way to check the in-tank pump is to lift the rear seat cushion and put your ear to the floor on the driver's side wile your Haynes Assistant turns on the ignition without starting the engine. You should hear the pump humming for a few seconds and then stop.

TC

Hengist · 4th April 2010, 16:32

Wow - you guys are pretty sharp off the mark (unlike the chaps on "the other side" :lol

.

My hearing aid is fine, despite many years of Motorhead concerts and the like.

I've been turning the ignition myself, then zooming round to the pre-opened back door and sticking my lug on the seat, but really not hearing anything at all. Absolutely no problems running the car, though we have been keeping it above 1/4 full just in case. The u/b pump sounds fine.

Maybe I'm going to have to go through the seat-removal PITA again soon to put my mind at rest.

Angus

podge · 4th April 2010, 16:37

To save you running round and round,just pull the connector off the pump,switch just the ignition on and when you are sitting comfortably,lend an ear to the pump as you push the connector back on.

Hengist · 4th April 2010, 17:02

Quote:

Originally Posted by podge

To save you running round and round,just pull the connector off the pump,switch just the ignition on and when you are sitting comfortably,lend an ear to the pump as you push the connector back on.

I guess that would work, thinking about it ... the pump will stop operating once it's primed, and will only start the process once you plug it in, eh?

Good plan, Batman.

Angus

bl52krz · 4th April 2010, 19:36

Quote:

Originally Posted by James.uk

If the cars running ok then it must be working. I think you need to be closer to it, i.e. not in the driving seat. Or maybe the battery in your hearing aid needs replacing?

...

never heard mine running either.even with head right down by rear seat in the quiet of the garage.

foxspeed · 4th April 2010, 21:52

remove fuel cap and listen - you can hear a very high pitch hum from the tank as the pump runs

4th April 2010, 16:17	#1
Hengist Avid contributor MG ZT CDTi Join Date: Mar 2008 Location: New Deer Posts: 225 Thanks: 0 Thanked 20 Times in 2 Posts	Diesel in-tank pump - quick question ... Changed the pump unit for a new one. Should i be hearing it every time i turn the ignition - because I'm not. In fact, I can't recall hearing it since it was new (couple of months ago). No funny noises from the under-bonnet pump or anything, but lack of noises coming from under the back seat is worrying me a little ... Angus

4th April 2010, 16:20	#2
James.uk Passed Away 2002 Pale Blue. Rover 75 CDTi Connoisseur auto. 170K miles Join Date: Dec 2008 Location: Near the M67. Posts: 14,509 Thanks: 199 Thanked 585 Times in 397 Posts	If the cars running ok then it must be working. I think you need to be closer to it, i.e. not in the driving seat. Or maybe the battery in your hearing aid needs replacing? ... Last edited by James.uk; 4th April 2010 at 16:22..

4th April 2010, 16:32	#4
Hengist Avid contributor MG ZT CDTi Join Date: Mar 2008 Location: New Deer Posts: 225 Thanks: 0 Thanked 20 Times in 2 Posts	Wow - you guys are pretty sharp off the mark (unlike the chaps on "the other side" :lol. My hearing aid is fine, despite many years of Motorhead concerts and the like. I've been turning the ignition myself, then zooming round to the pre-opened back door and sticking my lug on the seat, but really not hearing anything at all. Absolutely no problems running the car, though we have been keeping it above 1/4 full just in case. The u/b pump sounds fine. Maybe I'm going to have to go through the seat-removal PITA again soon to put my mind at rest. Angus

4th April 2010, 16:37	#5
podge I really should get out more....... Rover 75 Tourer CDT CLUB SE Copper Red Mica Dec 01 ....now deceased....replaced by2003 Royal Blue T Join Date: Nov 2007 Location: North Warnborough, Hampshire Posts: 2,398 Thanks: 9 Thanked 69 Times in 20 Posts	To save you running round and round,just pull the connector off the pump,switch just the ignition on and when you are sitting comfortably,lend an ear to the pump as you push the connector back on. __________________ 01 75 CDT Club SE Tourer..."The Rover 75 is a British-built car to be proud of." B.M.Ws loss........OUR GAIN!!!!!!!! http://knowledgerush.com/wiki_image/...arp.300pix.jpg http://farm1.static.flickr.com/167/3...b847e1c5_m.jpg

4th April 2010, 16:26	#3
T-Cut This is my second home Rover75 and Mreg Corsa. Join Date: Nov 2006 Location: Sumweer onat mote o'dust (Sagin) Posts: 21,753 Thanks: 341 Thanked 3,660 Times in 2,924 Posts	The engine will run with just the under bonnet pump if there's plenty of juice in the tank. Both pumps must be working or the UBP will be stressed and eventually fail. Best way to check the in-tank pump is to lift the rear seat cushion and put your ear to the floor on the driver's side wile your Haynes Assistant turns on the ignition without starting the engine. You should hear the pump humming for a few seconds and then stop. TC

4th April 2010, 21:52	#8
foxspeed Loves to post rover 75cdt Join Date: Jan 2010 Location: secret airfield near Leeds Posts: 294 Thanks: 0 Thanked 0 Times in 0 Posts	remove fuel cap and listen - you can hear a very high pitch hum from the tank as the pump runs