Go Back   The 75 and ZT Owners Club Forums > The 75 and ZT Owners Club Forums > Technical Help Forum
Register FAQ Image Gallery Members List Calendar Mark Forums Read
Notices

Reply
 
Thread Tools Display Modes
Old 6th November 2014, 01:29   #1
twowheelstony
Regular poster
 
twowheelstony's Avatar
 
75 v6(broken) , 02 75 2.0 cdt1 05 cdti,03 cdti

Join Date: Nov 2012
Location: trim
Posts: 44
Thanks: 17
Thanked 4 Times in 4 Posts
Default noisy front fuel pump and iffy starting on diesel 75

The fuel pump beside the diesel filter on my 75 is making a humming noise and vibrating a lot .sometimes the car doesnt want to start . Is this a sign that the pump in the tank is giving up ? How do you know if its goosed ? Mrs is giving out about reliability on the car now lol.
twowheelstony is offline   Reply With Quote
Old 6th November 2014, 02:51   #2
RogerHeinz57
I really should get out more.......
 
RogerHeinz57's Avatar
 
A Reasonably Priced Car

Join Date: Jan 2014
Location: Burton Latimer
Posts: 2,530
Thanks: 408
Thanked 1,064 Times in 712 Posts
Default Noisey fuel pump

Sometimes they just make a bit more noise however if the engine is reluctant to start together with noises, its a sure thing your in for some spending. How much depends on a couple of facts, they are-
Is the in tank pump working? this is tested by opening up the fuel filler cap, putting the ignition onto position 2 and listening to the filler neck of the tank to detect a buzzing and or swirling noise, that assumes there is a good amount of fuel inside. If such noises are present, thats a good sign that the tank pump is functioning. If its not, you probably have two pump issues. The engine will run if only the under bonnet pump is functional assuming there is over a quarter of a tank of fuel, this is because the tank has 2 compartments (Divided in the centre by the floor tunnel) The in tank pump delivers fuel from the drivers side to the passenger side, and the under bonnet pump draws the fuel from a port on the passenger side. Thus less than quarter of a tank lets the fuel stay on the wrong side of the outlet port allowing air into the system.
If the under bonnet pump loses pressure or fails, everything grinds to a hault, and then its game over! If the in tank pump failed some time ago this will contribute to the early retirement of the bonnet pump.
Worst case is that both are tired both of mine got replaced with used working parts for around £60 and some time working in diesel, but new gets expensive. DMGRS shop is good and Mat knows his stuff.
Sorry its long winded, but its easier for you to get a good description to best help you.
Cheers John.
RogerHeinz57 is offline   Reply With Quote
Old 6th November 2014, 07:05   #3
Mike Noc
This is my second home
 
Mike Noc's Avatar
 
Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4.

Join Date: Jul 2009
Location: Hampshire
Posts: 11,531
Thanks: 3,470
Thanked 3,119 Times in 2,247 Posts
Default

Quote:
Originally Posted by John H View Post
The engine will run if only the under bonnet pump is functional assuming there is over a quarter of a tank of fuel, this is because the tank has 2 compartments (Divided in the centre by the floor tunnel) The in tank pump delivers fuel from the drivers side to the passenger side, and the under bonnet pump draws the fuel from a port on the passenger side. Thus less than quarter of a tank lets the fuel stay on the wrong side of the outlet port allowing air into the system.
It doesn't actually work like that. The reason the system fails with less than a quarter of a tank of fuel onboard is that the top of the ITP is uncovered as the fuel level drops, and if it isn't running, the self bleeding ball valve on the top of the ITP will be open, so air is drawn in and the UBP can't draw any more fuel out of the tank.

If you look at a TD4 Freelander with the same engine it also has an ITP, but it has a flat bottom tank with no saddle.
Mike Noc is offline   Reply With Quote
Old 6th November 2014, 09:18   #4
twowheelstony
Regular poster
 
twowheelstony's Avatar
 
75 v6(broken) , 02 75 2.0 cdt1 05 cdti,03 cdti

Join Date: Nov 2012
Location: trim
Posts: 44
Thanks: 17
Thanked 4 Times in 4 Posts
Default

Great info lads . Thanks .
twowheelstony is offline   Reply With Quote
Old 26th November 2014, 11:29   #5
twowheelstony
Regular poster
 
twowheelstony's Avatar
 
75 v6(broken) , 02 75 2.0 cdt1 05 cdti,03 cdti

Join Date: Nov 2012
Location: trim
Posts: 44
Thanks: 17
Thanked 4 Times in 4 Posts
Default

A mechanic who was doing the tracking said it sounded like the pump has air in it , can it be bled at the pump ? . It started acting up when I last had the filter off .
twowheelstony is offline   Reply With Quote
Old 26th November 2014, 17:49   #6
DMGRS
Discount MG Rover Spares
 
DMGRS's Avatar
 
Rover 75 CDTi, 2x MG ZS180

Join Date: Jun 2011
Location: Hythe, Southampton
Posts: 11,317
Thanks: 456
Thanked 3,377 Times in 2,027 Posts
Default

They're self bleeding - the circulation of fuel should push any air out of the system.
__________________



Your trusted MG Rover specialist!
Tel: 02380 001133 / Email: [email protected]

We now have a 'chat' function on our site for even quicker replies. Give it a try!

Remember - discount code FORUM5 for 5% off
DMGRS is offline   Reply With Quote
Old 26th November 2014, 20:57   #7
BigRuss
Premium Trader
 
BigRuss's Avatar
 
75 CDT Tourer,2.5 Launch Saloon, Omipro MG/Rover (T4)

Join Date: Jul 2007
Location: Liversedge, West Yorkshire
Posts: 5,405
Thanks: 1,105
Thanked 1,340 Times in 661 Posts
Default

It wouldn't be the first noisy pump I've heard that although still works doesn't intermittently provide enough fuel pressure to start.

If the in-tank pump is working and if not there's plenty of diesel in the car then suspect the under bonnet pump

Of course there's other fuel related issues that can cause poor starting, injector leak-back, collapsed fuel filter, HP fuel regulator for example

Russ
__________________


Replacement Key Service
http://https://the75andztclub.co.uk/...d.php?t=244732
Full T4 Testbook diagnostics available.
Diesel ECU repair and replacement.
Options enabled or disabled as required.
Diesel X-Power 135 and 160bhp, Rover 1.8T 150 to 160
MG 160 V6 to 177 upgrades available
P.M. for details.
BigRuss is offline   Reply With Quote
Old 26th November 2014, 21:38   #8
ninaandphil
Avid contributor
 
ninaandphil's Avatar
 
MG ZT CDTi

Join Date: May 2013
Location: Exford
Posts: 173
Thanks: 49
Thanked 25 Times in 20 Posts
Default

I had exactly the same issues with my diesel a few weeks ago, it was the in tank fuel pump failing. The under bonnet pump was running fine but was noisy, so I changed both. Front one is relatively easy to change, rear one is harder but I did it and am not a mechanic, takes some patience though, quality rear pump about £70, you only need the pump, not the whole assembly it fits into.... front pump about £30, but you can pay more! If you take out the rear pump, make sure you note where the assembly fits into the tank, I didn't and it was only with the help of the pics I got from the pump vendor that I worked it out!!!
ninaandphil is offline   Reply With Quote
Old 26th November 2014, 21:40   #9
trikey
Premium Trader
 
trikey's Avatar
 
Rover 75

Join Date: Nov 2010
Location: Devon
Posts: 33,711
Thanks: 8,837
Thanked 14,831 Times in 8,030 Posts
Default

Quote:
Originally Posted by ninaandphil View Post
I had exactly the same issues with my diesel a few weeks ago, it was the in tank fuel pump failing. The under bonnet pump was running fine but was noisy, so I changed both. Front one is relatively easy to change, rear one is harder but I did it and am not a mechanic, takes some patience though, quality rear pump about £70, you only need the pump, not the whole assembly it fits into.... front pump about £30, but you can pay more! If you take out the rear pump, make sure you note where the assembly fits into the tank, I didn't and it was only with the help of the pics I got from the pump vendor that I worked it out!!!
It's a tricky exercise isn't it
__________________
Lest we forget..
trikey is offline   Reply With Quote
Old 26th November 2014, 21:51   #10
RogerHeinz57
I really should get out more.......
 
RogerHeinz57's Avatar
 
A Reasonably Priced Car

Join Date: Jan 2014
Location: Burton Latimer
Posts: 2,530
Thanks: 408
Thanked 1,064 Times in 712 Posts
Default Iffy starting......

Quote:
Originally Posted by twowheelstony View Post
A mechanic who was doing the tracking said it sounded like the pump has air in it , can it be bled at the pump ? . It started acting up when I last had the filter off .
If this has happened shortly after fuel filter change, maybe worth checking if the seal is ok, the system will self bleed assuming the system integrity is good, if it can draw up air and fuel the engine will strugggle like a bitch.
RogerHeinz57 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 20:56.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright © 2006-2023, The Rover 75 & MG ZT Owners Club Ltd