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

Reply
 
Thread Tools Display Modes
Old 30th October 2019, 19:20   #1
Rick-sta
This is my second home
 
Rick-sta's Avatar
 
MG ZT 2.0 CDTI+ in Typhoon, MG TF 135 in Typhoon & Rover 75 Connoisseur CDTI SE in Pearl Black

Join Date: Oct 2012
Location: Norfolk
Posts: 7,523
Thanks: 2,718
Thanked 2,827 Times in 1,462 Posts
Default £20 of petrol in a diesel ZT

A mate of mine has just accidently put £20 worth of petrol in his recentlg acquired diesel zt. Am i right in thinking if he fills the rest of the tank with diesel to dilute the petrol he'll be ok? Sure ive read that on here before if you accidently put a bit of petrol in a diesel 75 or zt.

Cheers
__________________
How to retrofit Cruise Control on a diesel with no OEM wiring in place: Link
How to retrofit heated electric memory seats with no OEM wiring in place: Link
How to operate FBH and ATC via text Link
How to restore cloudy projector headlights Link
Rick-sta is offline   Reply With Quote
Old 30th October 2019, 19:27   #2
markypicks
Gets stuck in
 
markypicks's Avatar
 
rover 75 saloon cdt club se re map 160 bhp

Join Date: Dec 2018
Location: sheffield
Posts: 558
Thanks: 227
Thanked 169 Times in 135 Posts
Default

my uncle has got a nissan qashqai and he did about 15 quids worth iof petrol in his deisel so he filled his tank full of diesel and it was ok . he actually said it run a little better but its up to your mate . i would personally try and drain it via a tube into tank rgds mark

Last edited by markypicks; 30th October 2019 at 19:30..
markypicks is offline   Reply With Quote
Old 30th October 2019, 19:29   #3
Mickyboy
SERVICING AND DEALER DIAGNOSTICS
 
Mickyboy's Avatar
 
MG ZT CDTI 135 + & MGZT CDTI AUTO 160 & ROVER 75 TOURER CDTI 160 TROPHY YELLOW

Join Date: Aug 2013
Location: Hernebay
Posts: 4,331
Thanks: 818
Thanked 2,414 Times in 1,141 Posts
Default

Hi Rick, I was working on a customers car the other day who put £25 worth of unleaded in, then a couple of days later he rang me up as his under bonnet pump was leaking, it’s not really rocket science to work out why all of a sudden that started leaking, the mix of petrol in diesel acts as a solvent, and thus starts reducing lubrication and causing damage to the pump as the metal parts come into contact and rub together.
If your friend has put in £20 worth of petrol, I guess that’s approximately just under 17 L that’s not good, also as you know mate I know a thing or two about diesel injectors, and they won’t like it,
Mick
__________________
[SIGPIC][/SIGPIC]
T4 Owner
Jobs done : new UBP, Spy hole mod, Rear hub(wheel bearing),plenum cleaned and emptied, Inline thermostat fitted,Full service, In car Digital tv/DVD Bluetooth Satnav etc, Replaced UBP, Restored headlights,Fixed airbag connection.replaced HP pump,replaced rear light seals,changed intercooler O rings.

Jobs to do: ,replace drivers lock,.
[/SIZE]
Mickyboy is offline   Reply With Quote
Old 30th October 2019, 19:29   #4
Mr bountyfull
Gets stuck in
 
MGZTV8

Join Date: Aug 2008
Location: Newbury
Posts: 567
Thanks: 173
Thanked 82 Times in 58 Posts
Default

Hello

I have seen (I think AA) state that 1/10 ratio can be passed with normally no damage. I have done this myself and got away with it. However £20 is a 1/4 ratio roughly so I would get it pumped out. You can put 12 on the under bonnet pump and draw it through into a suitable container until you get it down to the 1/10 by adding the balance of diesel before running the car again.
Mr bountyfull is offline   Reply With Quote
Old 30th October 2019, 19:31   #5
stevestrat
This is my second home
 
ZT260 #243 (resting)

Join Date: May 2010
Location: Prestonpans
Posts: 22,424
Thanks: 650
Thanked 4,624 Times in 3,358 Posts
Default

Quote:
Originally Posted by markypicks View Post
i would personally try and drain it via a tube into tank rgds mark
There's an anti syphon trap in the filler.
__________________
Steve


T4 Location Map
stevestrat is offline   Reply With Quote
Old 30th October 2019, 19:34   #6
Odd Job
Gets stuck in
 
Odd Job's Avatar
 
MG ZT 2.0 cdti

Join Date: Aug 2019
Location: Derby
Posts: 909
Thanks: 298
Thanked 191 Times in 149 Posts
Default

A tough one to call.

If it was a more modern diesel I'd say straight away, drain off. Better to be safe than sorry.
But if he can brim it with diesel, and only uses it on slow runs, not fast motorway type of journeys then he might get away with it.

£20 doesn't buy much fuel these days, so I'd get my pen and paper out and calculate how much has actually gone in. Then make a decision on how the car gets used.
If he decides to risk it, make sure he changes the fuel filter after he's run the bad fuel through and is running back on derv.
__________________
….And the latest thing to break is.....


### MG STANDS FOR "MY GREMLIN" !!!
Odd Job is offline   Reply With Quote
Old 30th October 2019, 19:43   #7
trikey
Premium Trader
 
trikey's Avatar
 
Rover 75

Join Date: Nov 2010
Location: Devon
Posts: 33,714
Thanks: 8,837
Thanked 14,831 Times in 8,030 Posts
Default

That's a little too much to get away with Rick, whip the pump cover off the tank and drain out as much as possible then refill to the brim.
__________________
Lest we forget..
trikey is online now   Reply With Quote
Old 30th October 2019, 19:43   #8
Mickyboy
SERVICING AND DEALER DIAGNOSTICS
 
Mickyboy's Avatar
 
MG ZT CDTI 135 + & MGZT CDTI AUTO 160 & ROVER 75 TOURER CDTI 160 TROPHY YELLOW

Join Date: Aug 2013
Location: Hernebay
Posts: 4,331
Thanks: 818
Thanked 2,414 Times in 1,141 Posts
Default

Quote:
Originally Posted by Odd Job View Post
A tough one to call.

If it was a more modern diesel I'd say straight away, drain off. Better to be safe than sorry.
But if he can brim it with diesel, and only uses it on slow runs, not fast motorway type of journeys then he might get away with it.

£20 doesn't buy much fuel these days, so I'd get my pen and paper out and calculate how much has actually gone in. Then make a decision on how the car gets used.
If he decides to risk it, make sure he changes the fuel filter after he's run the bad fuel through and is running back on derv.
Okay we can take this as a calculation then 1.23 per litre x 16.26= £19.98, so as I said earlier he has put in just under 17 L, further to that from testing that I have done in the past I have found that Given the large difference in flash point temperature between petrol and diesel, it doesn’t take very much petrol to depress the flash temperature significantly. As little as 1% petrol contamination will lower the diesel flash point by 18 degrees C. This means the diesel fuel will Prematurely ignite, and that’s not the sort of thing that you want, I Hope that’s a clear enough explanation.
What Andy has suggested above is the simple and easiest solution that’s what I would be doing
Mick
__________________
[SIGPIC][/SIGPIC]
T4 Owner
Jobs done : new UBP, Spy hole mod, Rear hub(wheel bearing),plenum cleaned and emptied, Inline thermostat fitted,Full service, In car Digital tv/DVD Bluetooth Satnav etc, Replaced UBP, Restored headlights,Fixed airbag connection.replaced HP pump,replaced rear light seals,changed intercooler O rings.

Jobs to do: ,replace drivers lock,.
[/SIZE]
Mickyboy is offline   Reply With Quote
Old 30th October 2019, 19:45   #9
M17TT
Banned
 
MG ZT

Join Date: Dec 2014
Location: Potters Bar
Posts: 151
Thanks: 4
Thanked 51 Times in 23 Posts
Default

Hi, it was me that did it. Fuel tank was empty and put £20 in at around £1.25 per litre. Drove about half a mile before I realised and switched off and got recovered home.
M17TT is offline   Reply With Quote
Old 30th October 2019, 19:50   #10
trikey
Premium Trader
 
trikey's Avatar
 
Rover 75

Join Date: Nov 2010
Location: Devon
Posts: 33,714
Thanks: 8,837
Thanked 14,831 Times in 8,030 Posts
Default

Quote:
Originally Posted by M17TT View Post
Hi, it was me that did it. Fuel tank was empty and put £20 in at around £1.25 per litre. Drove about half a mile before I realised and switched off and got recovered home.
Get some diesel in as soon as you can, I fear the HP pump seals will have suffered but its not the end of the world.
__________________
Lest we forget..
trikey is online now   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 10:52.


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