re not going below Diesel 1/4 tank.

smudge.g · 24th June 2018, 10:18

Morning,
I've read the suggestions about not dropping below the 1/4 tank level with the diesel but I just wanted to ask whether any potential pump damage can be done with continuous usage below that level or only if I inadvertently drop below 1/4 just once, would this lead to possible pump damage? Is this a design flaw that Rover knew of and does the low fuel level warning light come on well below this level?? Thanks for reading.

75c · 24th June 2018, 10:21

As far as I understand it it's a precaution not a rule and it only really applies to mk 1 diesels as the mk 2 doesn't have an under bonnet fuel pump.

When the under bonnet pump fails, if the car has less than a quarter of a tank in it, it will struggle to start.

Ennine · 24th June 2018, 10:31

Quote:

Originally Posted by 75c

As far as I understand it it's a precaution not a rule and it only really applies to mk 1 diesels as the mk 2 doesn't have an under bonnet fuel pump.

When the under bonnet pump fails, if the car has less than a quarter of a tank in it, it will struggle to start.

Only some mk2's do not have the under bonnet pump. Many do have.

Mike Noc · 24th June 2018, 11:04

With everything working as it should you can go below the quarter tank level as often as you want.

If your in tank pump has failed then at around the quarter tank mark the UBP will start sucking air as the fuel level drops below the normally open vent valve on top of the ITP.

Of course if you never let the tank go below a quarter full then, unless you check the ITP, you won't know whether it is working or not.

Mike Noc · 24th June 2018, 11:07

Quote:

Originally Posted by 75c

When the under bonnet pump fails, if the car has less than a quarter of a tank in it, it will struggle to start.

If the under bonnet pump fails, the car won't start at all, no matter how much fuel is in the tank.

smudge.g · 24th June 2018, 11:43

Thanks for the replies guys! Just wanted to be sure as I have a longish commute and at night (I start at 2359), we dont have petrol stations open!

DMGRS · 24th June 2018, 14:51

Quote:

Originally Posted by Ennine

Only some mk2's do not have the under bonnet pump. Many do have.

I collected data on this with the cars I've seen and worked on - seems to be about 15% of Mk2s have both, and 85% only have the one.

The later system was fitted to my 04 plate 75 Tourer, so the changeover was quite early into Mk2 territory.
Some will have been late registered, hence the few 54s out there with the early system.

75c · 24th June 2018, 16:35

Quote:

Originally Posted by Ennine

Only some mk2's do not have the under bonnet pump. Many do have.

Every day is a school day, thanks! None of the facelifts I've had had one. I don't do derv now so it won't affect me in the future but it's always good to learn

Comfortably Numb · 24th June 2018, 16:43

I can only get around £40/30L of diesel between red light coming on and fuel station pump shut off, even if I fill the last bit slowly after the first shut off (around 1litre). Any clues - bent float? Consequently, I regularly let the red light come on before looking for a fillup, as there must still be several gallons left in the tank.

macafee2 · 25th June 2018, 17:34

for those of us that don't know can someone post a picture of the set up with 2 pumps and only one?

thanks

macafee2

24th June 2018, 10:18	#1
smudge.g Gets stuck in 75 Tourer CDTi Connie SE Join Date: Jun 2017 Location: Keith, Banffshire Posts: 686 Thanks: 431 Thanked 132 Times in 105 Posts	re not going below Diesel 1/4 tank. Morning, I've read the suggestions about not dropping below the 1/4 tank level with the diesel but I just wanted to ask whether any potential pump damage can be done with continuous usage below that level or only if I inadvertently drop below 1/4 just once, would this lead to possible pump damage? Is this a design flaw that Rover knew of and does the low fuel level warning light come on well below this level?? Thanks for reading. __________________ My 75 Tourer CDTi was born Saturday, 21st June 2003 @ 09:50 My 75 was the 18,749th 75 Tourer to run off the production line, out of 27,407 It was the 195th 75 Tourer CDT Connoisseur SE (135) to be made out of 2,074 and the 1,789th 75 Tourer in Wedgewood Blue Metallic (code: JEL) to be made out of 1,871 Wedgewood Blue Metallic 75 Tourers

24th June 2018, 11:43	#6
smudge.g Gets stuck in 75 Tourer CDTi Connie SE Join Date: Jun 2017 Location: Keith, Banffshire Posts: 686 Thanks: 431 Thanked 132 Times in 105 Posts	Thanks for the replies guys! Just wanted to be sure as I have a longish commute and at night (I start at 2359), we dont have petrol stations open! __________________ My 75 Tourer CDTi was born Saturday, 21st June 2003 @ 09:50 My 75 was the 18,749th 75 Tourer to run off the production line, out of 27,407 It was the 195th 75 Tourer CDT Connoisseur SE (135) to be made out of 2,074 and the 1,789th 75 Tourer in Wedgewood Blue Metallic (code: JEL) to be made out of 1,871 Wedgewood Blue Metallic 75 Tourers

24th June 2018, 10:21	#2
75c Gets stuck in Rover 75 Saloon Join Date: Feb 2018 Location: Belfast Posts: 601 Thanks: 150 Thanked 294 Times in 190 Posts	As far as I understand it it's a precaution not a rule and it only really applies to mk 1 diesels as the mk 2 doesn't have an under bonnet fuel pump. When the under bonnet pump fails, if the car has less than a quarter of a tank in it, it will struggle to start.

24th June 2018, 11:04	#4
Mike Noc This is my second home Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4. Join Date: Jul 2009 Location: Hampshire Posts: 11,547 Thanks: 3,470 Thanked 3,119 Times in 2,247 Posts	With everything working as it should you can go below the quarter tank level as often as you want. If your in tank pump has failed then at around the quarter tank mark the UBP will start sucking air as the fuel level drops below the normally open vent valve on top of the ITP. Of course if you never let the tank go below a quarter full then, unless you check the ITP, you won't know whether it is working or not.

24th June 2018, 16:43	#9
Comfortably Numb Posted a thing or two Rover 75 Saloon Join Date: Dec 2017 Location: Penrith Posts: 1,336 Thanks: 165 Thanked 303 Times in 241 Posts	I can only get around £40/30L of diesel between red light coming on and fuel station pump shut off, even if I fill the last bit slowly after the first shut off (around 1litre). Any clues - bent float? Consequently, I regularly let the red light come on before looking for a fillup, as there must still be several gallons left in the tank.

25th June 2018, 17:34	#10
macafee2 This is my second home Rover 75 Saloon & Tourer Join Date: Sep 2012 Location: Lincoln Posts: 14,912 Thanks: 1,630 Thanked 3,032 Times in 2,181 Posts	for those of us that don't know can someone post a picture of the set up with 2 pumps and only one? thanks macafee2