in tank pump - Page 5

Jules · 9th December 2013, 17:19

Could be .
But it could also be your injectors leaking.
Or at that mileage the HP pump itself (or regulator) could be dowqn on Pressure.

T4 diagnostics will tell you what the cranking pressure is, otherwise you're playing in the dark

First_damned · 9th December 2013, 18:48

My cars only got 80k miles on it, is it typical for injectors to fail at that mileage?

I am replacing the Itp as it's not working so hope that cures it

Jules · 9th December 2013, 22:19

I've seen injectors fail from 60k upwards to 160k over the years.
Depends on fuel Brand possibly and how regularly the filter has been changed.

T-cut
Here's the pic of UB innards from my library (July 2007)

As wear takes place of the pump pigtail spirals the O/P pressure reduces for a given RPM so just because the pump is running doesn't mean it's producing the required pressure the HP pump needs.

Again pressure measurement is required for diagnosis (T4 or similar) otherwise it becomes a guessing game of what to replace.

First_damned · 9th December 2013, 23:17

Hi Jules

Thank you for the above message.

I will replace the in tank pump at the weekend and see how that goes, the ubp seems a bit noisey but have been told it's possibly because it's taking the strain of running in its own

DMGRS · 9th December 2013, 23:18

Fantastic picture Jules, I'd often wondered what the inside of a UBP looks like.
Thank you for sharing that.

Mike Noc · 10th December 2013, 07:17

Quote:

Originally Posted by First_damned

My cars only got 80k miles on it, is it typical for injectors to fail at that mileage?

I am replacing the Itp as it's not working so hope that cures it

Not typical but not unknown either. Injectors can last well over 300k miles.

Maybe miss-fueling a car can take years off the service life of the injectors and account for early failures?

Unless you have owned the car from new you can't be sure that it hasn't been miss-fueled in the past.

T-Cut · 10th December 2013, 13:59

Quote:

Originally Posted by Jules

T-cut
Here's the pic of UB innards from my library (July 2007)

That's the one, cheers.

TC

Jules · 10th December 2013, 14:06

I believe the cheap copy pumps (most have black tops) are nothing like this design inside and perhaps why they are all noisier than the OEM

9th December 2013, 17:19	#41
Jules This is my second home ZT 260 SE Twilight and 10 other 75 ZT's :O Join Date: Jan 2007 Location: Conwy NORTH WALES Posts: 11,094 Thanks: 512 Thanked 1,116 Times in 763 Posts	Could be . But it could also be your injectors leaking. Or at that mileage the HP pump itself (or regulator) could be dowqn on Pressure. T4 diagnostics will tell you what the cranking pressure is, otherwise you're playing in the dark __________________ [SIGPIC][/SIGPIC] Newbies do now!! 1. Plenum drains..all 3 or 4 year dependent 2. Cooling fan..All speeds functioning 3. Bonnet cable divider block

9th December 2013, 22:19	#43
Jules This is my second home ZT 260 SE Twilight and 10 other 75 ZT's :O Join Date: Jan 2007 Location: Conwy NORTH WALES Posts: 11,094 Thanks: 512 Thanked 1,116 Times in 763 Posts	I've seen injectors fail from 60k upwards to 160k over the years. Depends on fuel Brand possibly and how regularly the filter has been changed. T-cut Here's the pic of UB innards from my library (July 2007) As wear takes place of the pump pigtail spirals the O/P pressure reduces for a given RPM so just because the pump is running doesn't mean it's producing the required pressure the HP pump needs. Again pressure measurement is required for diagnosis (T4 or similar) otherwise it becomes a guessing game of what to replace. __________________ [SIGPIC][/SIGPIC] Newbies do now!! 1. Plenum drains..all 3 or 4 year dependent 2. Cooling fan..All speeds functioning 3. Bonnet cable divider block

9th December 2013, 23:18	#45
DMGRS Discount MG Rover Spares Rover 75 CDTi, 2x MG ZS180 Join Date: Jun 2011 Location: Hythe, Southampton Posts: 11,320 Thanks: 456 Thanked 3,377 Times in 2,027 Posts	Fantastic picture Jules, I'd often wondered what the inside of a UBP looks like. Thank you for sharing that. __________________ 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

10th December 2013, 14:06	#48
Jules This is my second home ZT 260 SE Twilight and 10 other 75 ZT's :O Join Date: Jan 2007 Location: Conwy NORTH WALES Posts: 11,094 Thanks: 512 Thanked 1,116 Times in 763 Posts	I believe the cheap copy pumps (most have black tops) are nothing like this design inside and perhaps why they are all noisier than the OEM __________________ [SIGPIC][/SIGPIC] Newbies do now!! 1. Plenum drains..all 3 or 4 year dependent 2. Cooling fan..All speeds functioning 3. Bonnet cable divider block

9th December 2013, 18:48	#42
First_damned Posted a thing or two Rover 75 Connoisseur CDTi Join Date: Aug 2013 Location: Birmingham Posts: 1,272 Thanks: 267 Thanked 100 Times in 93 Posts	My cars only got 80k miles on it, is it typical for injectors to fail at that mileage? I am replacing the Itp as it's not working so hope that cures it

9th December 2013, 23:17	#44
First_damned Posted a thing or two Rover 75 Connoisseur CDTi Join Date: Aug 2013 Location: Birmingham Posts: 1,272 Thanks: 267 Thanked 100 Times in 93 Posts	Hi Jules Thank you for the above message. I will replace the in tank pump at the weekend and see how that goes, the ubp seems a bit noisey but have been told it's possibly because it's taking the strain of running in its own