Diagnose fuel problems

DJ_Steve · 29th May 2018, 15:55

Ok folks i did post a thread not too long ago regarding an issue i seem to be having which can involve car cutting out. I suspect a fuel prob as car also seems to hesitate at times during acceleration. I have lifted the rear seat today to try and hear the fuel pump but only pump i can audidably hear is the one under the bonnet which can be heard even with bonnet shut. I cant hear anything from in the tank but would i be able to anyway im not sure how the fuel systems work for priming on the 75.

Thanks

T-Cut · 29th May 2018, 18:07

A very noisy UBP is typically an indication that the ITP has failed. The ITP can/should be heard buzzing for a short time when you put an ear to the tank filler hole. Get an assistant to turn on the ignition. If you also experience the quarter tank syndrome, then that's a pretty good sign of ITP failure. There should be no priming necessary.

If you're interested in how it all works, this might be worth a look: (Scroll down to Post 4) https://the75andztclub.co.uk/forum/s....php?p=2529527

TC

DJ_Steve · 29th May 2018, 19:16

Quote:

Originally Posted by T-Cut

A very noisy UBP is typically an indication that the ITP has failed. The ITP can/should be heard buzzing for a short time when you put an ear to the tank filler hole. Get an assistant to turn on the ignition. If you also experience the quarter tank syndrome, then that's a pretty good sign of ITP failure. There should be no priming necessary.

If you're interested in how it all works, this might be worth a look: (Scroll down to Post 4) https://the75andztclub.co.uk/forum/s....php?p=2529527

TC

thanks, car can be run right down to bottom of reserve but to me it seems like hesitation gets worse the lower on fuel car gets hence my querying the pump. i cant hear any noise from the itp

Mike Noc · 29th May 2018, 20:01

Pull the plug off the UBP, and with key to position II listen through the open fuel filler and if you can hear a feint buzzing noise then your ITP is working.

I know you can run your tank down to the bottom of the reserve level but that doesn't prove your ITP is actually running.

I could modify a car to do that with a failed ITP, and someone else may have done it to your car.

DJ_Steve · 4th June 2018, 15:27

just as a quick update on this. i managed to get hold of a cheap second hand pump unit to save the hassle of changing just the pump. took old pump out and its covered in black gunk, some of which still seems to be in the tank. cleared out as much as i could and tried plugging the old pump in outside the tank and confirmed it was completely dead. got the new pump fitted and connected and its working fine now so thats one problem fixed, still got slight hesitation at points but nowhere near as bad and i suspect it may be down to maf which i have plugged back in as a test

Mike Noc · 4th June 2018, 21:51

Worth cleaning the tank out fully and replacing the fuel filter.

Does the gunk look organic? If so could be a case of 'diesel bug'.

More info here: http://www.yachtingmonthly.com/saili...esel-bug-32632

.

marinabrian · 4th June 2018, 22:02

Quote:

Originally Posted by Mike Noc

Worth cleaning the tank out fully and replacing the fuel filter.

Does the gunk look organic? If so could be a case of 'diesel bug'.

Mor info here: http://www.yachtingmonthly.com/saili...esel-bug-32632

Or possibly someone pouring a dose of old lube oil in to disguise red diesel use in the past

I'm going to give Steve a call tomorrow to arrange a ride across to see what's what though

Brian

Mike Noc · 5th June 2018, 06:22

Keep us posted Brian - will be interesting to see what it is.

DJ_Steve · 6th June 2018, 16:28

Quote:

Originally Posted by marinabrian

Or possibly someone pouring a dose of old lube oil in to disguise red diesel use in the past

I'm going to give Steve a call tomorrow to arrange a ride across to see what's what though

Brian

i'm sure i was meant to get a call yesterday

its all good i know things can come up

DJ_Steve · 10th June 2018, 15:04

well got brian round today and we have now discovered the two main problems with car, it needs and injector for cyl1 and new intercooler o rings. so those will be the next things on my list to do.

cheers again for the help brian

29th May 2018, 15:55	#1
DJ_Steve Newbie Rover 75 Saloon Join Date: Jan 2018 Location: sunderland Posts: 21 Thanks: 1 Thanked 2 Times in 2 Posts	Diagnose fuel problems Ok folks i did post a thread not too long ago regarding an issue i seem to be having which can involve car cutting out. I suspect a fuel prob as car also seems to hesitate at times during acceleration. I have lifted the rear seat today to try and hear the fuel pump but only pump i can audidably hear is the one under the bonnet which can be heard even with bonnet shut. I cant hear anything from in the tank but would i be able to anyway im not sure how the fuel systems work for priming on the 75. Thanks

29th May 2018, 18:07	#2
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	A very noisy UBP is typically an indication that the ITP has failed. The ITP can/should be heard buzzing for a short time when you put an ear to the tank filler hole. Get an assistant to turn on the ignition. If you also experience the quarter tank syndrome, then that's a pretty good sign of ITP failure. There should be no priming necessary. If you're interested in how it all works, this might be worth a look: (Scroll down to Post 4) https://the75andztclub.co.uk/forum/s....php?p=2529527 TC Last edited by T-Cut; 29th May 2018 at 18:12..

4th June 2018, 21:51	#6
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: 11,570 Thanks: 3,470 Thanked 3,119 Times in 2,247 Posts	Worth cleaning the tank out fully and replacing the fuel filter. Does the gunk look organic? If so could be a case of 'diesel bug'. More info here: http://www.yachtingmonthly.com/saili...esel-bug-32632 . Last edited by Mike Noc; 5th June 2018 at 06:20..

29th May 2018, 20:01	#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: 11,570 Thanks: 3,470 Thanked 3,119 Times in 2,247 Posts	Pull the plug off the UBP, and with key to position II listen through the open fuel filler and if you can hear a feint buzzing noise then your ITP is working. I know you can run your tank down to the bottom of the reserve level but that doesn't prove your ITP is actually running. I could modify a car to do that with a failed ITP, and someone else may have done it to your car.

4th June 2018, 15:27	#5
DJ_Steve Newbie Rover 75 Saloon Join Date: Jan 2018 Location: sunderland Posts: 21 Thanks: 1 Thanked 2 Times in 2 Posts	just as a quick update on this. i managed to get hold of a cheap second hand pump unit to save the hassle of changing just the pump. took old pump out and its covered in black gunk, some of which still seems to be in the tank. cleared out as much as i could and tried plugging the old pump in outside the tank and confirmed it was completely dead. got the new pump fitted and connected and its working fine now so thats one problem fixed, still got slight hesitation at points but nowhere near as bad and i suspect it may be down to maf which i have plugged back in as a test

5th June 2018, 06:22	#8
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: 11,570 Thanks: 3,470 Thanked 3,119 Times in 2,247 Posts	Keep us posted Brian - will be interesting to see what it is.

10th June 2018, 15:04	#10
DJ_Steve Newbie Rover 75 Saloon Join Date: Jan 2018 Location: sunderland Posts: 21 Thanks: 1 Thanked 2 Times in 2 Posts	well got brian round today and we have now discovered the two main problems with car, it needs and injector for cyl1 and new intercooler o rings. so those will be the next things on my list to do. cheers again for the help brian