Fuel pump relay or plenum?! Looks like rain... - Page 4

PMAN01 · 5th April 2021, 11:50

Having spent half the value of the car (almost!) chasing this problem, I wonder at what point does one throw in the towel? Answers on a postcard please!

Lee T · 5th April 2021, 11:53

"In for a penny" springs to mind!

PMAN01 · 5th April 2021, 12:14

lol! Well, I may ‘park’ this problem until I’m wealthy and retired and maybe fix it then.....

Perhaps (yet) another UBP will have to be the last chance saloon throw of the dice. £200 on an ecu and more £’s on other bits and bobs maybe should be topped off with a Pierburg UBP then watch and wait. Only trouble is this is our only car and it is used daily so it can’t be a project; a luxury I can only dream of in keeping an eventual classic car.

Lee T · 5th April 2021, 12:47

I still have my original Pierberg pump somewhere, It failed once but worked for a week with no further problems after a tap on the side, Your welcome to it as a temporary replacement if you'd like. Probably still better than an aftermarket one

PMAN01 · 5th April 2021, 13:00

Well, there’s a gift horse! I do like ‘try before you buy’; at least a temporary swap would (likely) rule out the UBP as the source of my chagrins. Happy to go ahead and pay postage to me so I guess a pm with addresses etc is the next step. Publicly, thank you very much for the offer; if I could try it for a month or two and see how it goes. The prob should surface again in that time.

Lee T · 5th April 2021, 13:08

You have a PM.

MarkS · 5th April 2021, 20:07

Have you tried TOAF ?
See what the car has to say about the intermittent fault.

Mike Noc · 7th April 2021, 12:27

Quote:

Originally Posted by exforces

Are, excuse my ignorance, UBP and HPFP one and the same? I’ve been referring to the cylindrical fuel pump behind the fuel filter.

No they aren't - the HP pump is engine driven and as mentioned the O ring on the fuel pressure regulator that sits on the end of the pump can fail causing exactly the sort of symptoms you are having. Cheap and easy fix so worth checking it out.

PMAN01 · 7th April 2021, 18:46

Well I declare; we have 3 pumps on these cars. Live and learn! As it turns out, Lee T came over from Crosby and in the freezing wind howling up the driveway, I watched as he replaced the newish (leaking!) Magneti Marelli UPB with his Pierburg. He then wanted to satisfy his curious thought that he had the night before re: high mileage I mentioned (nearly 250k) and saw to testing the injectors. Low and behold, 1 and 3 were ok-ish, 2 was dry and fine but 4 spurted fuel. Seemingly it miserably failed the leak back test! Long story short, replaced the injector and we both (after he explained, he’s good at that, about fuel leak back) seem to think it was that all along. Sporadically the check engine light flashed up over the last year or so and this can indicate a failing injector. I’ll report back here of course but for now it’s a waiting game and the usual fingers crossed that a stall doesn’t occur.

5th April 2021, 11:53	#32
Lee T Gets stuck in MG ZT Join Date: Jul 2014 Location: Liverpool Posts: 851 Thanks: 180 Thanked 248 Times in 189 Posts	"In for a penny" springs to mind! __________________ [SIGPIC][/SIGPIC]

5th April 2021, 12:47	#34
Lee T Gets stuck in MG ZT Join Date: Jul 2014 Location: Liverpool Posts: 851 Thanks: 180 Thanked 248 Times in 189 Posts	I still have my original Pierberg pump somewhere, It failed once but worked for a week with no further problems after a tap on the side, Your welcome to it as a temporary replacement if you'd like. Probably still better than an aftermarket one __________________ [SIGPIC][/SIGPIC]

5th April 2021, 13:08	#36
Lee T Gets stuck in MG ZT Join Date: Jul 2014 Location: Liverpool Posts: 851 Thanks: 180 Thanked 248 Times in 189 Posts	You have a PM. __________________ [SIGPIC][/SIGPIC]

5th April 2021, 11:50	#31
PMAN01 Happy to waft not race thanks! Join Date: Feb 2010 Posts: 191 Thanks: 196 Thanked 21 Times in 14 Posts	Having spent half the value of the car (almost!) chasing this problem, I wonder at what point does one throw in the towel? Answers on a postcard please!

5th April 2021, 12:14	#33
PMAN01 Happy to waft not race thanks! Join Date: Feb 2010 Posts: 191 Thanks: 196 Thanked 21 Times in 14 Posts	lol! Well, I may ‘park’ this problem until I’m wealthy and retired and maybe fix it then..... Perhaps (yet) another UBP will have to be the last chance saloon throw of the dice. £200 on an ecu and more £’s on other bits and bobs maybe should be topped off with a Pierburg UBP then watch and wait. Only trouble is this is our only car and it is used daily so it can’t be a project; a luxury I can only dream of in keeping an eventual classic car.

5th April 2021, 13:00	#35
PMAN01 Happy to waft not race thanks! Join Date: Feb 2010 Posts: 191 Thanks: 196 Thanked 21 Times in 14 Posts	Well, there’s a gift horse! I do like ‘try before you buy’; at least a temporary swap would (likely) rule out the UBP as the source of my chagrins. Happy to go ahead and pay postage to me so I guess a pm with addresses etc is the next step. Publicly, thank you very much for the offer; if I could try it for a month or two and see how it goes. The prob should surface again in that time.

5th April 2021, 20:07	#37
MarkS Gets stuck in Rover 75 Diesel Tourer, called Perseverance Join Date: Nov 2011 Location: Bournemouth Posts: 664 Thanks: 189 Thanked 157 Times in 108 Posts	Have you tried TOAF ? See what the car has to say about the intermittent fault.

7th April 2021, 18:46	#39
PMAN01 Happy to waft not race thanks! Join Date: Feb 2010 Posts: 191 Thanks: 196 Thanked 21 Times in 14 Posts	Well I declare; we have 3 pumps on these cars. Live and learn! As it turns out, Lee T came over from Crosby and in the freezing wind howling up the driveway, I watched as he replaced the newish (leaking!) Magneti Marelli UPB with his Pierburg. He then wanted to satisfy his curious thought that he had the night before re: high mileage I mentioned (nearly 250k) and saw to testing the injectors. Low and behold, 1 and 3 were ok-ish, 2 was dry and fine but 4 spurted fuel. Seemingly it miserably failed the leak back test! Long story short, replaced the injector and we both (after he explained, he’s good at that, about fuel leak back) seem to think it was that all along. Sporadically the check engine light flashed up over the last year or so and this can indicate a failing injector. I’ll report back here of course but for now it’s a waiting game and the usual fingers crossed that a stall doesn’t occur.