Both fuel pumps not working!

kamylion · 18th January 2015, 14:41

Hello all,

My 2002 mg zt-t cdti has been running well until now.
It doesn't start and i cant hear neither of the pumps (ubp and itp)
What could it be?

Both pumps were done and all injectors refurbished last year.

The ecu hasn't any signs of water damage.
Is there a fuse or relay for the pumps I can check.
Just bought a multimeter but not sure how to use it as there's no instructions.

Any help much appreciated.

Have now realised itp is working but ubp isn't.

ninaandphil · 18th January 2015, 15:22

When you say you can't hear the pumps running, have you lifted up the rear passenger seat, drivers side, and had a good listen? When you turn the ignition on you should hear it running easily until it has primed the system a few secs later.....
The front one is much quieter, I can't hear mine on my cdti, to check it's running and sending fuel to the rails, you can unclip the fuel pipe, rail side, put some rags under, and turn on the ignition, fuel should be pumped through.
If no noise from the rear pump, then it's most likely failed.
My rear pump failed recently, but I changed both, as if the rear fails, the front can keep the engine going for a while if there's sufficient fuel in the tank and it can lift it, put it puts a strain on the UBP and can trigger it to fail as well...
Good luck, many experts on here can advise, I'm an amateur!
Phil

klarzy · 18th January 2015, 15:24

Fuse 28 (30A)
Relay 103

both in passenger fuse box

Mike Noc · 18th January 2015, 15:44

Does the oil light come on with key to position II before you start cranking the engine?

marinabrian · 18th January 2015, 15:52

Have a look HERE

Failing that, I can test/repair your ECM.

Let me know how you get on

Brian

kamylion · 18th January 2015, 17:00

Sorry to be a pain but turns out the in tank pump is humming away and ubp is defo not. tried listening to itp through filler cap because work tools were on back but have just moved it all and can hear it.

Fuse 28 was for the horn, can't see relay 103.

Just had RAC out and they said it was one of 2 things, either the rail pressure sensor or high pressure pump.
He said hope its the sensor or it'll be very costly

He had his computer hooked up showing there was no presure in the system, Does that all sound right?

Greeners · 18th January 2015, 17:02

you need to check you've got 12v at the UBP....

klarzy · 18th January 2015, 17:02

Quote:

Originally Posted by kamylion

Sorry to be a pain but turns out the in tank pump is humming away and ubp is defo not. tried listening to itp through filler cap because work tools were on back but have just moved it all and can here it.

Fuse 28 was for the horn, can't see relay 103.

Just had RAC out and they said it was one of 2 things, either the rail pressure sensor or high pressure pump.
He said hope its the sensor or it'll be very costly

He had his computer hooked up showing there was no presure in the system, Does that all sound right?

pull the plug out of the UBP a couple of times and see if it kicks in to life...

maybe just a bad connection...

there would be no high pressure if the engine is not running, the high pressure pump is driven by the engine...??

kamylion · 18th January 2015, 17:06

Oh......

Ok I'll go jiggle the plug about a mo,ta.

kamylion · 18th January 2015, 17:20

Just had another poke and prod but still no joy

18th January 2015, 14:41	#1
kamylion Regular poster MG ZT-T 135+ Join Date: Feb 2013 Location: weston-super-mare Posts: 71 Thanks: 2 Thanked 4 Times in 4 Posts	Both fuel pumps not working! Hello all, My 2002 mg zt-t cdti has been running well until now. It doesn't start and i cant hear neither of the pumps (ubp and itp) What could it be? Both pumps were done and all injectors refurbished last year. The ecu hasn't any signs of water damage. Is there a fuse or relay for the pumps I can check. Just bought a multimeter but not sure how to use it as there's no instructions. Any help much appreciated. Have now realised itp is working but ubp isn't. Last edited by kamylion; 18th January 2015 at 20:11..

18th January 2015, 15:24	#3
klarzy This is my second home none but not gone Join Date: Mar 2013 Location: March, Cambs Posts: 16,437 Thanks: 894 Thanked 4,247 Times in 3,025 Posts	Fuse 28 (30A) Relay 103 both in passenger fuse box __________________ [SIGPIC][/SIGPIC]….All praise Bananaswan….

18th January 2015, 17:02	#7
Greeners Moderator MG-ZTT Join Date: Mar 2007 Location: Ware, Herts Posts: 19,798 Thanks: 161 Thanked 1,249 Times in 1,036 Posts	you need to check you've got 12v at the UBP.... __________________ *David* Impecunity is the mother of ingenuity Useful how to's for common problems Car Of The Month Jan 2014 [SatNav Power Down] [Coolant Level] [SatNav Repair] [Diesel Non Starting] [Paint Codes] [Rear Light Seals] [Reversing Light Switch] [Bleeding Brakes][Sunroof Drain] [Early ZT's][Instrument Pack Diagnostics][ATC Diagnostics]

18th January 2015, 15:22	#2
ninaandphil Avid contributor MG ZT CDTi Join Date: May 2013 Location: Exford Posts: 173 Thanks: 49 Thanked 25 Times in 20 Posts	When you say you can't hear the pumps running, have you lifted up the rear passenger seat, drivers side, and had a good listen? When you turn the ignition on you should hear it running easily until it has primed the system a few secs later..... The front one is much quieter, I can't hear mine on my cdti, to check it's running and sending fuel to the rails, you can unclip the fuel pipe, rail side, put some rags under, and turn on the ignition, fuel should be pumped through. If no noise from the rear pump, then it's most likely failed. My rear pump failed recently, but I changed both, as if the rear fails, the front can keep the engine going for a while if there's sufficient fuel in the tank and it can lift it, put it puts a strain on the UBP and can trigger it to fail as well... Good luck, many experts on here can advise, I'm an amateur! Phil

18th January 2015, 15:44	#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	Does the oil light come on with key to position II before you start cranking the engine?

18th January 2015, 15:52	#5
marinabrian MG ZT Join Date: Jan 2011 Location: Newcastle Upon Tyne Posts: 20,151 Thanks: 3,565 Thanked 10,837 Times in 5,718 Posts	Have a look HERE Failing that, I can test/repair your ECM. Let me know how you get on Brian

18th January 2015, 17:00	#6
kamylion Regular poster MG ZT-T 135+ Join Date: Feb 2013 Location: weston-super-mare Posts: 71 Thanks: 2 Thanked 4 Times in 4 Posts	Sorry to be a pain but turns out the in tank pump is humming away and ubp is defo not. tried listening to itp through filler cap because work tools were on back but have just moved it all and can hear it. Fuse 28 was for the horn, can't see relay 103. Just had RAC out and they said it was one of 2 things, either the rail pressure sensor or high pressure pump. He said hope its the sensor or it'll be very costly He had his computer hooked up showing there was no presure in the system, Does that all sound right?

18th January 2015, 17:06	#9
kamylion Regular poster MG ZT-T 135+ Join Date: Feb 2013 Location: weston-super-mare Posts: 71 Thanks: 2 Thanked 4 Times in 4 Posts	Oh...... Ok I'll go jiggle the plug about a mo,ta.

18th January 2015, 17:20	#10
kamylion Regular poster MG ZT-T 135+ Join Date: Feb 2013 Location: weston-super-mare Posts: 71 Thanks: 2 Thanked 4 Times in 4 Posts	Just had another poke and prod but still no joy