Intank fuel pump blowing 30a fuse

CrankmasterII · 6th August 2014, 16:14

Hi
My 03 2.0 diesel ZTT just stopped suddenly and wouldn't restart
Found 30a fuse blown for ghe fuel pumps
Have disconnected the intank pump and am just running on under bonnet pump at moment with full tank of fuel, so at least car is running
I have no fuel gauge due to disconnecting it
Any idea what can cause this pump to be blowing the fuse?
Does the pump just seize up when packed in and is maybe trying to draw to much current in order for it to try run?
I am going to put voltage across the pump to see if it still runs and works properly when I can get time
Also will ghe under bonnet pump be prone to failure now that it's running on its own
Thanks in advance
Willie

wuzerk · 6th August 2014, 17:01

The pumps usually just wear out and yes, running just the underbonnet on its own will shorten its life. I assume that you have more than half a tank of fuel?
Blowing fuse could be anything from a pump fault to a chafed wire.

DMGRS · 6th August 2014, 17:03

A faulty pump could well cause a fuse blow - they usually wear out due to brush erosion, however it's possible the pump could seize completely due to bearing failure - that'd likely blow the fuse.

I have both pumps:
Fuel System Components

kaiser · 6th August 2014, 17:05

Quote:

Originally Posted by CrankmasterII

Hi
My 03 2.0 diesel ZTT just stopped suddenly and wouldn't restart
Found 30a fuse blown for ghe fuel pumps
Have disconnected the intank pump and am just running on under bonnet pump at moment with full tank of fuel, so at least car is running
I have no fuel gauge due to disconnecting it
Any idea what can cause this pump to be blowing the fuse?
Does the pump just seize up when packed in and is maybe trying to draw to much current in order for it to try run?
I am going to put voltage across the pump to see if it still runs and works properly when I can get time
Also will ghe under bonnet pump be prone to failure now that it's running on its own
Thanks in advance
Willie

The pump most likely is finished. It could be seized or it could be burnt out. If you take the pump out and apply 12 V power, alternating the + and -, it can sometimes be possible to get it to run, if something has physically blocked the impeller. But chances are you need a new one.

CrankmasterII · 6th August 2014, 17:58

Cheers lads
Will check pump first make sure it's dead and not a shorted wire
Am leaning towards bad pump as it just went on me with no notice
Will report back
Thanks

CrankmasterII · 6th August 2014, 19:41

Just put 12v across pin 2 and pin 5 on the intank pump
Jammed up so must be trying to draw to many amps to get it going and blowing fuse
New pump so!

Mike Noc · 6th August 2014, 22:50

First time I've heard of this happening. I take it you do have continuity?

They usually go open circuit due to the commutators wearing down to nothing, with the brushes still looking like new.

When you replace it, and if you strip it down do post up the cause of the problem.

CrankmasterII · 9th August 2014, 15:24

Fitted second hand pump and sorted the problem
As expected jammed pump was pulling to much current trying to run it and blowing ghe fuse

6th August 2014, 16:14	#1
CrankmasterII Regular poster MG ZT-T Join Date: Dec 2013 Location: Dublin Posts: 34 Thanks: 0 Thanked 0 Times in 0 Posts	Intank fuel pump blowing 30a fuse Hi My 03 2.0 diesel ZTT just stopped suddenly and wouldn't restart Found 30a fuse blown for ghe fuel pumps Have disconnected the intank pump and am just running on under bonnet pump at moment with full tank of fuel, so at least car is running I have no fuel gauge due to disconnecting it Any idea what can cause this pump to be blowing the fuse? Does the pump just seize up when packed in and is maybe trying to draw to much current in order for it to try run? I am going to put voltage across the pump to see if it still runs and works properly when I can get time Also will ghe under bonnet pump be prone to failure now that it's running on its own Thanks in advance Willie

6th August 2014, 17:01	#2
wuzerk Passed Away Rover 75 CDT 03 auto Conn. SE Join Date: May 2009 Location: London Posts: 2,885 Thanks: 104 Thanked 254 Times in 204 Posts	Pumps The pumps usually just wear out and yes, running just the underbonnet on its own will shorten its life. I assume that you have more than half a tank of fuel? Blowing fuse could be anything from a pump fault to a chafed wire. Last edited by wuzerk; 6th August 2014 at 17:07..

6th August 2014, 17:03	#3
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	A faulty pump could well cause a fuse blow - they usually wear out due to brush erosion, however it's possible the pump could seize completely due to bearing failure - that'd likely blow the fuse. I have both pumps: Fuel System Components __________________ 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

6th August 2014, 17:58	#5
CrankmasterII Regular poster MG ZT-T Join Date: Dec 2013 Location: Dublin Posts: 34 Thanks: 0 Thanked 0 Times in 0 Posts	Cheers lads Will check pump first make sure it's dead and not a shorted wire Am leaning towards bad pump as it just went on me with no notice Will report back Thanks

6th August 2014, 19:41	#6
CrankmasterII Regular poster MG ZT-T Join Date: Dec 2013 Location: Dublin Posts: 34 Thanks: 0 Thanked 0 Times in 0 Posts	Just put 12v across pin 2 and pin 5 on the intank pump Jammed up so must be trying to draw to many amps to get it going and blowing fuse New pump so!

6th August 2014, 22:50	#7
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: 11,548 Thanks: 3,470 Thanked 3,119 Times in 2,247 Posts	First time I've heard of this happening. I take it you do have continuity? They usually go open circuit due to the commutators wearing down to nothing, with the brushes still looking like new. When you replace it, and if you strip it down do post up the cause of the problem.

9th August 2014, 15:24	#8
CrankmasterII Regular poster MG ZT-T Join Date: Dec 2013 Location: Dublin Posts: 34 Thanks: 0 Thanked 0 Times in 0 Posts	Fitted second hand pump and sorted the problem As expected jammed pump was pulling to much current trying to run it and blowing ghe fuse