Under Bonnet Fuel Pump

ardvark · 11th April 2021, 15:39

Car ran ok this morning.
This after didn't start.
Lifted the bonnet and moved some wires.
After messing with the fuel pump wires it started to hum.
Car started ok no problem.
Question.
Is the pump on it's way out?
OR
Is it just the wire needed moving a bit?

Mike Noc · 11th April 2021, 16:27

Clean the plug contacts and then if it happens again check you have 12v at the plug, and if you do the pump is buying the farm.

Not unknown for cables to break, but more likely the pump commutator brushes are worn and it needs a tap to get it started.

COLVERT · 11th April 2021, 16:44

You wouldn't think the brushes would wear as they run submerged in diesel all the time.---

ardvark · 11th April 2021, 16:55

So it is more lightly to be the contact connection than the pump itself?

Arctic · 11th April 2021, 21:15

Quote:

Originally Posted by ardvark

So it is more lightly to be the contact connection than the pump itself?

Could be as above clean contacts with contact cleaner only, then put a glob of
vaseline into the plug push fully home, also you could add some extra electrical tape tape to the wiring going to the plug to make them more stable, just in case there is an air line crack in of the wires.

Keep an eye on it and if it happens again the pump is on it's way out, only fit a pierburg pump or a good known used one, after market pumps do not last.

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Mike Noc · 11th April 2021, 21:49

Quote:

Originally Posted by COLVERT

You wouldn't think the brushes would wear as they run submerged in diesel all the time.---

I haven't had a UBP apart to determine why they fail Jon - with the ITPs it isn't the brushes but the commutator itself that wears down to the bone.
Common for a failing UBP to come to life with a tap or two, which suggests a poor contact between the commutator and brushes either way.

trikey · 12th April 2021, 06:20

I’d say it’s the pump that’s on the way out, never seen one last very long if it’s starting to stick.

Sent from my iPhone using Tapatalk

ardvark · 4th May 2021, 04:07

It happened again last night. Lifted the bonnet tapped the pump and away we went on our way.
Any idea how long I will get away with tapping it to start before it gives up altogether?
Also who or where would be the best place to get a good fuel pump from?

trikey · 4th May 2021, 04:48

There is no answer as to how long it will last, if it’s failing then get a replacement before you get stranded somewhere.

Rimmer bros have them in stock, beware of cheaper ones on eBay hat don’t last 5 mins.

11th April 2021, 15:39	#1
ardvark Al 75 CDTI Tourer Auto Join Date: Mar 2009 Location: Studley Posts: 1,457 Thanks: 1 Thanked 69 Times in 48 Posts	Under Bonnet Fuel Pump Car ran ok this morning. This after didn't start. Lifted the bonnet and moved some wires. After messing with the fuel pump wires it started to hum. Car started ok no problem. Question. Is the pump on it's way out? OR Is it just the wire needed moving a bit? __________________ ARDVARK

11th April 2021, 16:55	#4
ardvark Al 75 CDTI Tourer Auto Join Date: Mar 2009 Location: Studley Posts: 1,457 Thanks: 1 Thanked 69 Times in 48 Posts	So it is more lightly to be the contact connection than the pump itself? __________________ ARDVARK

12th April 2021, 06:20	#7
trikey Premium Trader Rover 75 Join Date: Nov 2010 Location: Devon Posts: 33,760 Thanks: 8,837 Thanked 14,831 Times in 8,030 Posts	I’d say it’s the pump that’s on the way out, never seen one last very long if it’s starting to stick. Sent from my iPhone using Tapatalk __________________ Lest we forget..

4th May 2021, 04:07	#8
ardvark Al 75 CDTI Tourer Auto Join Date: Mar 2009 Location: Studley Posts: 1,457 Thanks: 1 Thanked 69 Times in 48 Posts	It happened again last night. Lifted the bonnet tapped the pump and away we went on our way. Any idea how long I will get away with tapping it to start before it gives up altogether? Also who or where would be the best place to get a good fuel pump from? __________________ ARDVARK Last edited by ardvark; 4th May 2021 at 04:35..

4th May 2021, 04:48	#9
trikey Premium Trader Rover 75 Join Date: Nov 2010 Location: Devon Posts: 33,760 Thanks: 8,837 Thanked 14,831 Times in 8,030 Posts	There is no answer as to how long it will last, if it’s failing then get a replacement before you get stranded somewhere. Rimmer bros have them in stock, beware of cheaper ones on eBay hat don’t last 5 mins. __________________ Lest we forget..

11th April 2021, 16:27	#2
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	Clean the plug contacts and then if it happens again check you have 12v at the plug, and if you do the pump is buying the farm. Not unknown for cables to break, but more likely the pump commutator brushes are worn and it needs a tap to get it started.

11th April 2021, 16:44	#3
COLVERT This is my second home R75 Saloon. Join Date: Feb 2009 Location: France/or Devon. Posts: 14,003 Thanks: 3,851 Thanked 2,167 Times in 1,816 Posts	You wouldn't think the brushes would wear as they run submerged in diesel all the time.---

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