in tank pump

3disco · 5th September 2013, 20:01

I have just replaced the intank fuel pump on my 75 cdti tourer as its not been working for several years and wondered that if the intank pump is just for transferring fuel from one side of the tank to the other and the underbonnet pump sucks fuel from the tank for delivery to the hp pump what feeds the hp pump when the underbonnet pump was deleted on the later models,what am I missing? thanks in advance.

danbax · 5th September 2013, 20:17

Quote:

Originally Posted by 3disco

I have just replaced the intank fuel pump on my 75 cdti tourer as its not been working for several years and wondered that if the intank pump is just for transferring fuel from one side of the tank to the other and the underbonnet pump sucks fuel from the tank for delivery to the hp pump what feeds the hp pump when the underbonnet pump was deleted on the later models,what am I missing? thanks in advance.

as far as im aware that is all its for had same problem put a bmw 525 one in mione with slight mod

ignore me lol this beers good

bubs · 5th September 2013, 20:52

I thought it was the in-tank pump that was deleted on later models not the under bonnet one.

Thomas · 5th September 2013, 20:53

Nope was the underbonnet ones, replaced with a far more powerful in tank pump rendering the underbonet one obsolete.

bubs · 6th September 2013, 06:19

Quote:

Originally Posted by Thomas

Nope was the underbonnet ones, replaced with a far more powerful in tank pump rendering the underbonet one obsolete.

Doh, i actually remember considering this when my in tank pump went.

Mike Noc · 5th September 2013, 21:14

Quote:

Originally Posted by 3disco

I have just replaced the intank fuel pump on my 75 cdti tourer as its not been working for several years and wondered that if the intank pump is just for transferring fuel from one side of the tank to the other and the underbonnet pump sucks fuel from the tank for delivery to the hp pump what feeds the hp pump when the underbonnet pump was deleted on the later models,what am I missing? thanks in advance.

If all the ITP did was keep the levels equal on each side of the saddle tank then they wouldn't have fitted them in the Freelander TD4's as they don't have saddle tanks.

3disco · 6th September 2013, 08:56

Quote:

Originally Posted by Mike Noc

If all the ITP did was keep the levels equal on each side of the saddle tank then they wouldn't have fitted them in the Freelander TD4's as they don't have saddle tanks.

Can you explain how the pump does both jobs as I do not see a physical connection to the outlet?

Billy1mate · 6th September 2013, 09:20

The ITP has to pump fuel to the UBP because if the ITP is duff the car will not run if the tank is less than 1/4 full.

3disco · 6th September 2013, 09:46

Quote:

Originally Posted by Billy1mate

The ITP has to pump fuel to the UBP because if the ITP is duff the car will not run if the tank is less than 1/4 full.

But if all it does is send the fuel from one side of the tank to the other how does it compromise the ubp if not working and fuel kept above a 1/4 of a tank my itp has not been working for several years,the later cars do not have an ubp so how is the fuel delivered to the high pressure pump?

James.uk · 6th September 2013, 11:02

Hi Ian, I seem to recall Jules saying much the same thing, in that the in tank pump only kept the tank fuel level, but didn't send much fuel to the under bonnet one..

Logically if you upped the power on the ITPump, with an "out" feed, you could do away with the lil under bonnet one....

My lil ZX only has one pump and manages very nicely innit...

...

5th September 2013, 20:01	#1
3disco 3disco ROVER 75 CONN TOURER CDTI and ZTT V8 SE LPG Join Date: Sep 2008 Location: chardstock.axminster,devon Posts: 1,494 Thanks: 361 Thanked 94 Times in 85 Posts	in tank pump I have just replaced the intank fuel pump on my 75 cdti tourer as its not been working for several years and wondered that if the intank pump is just for transferring fuel from one side of the tank to the other and the underbonnet pump sucks fuel from the tank for delivery to the hp pump what feeds the hp pump when the underbonnet pump was deleted on the later models,what am I missing? thanks in advance.

5th September 2013, 20:53	#4
Thomas This is my second home MG6 1.8T GT SE Join Date: Mar 2009 Location: Falkirk Posts: 9,510 Thanks: 106 Thanked 173 Times in 128 Posts	Nope was the underbonnet ones, replaced with a far more powerful in tank pump rendering the underbonet one obsolete. __________________ MG6 1.8 TCi in Artic White 1975 Land Rover Series 3

5th September 2013, 20:52	#3
bubs Posted a thing or two ROVER 75 Join Date: Oct 2012 Location: Canvey Island, Essex Posts: 1,651 Thanks: 43 Thanked 163 Times in 134 Posts	I thought it was the in-tank pump that was deleted on later models not the under bonnet one.

6th September 2013, 09:20	#8
Billy1mate Posted a thing or two 120d M Sport Join Date: Feb 2012 Location: Sunny Weymouth Posts: 1,815 Thanks: 153 Thanked 142 Times in 121 Posts	The ITP has to pump fuel to the UBP because if the ITP is duff the car will not run if the tank is less than 1/4 full.

6th September 2013, 11:02	#10
James.uk Passed Away 2002 Pale Blue. Rover 75 CDTi Connoisseur auto. 170K miles Join Date: Dec 2008 Location: Near the M67. Posts: 14,509 Thanks: 199 Thanked 585 Times in 397 Posts	Hi Ian, I seem to recall Jules saying much the same thing, in that the in tank pump only kept the tank fuel level, but didn't send much fuel to the under bonnet one.. Logically if you upped the power on the ITPump, with an "out" feed, you could do away with the lil under bonnet one.... My lil ZX only has one pump and manages very nicely innit... ...