Diesel fuel pumps

e30325itourer · 9th January 2018, 07:24

Is there a difference in fuel pumps between the early model and facelift, my observations from looking at the top is the early one has a spout that’s straight and the later one has the same spout, but at an angle.

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Lee T · 9th January 2018, 11:25

Hi, Main difference is mk1 has 2 pumps, In tank and under bonnet. Mk 2 has a single in tank pump. Early versions should be listed as 1999-2004. There are traders here that sell both and will be able to ensure you get correct version. D.M.G.R.S or JULES are two I'm sure have them. Lee

Ennine · 9th January 2018, 11:59

A large number of MK2s (as in facelifts)have two pumps.

Nige

NigelOBB · 9th January 2018, 13:26

Quote:

Originally Posted by Ennine

A large number of MK2s (as in facelifts)have two pumps.

Nige

That’s right I’ve seen a 06 Club with 2..

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Mickyboy · 9th January 2018, 16:45

It’s not the date of registration that has any effect on whether it is a two pump or one pump system but the build date,
Lots of Mark2 facelift models are still two pump

Mark1 fuel pressure tends to be around 3.7 bar
Mark2 single pump systems should be 4 bar
Mick

marinabrian · 9th January 2018, 17:41

It is very specific which cars are fitted what fuel system layout, cars from 5D332301 are single pump cars, every diesel car prior to this are twin pump.

It's all about VIN, and not date of registration

Brian

philm · 9th January 2018, 17:43

A few comments but nobody has actually answered the question the op was asking

marinabrian · 9th January 2018, 17:51

Quote:

Originally Posted by philm

A few comments but nobody has actually answered the question the op was asking

Ok then, the in tank pump fitted the early cars have no internal pressure relief valve, and the swirl pot pick up is grey, and on single pump cars there is a pressure relief valve set at 420 Kpa, and the swirl pot pick up is light blue.

Also the left hand side sender unit is different, along with the cross tank pipework.

The underfloor pipework is completely different of course, and the pressure regulator on the high pressure fuel pump is different.

Does that clarify things slightly more?

Brian

Mickyboy · 9th January 2018, 18:09

Quote:

Originally Posted by marinabrian

Ok then, the in tank pump fitted the early cars have no internal pressure relief valve, and the swirl pot pick up is grey, and on single pump cars there is a pressure relief valve set at 420 Kpa, and the swirl pot pick up is light blue.

Also the left hand side sender unit is different, along with the cross tank pipework.

The underfloor pipework is completely different of course, and the pressure regulator on the high pressure fuel pump is different.

Does that clarify things slightly more?

Brian

Brilliant description Brian, definitely the best description I ever heard clear and concise.
The pressure relief valve is set at 420 kilopascal and you often find single pump systems maintaining 400 kilopascal at idle, but twin pump systems can’t produce these figures. Single pumps have a much longer life span too
Mick

Mike Noc · 9th January 2018, 18:24

Quote:

Originally Posted by marinabrian

Ok then, the in tank pump fitted the early cars have no internal pressure relief valve, and the swirl pot pick up is grey, and on single pump cars there is a pressure relief valve set at 420 Kpa, and the swirl pot pick up is light blue.

Brian

When I stripped my early ITP down there were two valves on top Brian, each had a ball in it but only one had a spring.

The floating ball is the self priming valve, which is normally open, and closes once the pump has flooded with diesel and pressurised the fuel line, and the spring loaded normally closed valve looks like it is there for pressure relief.

Interestingly, the priming valve is the reason for the quarter tank syndrome when the ITP fails - once the level drops to the top of the ITP, the UBP sucks air through the priming valve and it is Goodnight Vienna.

Quote:

Originally Posted by e30325itourer

Is there a difference in fuel pumps between the early model and facelift, my observations from looking at the top is the early one has a spout that’s straight and the later one has the same spout, but at an angle.

Exactly which fuel pump do you mean? I have a choice of 4 on my car.

.

9th January 2018, 07:24	#1
e30325itourer Loves to post mgztt190/bmw e30 325i tourer Join Date: Sep 2015 Location: Ballyclare Posts: 316 Thanks: 50 Thanked 50 Times in 41 Posts	Diesel fuel pumps Is there a difference in fuel pumps between the early model and facelift, my observations from looking at the top is the early one has a spout that’s straight and the later one has the same spout, but at an angle. Sent from my iPhone using Tapatalk __________________ My MGZTT This vehicle was the 2,432nd ZT-T to run off the production line, out of 8,249 This vehicle was the 847th ZT-T 190 + to be made out of 1,756 This vehicle was the 100th ZT-T in Starlight Silver (code: MBB) to be made out of 1,134 Starlight Silver ZT-Ts

9th January 2018, 11:25	#2
Lee T Gets stuck in MG ZT Join Date: Jul 2014 Location: Liverpool Posts: 850 Thanks: 180 Thanked 248 Times in 189 Posts	Hi, Main difference is mk1 has 2 pumps, In tank and under bonnet. Mk 2 has a single in tank pump. Early versions should be listed as 1999-2004. There are traders here that sell both and will be able to ensure you get correct version. D.M.G.R.S or JULES are two I'm sure have them. Lee __________________ [SIGPIC][/SIGPIC]

9th January 2018, 11:59	#3
Ennine Posted a thing or two Ford Join Date: Nov 2012 Location: Portmahomack Posts: 1,330 Thanks: 545 Thanked 317 Times in 193 Posts	A large number of MK2s (as in facelifts)have two pumps. Nige __________________ Ni9e How to: Replace touch screen Navall II [SIGPIC][/SIGPIC]

9th January 2018, 16:45	#5
Mickyboy SERVICING AND DEALER DIAGNOSTICS MG ZT CDTI 135 + & MGZT CDTI AUTO 160 & ROVER 75 TOURER CDTI 160 TROPHY YELLOW Join Date: Aug 2013 Location: Hernebay Posts: 4,331 Thanks: 818 Thanked 2,414 Times in 1,141 Posts	It’s not the date of registration that has any effect on whether it is a two pump or one pump system but the build date, Lots of Mark2 facelift models are still two pump Mark1 fuel pressure tends to be around 3.7 bar Mark2 single pump systems should be 4 bar Mick __________________ [SIGPIC][/SIGPIC] T4 Owner Jobs done : new UBP, Spy hole mod, Rear hub(wheel bearing),plenum cleaned and emptied, Inline thermostat fitted,Full service, In car Digital tv/DVD Bluetooth Satnav etc, Replaced UBP, Restored headlights,Fixed airbag connection.replaced HP pump,replaced rear light seals,changed intercooler O rings. Jobs to do: ,replace drivers lock,.[/SIZE]

9th January 2018, 17:43	#7
philm Loves to post rover 75 tourer Join Date: Jan 2017 Location: HEREFORD Posts: 269 Thanks: 7 Thanked 69 Times in 56 Posts	A few comments but nobody has actually answered the question the op was asking __________________ Free Toaf & Delphi diagnostics.

9th January 2018, 17:41	#6
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	It is very specific which cars are fitted what fuel system layout, cars from 5D332301 are single pump cars, every diesel car prior to this are twin pump. It's all about VIN, and not date of registration Brian