D24TIC - 760 fuel supply problem

John Davies · Aug 28th, 2009, 02:00

My 1990 760 has always liked to have a full tank of fuel - go much under 30 litres and it will hardly pull, and fits and starts abominably.

As it needed a new engine (old one was totally knackered) I have built and intalled one, with a different injector pump and thought this would sort out all running problems. It has - except this one!

As far as I am aware there is no in tank pump on the diesel 740 and 760 - though failure of this in the petrols will cause this problem - so I am in the dark. There is a new engine bay filter fitted, and the fuel filler cap is fine, indeed, the problem happens without a cap on so there is no vacuum in the tank.

I will get the top off and have a look at the gauze next week; I have never seen one blocked on these, but one never knows!

Am I wrong and did some models have an in tank pump on the diesels as well?

Any other ideas?

Regards

John D

oman5 · Aug 28th, 2009, 05:32

I think the fuel pickup pipe in the tank is cracked/split, allowing air into the fuel line. when the tank's full the split will be covered.
I have a 740 td, I am pretty sure there is no in-tank pump on them

jor · Sep 2nd, 2009, 18:32

I think volvo-express was having similar problems so he might be interested to know if you have found a fix.

jor

John Davies · Sep 7th, 2009, 02:12

There is no in tank pump, and mesh etc. was o.k.. Problem is probably the injector pump not pulling through efficiently, will change it and tell you the result.

Regards

John

Aug 28th, 2009, 02:00	#1
John Davies VOC Member Last Online: Sep 26th, 2015 22:56 Join Date: Dec 2002 Location: Walsall	760 fuel supply problem My 1990 760 has always liked to have a full tank of fuel - go much under 30 litres and it will hardly pull, and fits and starts abominably. As it needed a new engine (old one was totally knackered) I have built and intalled one, with a different injector pump and thought this would sort out all running problems. It has - except this one! As far as I am aware there is no in tank pump on the diesel 740 and 760 - though failure of this in the petrols will cause this problem - so I am in the dark. There is a new engine bay filter fitted, and the fuel filler cap is fine, indeed, the problem happens without a cap on so there is no vacuum in the tank. I will get the top off and have a look at the gauze next week; I have never seen one blocked on these, but one never knows! Am I wrong and did some models have an in tank pump on the diesels as well? Any other ideas? Regards John D __________________ Volvo 760 GLE turbodiesel estate 1989 (auto). Ford Mondeo 2001 mk. 3 Ghia X petrol estate. Austin A60 Cambridge 1966 (auto) . Austin A60 Cambridge 1967 (manual) undergoing restoration.

Aug 28th, 2009, 05:32	#2
oman5 Senior Member Last Online: Oct 23rd, 2022 03:06 Join Date: Sep 2008 Location: merthyr tydfil	I think the fuel pickup pipe in the tank is cracked/split, allowing air into the fuel line. when the tank's full the split will be covered. I have a 740 td, I am pretty sure there is no in-tank pump on them Last edited by oman5; Aug 28th, 2009 at 05:38. Reason: felt like it

Sep 2nd, 2009, 18:32	#3
jor VOC 20573 Last Online: Jul 10th, 2023 22:14 Join Date: Mar 2007 Location: wembley	I think volvo-express was having similar problems so he might be interested to know if you have found a fix. jor __________________ Volvo 940 SE 1994 D24Tic. BMW C1 85 mpg

Sep 7th, 2009, 02:12	#4
John Davies VOC Member Last Online: Sep 26th, 2015 22:56 Join Date: Dec 2002 Location: Walsall	There is no in tank pump, and mesh etc. was o.k.. Problem is probably the injector pump not pulling through efficiently, will change it and tell you the result. Regards John __________________ Volvo 760 GLE turbodiesel estate 1989 (auto). Ford Mondeo 2001 mk. 3 Ghia X petrol estate. Austin A60 Cambridge 1966 (auto) . Austin A60 Cambridge 1967 (manual) undergoing restoration.

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