Engine: 70 T5: - Fuel Pump problem

DavidLewis · Jun 19th, 2019, 16:31

1999 V70 2.3 T5 Petrol

I am having to crank the engine quite a bit to start it. Worse if the engine is still warm. Worse on a hot day.

When I turn the ignition to position II I have checked there are volts to the fuel pump, but the volts are only there for a small fraction of a second. Blink and you literally do miss it. I think it should be long enough to pressurise the rail ? I have a spare fuel pump relay but changing the relay makes no difference.

Very occasionally the volts are there noticeably longer with the ignition at position II and the engine starts quite quickly on these occasions.

Your thoughts please.

Regards
David

volvo again · Jun 19th, 2019, 16:36

Had a similar problem with my old '94 850 T5, would take ages to start when hot, turned out to be the temperature sensor...
Maybe worth checking?

SteveSarre · Jun 19th, 2019, 17:53

Hi David

When you turn the ignition on, the fuel pump will buzz slightly as it pressurises the system.
That takes only a couple of seconds, then the fuel pump turns off.
You can hear it most easily if you listen near the spare tyre, with the cargo boards lifted.

That's normal.

So maybe there is another problem that makes it difficult to start.

Does the temperature showing on the gauge match what you would expect?

Steve

DavidLewis · Jun 24th, 2019, 18:10

Steve

The pump runs for a fraction of a second so it cannot pressurise in that time. If I turn the ignition on and off 3 or 4 times to position II it starts much easier ie I have run the pump for a fraction of a second 3 or 4 times.

On my previous V70 I could hear the pump run for 3 or 4 secs every time I turned the key and it was a very quick starter.

How do I get the pump to run for 2 or 3 secs when I turn to position II like it should ?

Thanks.

Luxobarge · Jun 24th, 2019, 22:34

Fuel pump relay?

SwedishBus · Jun 24th, 2019, 23:03

Quote:

Originally Posted by Luxobarge

Fuel pump relay?

Most likely of all. A common failure-point of the 850R's, certainly, and I'm certain this has a similar relay on the T5R?

If the fuel pressure seems good during normal running, then it rules most other things out.

DavidLewis · Jun 25th, 2019, 07:56

I have a spare fuel pump relay and swapping the relay makes no difference.

SteveSarre · Jun 25th, 2019, 08:40

Hi David

Just before and after you try to start, can you test the fuel pressure at the injector rail?
Ideally measure the pressure with a gauge, or just release the schrader valve and check that fuel squirts out (catch it in something to avoid spraying fuel everywhere).

Other than the starting problem, does the engine run normally?

Does the temperature gauge work as it should?

Possible useful link
https://www.matthewsvolvosite.com/fo...ic.php?t=88046

Steve

DavidLewis · Jun 27th, 2019, 17:25

Hi Steve

Once started the engine runs normally.

As others have suggested I have tried to look at the temperature sensor but cannot see it. It is impossible to see anything around the thermostat with all the pipework there is in the way. I thought I would also look at the RPM sensor (made a big difference to the smoothness of the engine when I cleaned it on my old V70 SE) and camshaft sensor connectors.

However the 2.3T5 looks nothing like the Haynes manual. Pointers as to where they are on the 2.3T5 would be a help.

Thank you for the link - similar to what I experience. So I`ll look at the fuel pump as well.

Thank you.

DavidLewis · Jun 27th, 2019, 18:06

Forgot to say - temperature gauge is fine.

Jun 19th, 2019, 16:31	#1
DavidLewis Junior Member Last Online: Apr 1st, 2024 12:45 Join Date: Oct 2011 Location: Berkhamsted	Fuel Pump problem 1999 V70 2.3 T5 Petrol I am having to crank the engine quite a bit to start it. Worse if the engine is still warm. Worse on a hot day. When I turn the ignition to position II I have checked there are volts to the fuel pump, but the volts are only there for a small fraction of a second. Blink and you literally do miss it. I think it should be long enough to pressurise the rail ? I have a spare fuel pump relay but changing the relay makes no difference. Very occasionally the volts are there noticeably longer with the ignition at position II and the engine starts quite quickly on these occasions. Your thoughts please. Regards David __________________ David Lewis 1999 V70 2.3 T5 Silver

Jun 19th, 2019, 17:53	#3
SteveSarre Premier Member Last Online: Today 15:47 Join Date: Oct 2004 Location: London/West Country	Hi David When you turn the ignition on, the fuel pump will buzz slightly as it pressurises the system. That takes only a couple of seconds, then the fuel pump turns off. You can hear it most easily if you listen near the spare tyre, with the cargo boards lifted. That's normal. So maybe there is another problem that makes it difficult to start. Does the temperature showing on the gauge match what you would expect? Steve __________________ V70 2.5 Turbo AWD Man. 1999 Red V70 2.5 10V Auto 1998 Green C70 T 20V Auto Conv. 2001 Blue, C70 T5 Auto Conv. 2000 Blue V70 2.5 Turbo AWD Auto 1998 Green, V70 2.5 10V Auto BiFuel 1999 Red (scrapped) V70 20v Auto 1999 Green (scrapped)

Jun 24th, 2019, 18:10	#4
DavidLewis Junior Member Last Online: Apr 1st, 2024 12:45 Join Date: Oct 2011 Location: Berkhamsted	Steve The pump runs for a fraction of a second so it cannot pressurise in that time. If I turn the ignition on and off 3 or 4 times to position II it starts much easier ie I have run the pump for a fraction of a second 3 or 4 times. On my previous V70 I could hear the pump run for 3 or 4 secs every time I turned the key and it was a very quick starter. How do I get the pump to run for 2 or 3 secs when I turn to position II like it should ? Thanks. __________________ David Lewis 1999 V70 2.3 T5 Silver

Jun 24th, 2019, 22:34	#5
Luxobarge Premier Member Last Online: Today 14:53 Join Date: Jan 2011 Location: Horne (Nr. Horley)	Fuel pump relay? __________________ Some people are like Slinkies, they serve no useful purpose but they still bring a smile to your face when you push them downstairs.

Jun 25th, 2019, 07:56	#7
DavidLewis Junior Member Last Online: Apr 1st, 2024 12:45 Join Date: Oct 2011 Location: Berkhamsted	I have a spare fuel pump relay and swapping the relay makes no difference. __________________ David Lewis 1999 V70 2.3 T5 Silver

Jun 19th, 2019, 16:36	#2
volvo again Master Member Last Online: Today 17:46 Join Date: Jun 2018 Location: Presteigne, mid Wales	Had a similar problem with my old '94 850 T5, would take ages to start when hot, turned out to be the temperature sensor... Maybe worth checking?

Jun 25th, 2019, 08:40	#8
SteveSarre Premier Member Last Online: Today 15:47 Join Date: Oct 2004 Location: London/West Country	Hi David Just before and after you try to start, can you test the fuel pressure at the injector rail? Ideally measure the pressure with a gauge, or just release the schrader valve and check that fuel squirts out (catch it in something to avoid spraying fuel everywhere). Other than the starting problem, does the engine run normally? Does the temperature gauge work as it should? Possible useful link https://www.matthewsvolvosite.com/fo...ic.php?t=88046 Steve __________________ V70 2.5 Turbo AWD Man. 1999 Red V70 2.5 10V Auto 1998 Green C70 T 20V Auto Conv. 2001 Blue, C70 T5 Auto Conv. 2000 Blue V70 2.5 Turbo AWD Auto 1998 Green, V70 2.5 10V Auto BiFuel 1999 Red (scrapped) V70 20v Auto 1999 Green (scrapped) Last edited by SteveSarre; Jun 25th, 2019 at 08:43.

Jun 27th, 2019, 17:25	#9
DavidLewis Junior Member Last Online: Apr 1st, 2024 12:45 Join Date: Oct 2011 Location: Berkhamsted	Hi Steve Once started the engine runs normally. As others have suggested I have tried to look at the temperature sensor but cannot see it. It is impossible to see anything around the thermostat with all the pipework there is in the way. I thought I would also look at the RPM sensor (made a big difference to the smoothness of the engine when I cleaned it on my old V70 SE) and camshaft sensor connectors. However the 2.3T5 looks nothing like the Haynes manual. Pointers as to where they are on the 2.3T5 would be a help. Thank you for the link - similar to what I experience. So I`ll look at the fuel pump as well. Thank you. __________________ David Lewis 1999 V70 2.3 T5 Silver

Jun 27th, 2019, 18:06	#10
DavidLewis Junior Member Last Online: Apr 1st, 2024 12:45 Join Date: Oct 2011 Location: Berkhamsted	Forgot to say - temperature gauge is fine. __________________ David Lewis 1999 V70 2.3 T5 Silver

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