Motor won't start

loelly · Nov 7th, 2018, 16:32

Hi there,
I am strugeling with a weerd problem.My V40 2002 td runs like it should ,no problems but after stopping the motor one every 100 times he won't start again.Motor crancking as it should but won't start.Looking at all the conections but finding noyhing wrong.Last attempt I spray a little start pilot and it starts at half a turn from the motor and runs as it should.Stopping and restarting whitout problems,till the next x times I start it.Than all starts over again.I don't have a clue what can be the reason for it.
Any sugestion or ideas?

Baffler · Nov 9th, 2018, 13:29

Fuel filter seals allowing air past? When were they last replaced? Every new filter should have new seals in the box.

If it happens again try priming the inline bulb, mounted on the side of the fuel filter housing, until you feel resistance and then see if it starts normally.

loelly · Nov 9th, 2018, 15:22

Thanks for your remark,will check it next time the engine does not start,but even with air in the filter should te engine not even turn for a few seconds,witch it does't.There must be a tiny bit off fuell in the HP pump i guess?
I find it very odd.
Thanks Baffler

Baffler · Nov 11th, 2018, 16:34

Quote:

Originally Posted by loelly

but even with air in the filter should te engine not even turn for a few seconds,witch it does't.There must be a tiny bit off fuell in the HP pump i guess?

There's no in-tank lift pump on the X40 so if line vacuum is compromised, usually the fuel filter seals, the HP pump doesn't have sufficient vacuum to draw fuel up from the tank unlike some older types of pump. When you change the fuel filter on these you must purge all air from the inlet line hence the hand primer/bleed bulb on the side of the filter housing.

Given it only happens on occasion it could also be early signs of the HP fuel pump pressure sensor failing but changing the fuel filter is the cheapest option especially if you have no record of it being done.

loelly · Nov 12th, 2018, 08:21

Thanks Liam,
I guess it is not the fuel filter I changed it about 6000km ago( nearly a year) and the problem just came a few months ago.The HP sensor is that the on on the rear of the pump?I guess he gets his signal from the CPU so is there a signal or tension to messure?Is it just a sort off valve?I find it verry weerd.
Wim

Nov 7th, 2018, 16:32	#1
loelly Junior Member Last Online: Apr 12th, 2024 12:12 Join Date: Sep 2018 Location: Heers	Motor won't start Hi there, I am strugeling with a weerd problem.My V40 2002 td runs like it should ,no problems but after stopping the motor one every 100 times he won't start again.Motor crancking as it should but won't start.Looking at all the conections but finding noyhing wrong.Last attempt I spray a little start pilot and it starts at half a turn from the motor and runs as it should.Stopping and restarting whitout problems,till the next x times I start it.Than all starts over again.I don't have a clue what can be the reason for it. Any sugestion or ideas?

Nov 9th, 2018, 13:29	#2
Baffler Premier Member Last Online: Yesterday 19:44 Join Date: Dec 2002 Location: Co. Limerick, Ireland	Fuel filter seals allowing air past? When were they last replaced? Every new filter should have new seals in the box. If it happens again try priming the inline bulb, mounted on the side of the fuel filter housing, until you feel resistance and then see if it starts normally. __________________ Liam... '96 854 TDI SE, '99 V70 2.5D S, '05 C70 2.0T Collection, '05 S80 2.0T SE, '15 V70 D4 SE Lux Nav.

Nov 9th, 2018, 15:22	#3
loelly Junior Member Last Online: Apr 12th, 2024 12:12 Join Date: Sep 2018 Location: Heers	Thanks for your remark,will check it next time the engine does not start,but even with air in the filter should te engine not even turn for a few seconds,witch it does't.There must be a tiny bit off fuell in the HP pump i guess? I find it very odd. Thanks Baffler

Nov 12th, 2018, 08:21	#5
loelly Junior Member Last Online: Apr 12th, 2024 12:12 Join Date: Sep 2018 Location: Heers	Thanks Liam, I guess it is not the fuel filter I changed it about 6000km ago( nearly a year) and the problem just came a few months ago.The HP sensor is that the on on the rear of the pump?I guess he gets his signal from the CPU so is there a signal or tension to messure?Is it just a sort off valve?I find it verry weerd. Wim

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