2007 XC90 D5 Not Starting - Diesel Flow Stops - Page 2

TruckbusUK · Dec 21st, 2021, 10:23

Quote:

Originally Posted by zakmuh

The issue here is no fuel getting to common rail, so sensor would not detect anything? Unless we are trying to read air pressure pump is building?

When I checked the flow control valve, without power its fully open, with 12v, it closes and no fuel would flow. So when keys on ECU is wouldn't activate the valve and when excess pressure is detector by sensor, ECU would then send 12v and close it.

If above is correct, then even with a faulty control valve the pump should give some fuel output?

I doubt is reading air pressure, I also thing you are correct on the operation of the flow control, so why no fuel .. any thoughts from Clan if he is following this?

zakmuh · Dec 21st, 2021, 13:41

Hi

For checking, I put the pump back to engine and did some further investigation. Fuel is flowing to pressuring chamber (if that what it is called?) and pressuring shaft is moving to the cranking. Please see below YT video:

https://www.youtube.com/watch?v=coEL9hgrVMA

Going to move the outlet side of the pump and see if fuel would get there from here...

zakmuh · Jan 12th, 2022, 16:21

SOLVED!

Car is now sorted. The issue I had was...I had not done the priming correctly, therefore there were lots of air in the fuel line. I did the key On and OFF cycle for over 20 times (as advised by Volvo) and then car started straight away.

If you remove any fuel system line (like a hose or a banjo bolt or high pressure pipe etc), it sucks air in then stops sending fuel to common rail. When you turn the key to ON (ignition on) and if you have air then you could hear fuel flowing in there inside the fuel filter housing under rear passenger seating location. So you have to prime until you hear nothing but whining noise. This is achieved by above method, ON and then OFF

Cheers

Dec 21st, 2021, 13:41	#12
zakmuh Junior Member Last Online: Apr 25th, 2022 11:15 Join Date: May 2016 Location: Nottingham	Hi For checking, I put the pump back to engine and did some further investigation. Fuel is flowing to pressuring chamber (if that what it is called?) and pressuring shaft is moving to the cranking. Please see below YT video: https://www.youtube.com/watch?v=coEL9hgrVMA Going to move the outlet side of the pump and see if fuel would get there from here... __________________ 2007 (Mk I) Volvo XC90 SE 2.4D D5 - 199,617 miles. Silver, black leather interior.

Jan 12th, 2022, 16:21	#13
zakmuh Junior Member Last Online: Apr 25th, 2022 11:15 Join Date: May 2016 Location: Nottingham	SOLVED! Car is now sorted. The issue I had was...I had not done the priming correctly, therefore there were lots of air in the fuel line. I did the key On and OFF cycle for over 20 times (as advised by Volvo) and then car started straight away. If you remove any fuel system line (like a hose or a banjo bolt or high pressure pipe etc), it sucks air in then stops sending fuel to common rail. When you turn the key to ON (ignition on) and if you have air then you could hear fuel flowing in there inside the fuel filter housing under rear passenger seating location. So you have to prime until you hear nothing but whining noise. This is achieved by above method, ON and then OFF Cheers __________________ 2007 (Mk I) Volvo XC90 SE 2.4D D5 - 199,617 miles. Silver, black leather interior.

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