Volvo V70 Bi-Fuel 2005 CNG Tank not filling up full

juke80 · Oct 5th, 2023, 19:50

CNG Tank not filling up full or there is some other problem because i need to fill up gas tank every 80-85km (4.2-5.5kg each time)
Does anyone had this same problem?

mcfe · Oct 6th, 2023, 13:04

Could it be the nozzle is clogged/damaged? Or perhaps the sensor for the fuel level is broken and in fact you have more fuel in there?

CNGBiFuel · Oct 28th, 2023, 16:00

This is a known fault. Usually one solenoid fails. Not easy to sort.

juke80 · Nov 9th, 2023, 15:19

Quote:

Originally Posted by mcfe

Could it be the nozzle is clogged/damaged? Or perhaps the sensor for the fuel level is broken and in fact you have more fuel in there?

Where is this sensor? I mean sensor for gas? is it pressure sensor or??

mcfe · Nov 23rd, 2023, 09:51

Somewhere on the main tank, under the car. Like he said, neither solenoids nor pressure sensors there are easy to get to.

muurame · Jan 3rd, 2024, 10:58

I've got a case of this too, S80 2004 factory Bi-Fuel.

The main tank is full by my reckoning according to fills and miles, the valve is a 2"GFI type, solenoid clicks when powered. 60km/4kg is about what I'm seeing so seems to just use the smaller tanks.

I'm in winter-winter, -27c this morning, -30c yesterday. The problem arose in a much milder -10 and naturally my first instinct was to thaw, but came to realize a 2 hour parking garage visit won't do. Tried steam, hot water in a bag on the tank valve (#1 for frozen door locks) but the icicles don't hurry away, how much heat is getting to the actual valve is a mystery. Getting to the fill station with a warm car/tank/valve is impossible right now.

My money is on a mechanical failure though, the gas should be clean and winter hasn't been a problem before. I'd like to try popping open the valve with a defueling tool, since the solenoid does click, and see if that gets me back on cng for the rest of the winter. The tank just expired a few months ago and I'm not sure a qualified fitter would touch it. I'd like to make sure I have a working car before I consider putting in a new tank. And time that operation for not-winter.

muurame · Jan 3rd, 2024, 13:07

Update, manual defueling is reported to ruin the solenoid valve seating and require replacement.

I think these folk are talking about the same style of valve: https://www.cngchat.com/forum/genera...bad-tank-valve

They talk about 12v opening a pilot valve which operates the main valve. I'll sit on it, wait for warmer weather and research tank replacement options. At least now I have the bolts for the cover worked loose and can take accurate measurements.

Screwing off the shut-off valves (~20mm hex with 4.5mm allen key in center) and applying heat and penetrating oil is of course a job for a qualified cng technician.

Oct 28th, 2023, 16:00	#3
CNGBiFuel Classic P80 1999 BiFuel Last Online: Jul 17th, 2024 11:31 Join Date: Aug 2012 Location: 48mph Middle Lane M4	This is a known fault. Usually one solenoid fails. Not easy to sort. __________________ Bifuel V70 Classic 1999 [The Old Grumpy in the Corner, "When I was a lad... blah, bl**dy blah."]

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Oct 5th, 2023, 19:50	#1
juke80 New Member Last Online: Nov 14th, 2023 19:09 Join Date: Oct 2023 Location: Joensuu	Volvo V70 Bi-Fuel 2005 CNG Tank not filling up full CNG Tank not filling up full or there is some other problem because i need to fill up gas tank every 80-85km (4.2-5.5kg each time) Does anyone had this same problem?

Oct 6th, 2023, 13:04	#2
mcfe Junior Member Last Online: Aug 24th, 2024 19:49 Join Date: Apr 2019 Location: NoTown	Could it be the nozzle is clogged/damaged? Or perhaps the sensor for the fuel level is broken and in fact you have more fuel in there?

Nov 23rd, 2023, 09:51	#5
mcfe Junior Member Last Online: Aug 24th, 2024 19:49 Join Date: Apr 2019 Location: NoTown	Somewhere on the main tank, under the car. Like he said, neither solenoids nor pressure sensors there are easy to get to.

Jan 3rd, 2024, 10:58	#6
muurame New Member Last Online: Jan 26th, 2024 08:22 Join Date: Jan 2024 Location: Muurame	I've got a case of this too, S80 2004 factory Bi-Fuel. The main tank is full by my reckoning according to fills and miles, the valve is a 2"GFI type, solenoid clicks when powered. 60km/4kg is about what I'm seeing so seems to just use the smaller tanks. I'm in winter-winter, -27c this morning, -30c yesterday. The problem arose in a much milder -10 and naturally my first instinct was to thaw, but came to realize a 2 hour parking garage visit won't do. Tried steam, hot water in a bag on the tank valve (#1 for frozen door locks) but the icicles don't hurry away, how much heat is getting to the actual valve is a mystery. Getting to the fill station with a warm car/tank/valve is impossible right now. My money is on a mechanical failure though, the gas should be clean and winter hasn't been a problem before. I'd like to try popping open the valve with a defueling tool, since the solenoid does click, and see if that gets me back on cng for the rest of the winter. The tank just expired a few months ago and I'm not sure a qualified fitter would touch it. I'd like to make sure I have a working car before I consider putting in a new tank. And time that operation for not-winter.

Jan 3rd, 2024, 13:07	#7
muurame New Member Last Online: Jan 26th, 2024 08:22 Join Date: Jan 2024 Location: Muurame	Update, manual defueling is reported to ruin the solenoid valve seating and require replacement. I think these folk are talking about the same style of valve: https://www.cngchat.com/forum/genera...bad-tank-valve They talk about 12v opening a pilot valve which operates the main valve. I'll sit on it, wait for warmer weather and research tank replacement options. At least now I have the bolts for the cover worked loose and can take accurate measurements. Screwing off the shut-off valves (~20mm hex with 4.5mm allen key in center) and applying heat and penetrating oil is of course a job for a qualified cng technician.

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