B14 fuel consumption
 

I have been using my 1988 B14 343 for 6 weeks ( 1500 miles so far) whilst i do some jobs on my other car . Fuel consumption has settled down , i was only doing a few short journeys now and again ..
Firstly can you post what MPG you get/got from your B14 to confirm what i think is "normal" my other 1980 343 did just over 30 mpg .. Then in a week i will let you know what i am currently getting and why i think it is consuming that amount of fuel ..

My Spritmonitor.de records (incomplete):

1) 1978 Volvo 343DL B14.0E CVT

Best: 30.7 mpg / Worst: 20.0 mpg

http://images.spritmonitor.de/477957_45.png

2) 1982 Volvo 343DL B14.2E CVT

Best: 33.6 mpg / Worst: 24.0 mpg

http://images.spritmonitor.de/472911_45.png

Click on icons to see breakdown of figure or look up other cars. I'd expect it to be in the ballpark 25.7 - 35.3 mpg for general use, but short journeys I'd expect could pull it below 20. Do the 87- cars not have the idle solenoid cut-off relay to help out?

I used to get 250 miles on a tankful. I think that's a tad below 30mpg. But it's a carb engine, what do you expect?

With LPG I get 350 miles for £40 of fuel. Distinctly better.

I understood this little relay was to stop dieseling run-on at switch off.

On a run my cvt does just over 30mpg but never really checked what it does on short runs

Your thinking of the electro pilot jet on it's own. These go back to the early 1970s and the DAF days. Here's one on a 44:

https://c1.staticflickr.com/5/4002/4...875_z.jpg?zz=1
pilotjetelectro by macplaxton, on Flickr

They're just a solenoid and work on the basis of ignition ON - jet open. Ignition OFF - jet closed.

The fuel shut-off relay, is a RPM controlled switch, which shuts the above solenoid under certain conditions to save fuel.
https://c7.staticflickr.com/7/6235/6...0b56c843_z.jpg
fuel_cut-off_relay by macplaxton, on Flickr
https://c4.staticflickr.com/7/6239/6...afa83cd9_z.jpg
fuel_cut_off_wiring_01 by macplaxton, on Flickr

Now although the manual says MT only from 1987, the picture of the box above is from a 1989 CVT car...

https://c7.staticflickr.com/9/8176/2...6af33a4c_z.jpg
V300_FCO by macplaxton, on Flickr

All interesting stuff , good response , keep it coming please ... Those figures are about what i remember when i was working with these cars from conception until the end ..
The tank is 10 gallons by the way , so anyone should get over 300 miles to a tank easily , there is still a lot of fuel left when the light comes on .. unless you run it dry you cannot base any fuel consumption measurement by "tankfulls" .. My 1980 343 was on LPG from 1979 to 1990 .

The CVT was horrendously thirsty when it wasn't working properly .
If you never went over 60 mph and it was working properly consumption could be good .

I have a lot to say later about how to improve the fuel consumption ..

My CVT is not working correctly at all. I have disconnected teh vac pipes as the diaphrams are leaking on the CVT, the clutch is need of changing and it does not like going slow. With keeping the speed between 70 and 90 it drives about the best and consumption was ok at those speeds. Swapping the CVT for a spare I have is on my to do list

well once you get over 60 the centrifugal weights change up the gears into overdrive so that would account for that , Can you still buy diaphragms , diaphragm springs ( which break) , seals for the vacuum input pipes to the pulleys , Vacuum control valves or repair kits for the small valves in there ? And the tachometric relay ? People weld the chassis and melt the vacuum pipes which run through the members too !

You can still get the diaphragms and the springs should still be available. I stock repair kits for the vacuum valve and control relay.
As I have a complete working unit I will just swap it but will keep the old one for repair at a later date.